oracle.test4prep.1z0-066.v2019-03-06.by.sherman · 2019-09-29 · you must propose an oracle data...

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Oracle Database 12c: Data Guard Administration


Exam A

QUESTION 1You are required to change the Data Guard Configuration protection mode from MAXPERFORMANCE to MAXAVAILABILITY using Enterprise Manager CloudControl.

Which two are true about this change? (Choose two.)

A. If the primary database cannot write its redo to at least one synchronized standby database, then the protection level remains unchanged.B. The primary database instance will remain up and running, if it cannot write redo to at least one synchronized standby database.C. Transactions will not commit until all redo data needed to recover those transactions are written to the online redo log, and to the standby redo log on at least

one synchronizes standby database.D. Fast start failover can be enabled when making the chance.E. Real time apply will be automatically turned on.

Correct Answer: BCSection: (none)Explanation

Explanation/Reference:Explanation:Maximum AvailabilityThis protection mode provides the highest level of data protection that is possible without compromising the availability of a primary database. Transactions do notcommit until all redo data needed to recover those transactions has been written to the online redo log and to at least one synchronized standby database.If the primary database cannot write its redo stream to at least one synchronized standby database, it operates as if it were in maximum performance mode topreserve primary database availability until it is again able to write its redo stream to a synchronized standby database.

References: https://docs.oracle.com/cd/B28359_01/server.111/b28294/protection.htm

QUESTION 2Which four database parameters might be affected by or influence the creation of standby databases? (Choose four.)

A. DB_NAMEB. ARCHIVE_LAG_TARGETC. COMPATIBLED. DB_FILE_NAME_CONVERTE. DB_UNIQUE_NAMEF. FAL_SERVER


G. STANDBY_ARCHIVE_DEST

Correct Answer: ADEFSection: (none)Explanation

Explanation/Reference:Explanation:A: DB_NAMEOn a primary database, specify the name used when the database was created. On a physical standby database, use the DB_NAME of the primary database.

C: Ensure the COMPATIBLE initialization parameter is set to the same value on both the primary and standby databases. If the values differ, redo transportservices may be unable to transmit redo data from the primary database to the standby databases.

D: DB_FILE_NAME_CONVERTSpecify the path name and filename location of the primary database data files followed by the standby location. This parameter converts the path names of theprimary database data files to the standby data file path names.

E: DB_UNIQUE_NAMESpecify a unique name for each database. This name stays with the database and does not change, even if the primary and standby databases reverse roles.

F: FAL_SERVERSpecify the Oracle Net service name of the FAL server (typically this is the database running in the primary role).

References: https://docs.oracle.com/database/121/SBYDB/create_ps.htm#SBYDB4720

QUESTION 3Your Data Guard environment has one physical standby database using Real-Time Query.

Two sentences have been created by these SQL statements:

create sequence a global;create sequence b session;

Neither sequence has been used since being created.

Session 1 connects to the primary database instance and issues these two SQL statements:

SELECT a.nextval FROM DUAL;SELECT b.nextval FROM DUAL;


Then session 2 connects to the physical standby database instance and issues the same SQL statements.

What output will be seen for session 2?

A.

B.

C.

D.

Correct Answer: CSection: (none)Explanation

Explanation/Reference:

QUESTION 4You must propose an Oracle Data Guard configuration for a database supporting an OLTP workload that meets these permanent requirements:

1. Data loss is not permitted.2. Read-only applications should not connect to the primary database instance.

Additionally, there are these requirements, only one of which is ever done at any one time:

3. It should be possible to apply and test designated patches with a minimum amount of downtime.4. Upgrading to a new database release should be performed with the least possible amount of downtime.5. New application software releases should be tested against an exact up-to-date replica of the production database.

You propose a primary database with one physical standby database configured in Maximum Protection mode.


Which requirements do you meet?


A. 2, 3, 4, and 5B. 1, 2, 3, 4, and 5C. 1 and 2D. only requirement 5E. only requirement 1


Explanation/Reference:Explanation:Maximum Protection mode ensures that zero data loss occurs if a primary database fails.Because this data protection mode prioritizes data protection over primary database availability, Oracle recommends that a minimum of two standby databases beused to protect a primary database that runs in maximum protection mode to prevent a single standby database failure from causing the primary database to shutdown.

Incorrect Answers:A, D: Maximum Protection mode ensures that zero data loss occurs if a primary database fails.


QUESTION 5You must configure an Oracle Data Guard environment consisting of:

1. A primary database2. Three Physical Standby Databases

You must meet these requirements:


1. A designated physical standby database should become the primary database automatically whenever the primary database falls.2. The chosen protection mode should provide the highest level of protection possible without violating the other requirement.

Which redo transport mode and protection mode would you configure to meet these requirements?

A. SYNC NOAFFRIM and Maximum ProtectionB. SYNC NOAFFIRM and Maximum AvailabilityC. ASYNC and Maximum PerformanceD. SYNC AFFIRM and Maximum AvailabilityE. SYNC AFFIRM and Maximum Protection

Correct Answer: DSection: (none)Explanation

Explanation/Reference:Explanation:The Maximum Availability protection mode provides the highest level of data protection that is possible without compromising the availability of a primary database.

When a transport is performed using SYNC/AFFIRM, the primary performs write operations and waits for acknowledgment that the redo has been transmittedsynchronously to the physical standby and written to disk. A SYNC/AFFIRM transport provides an additional protection benefit at the expense of a performanceimpact caused by the time required to complete the I/O to the standby redo log.

Incorrect Answers:B: When a transport is performed using SYNC/NOAFFIRM, the primary performs write operations and waits only for acknowledgement that the data has beenreceived on the standby, not that it has been written to disk. The SYNC/NOAFFIRM transport can provide a performance benefit at the expense of potentialexposure to data loss in a special case of multiple simultaneous failures.


QUESTION 6Attempting to start the observer raises an error:

DGMGRL> start observer:

DGM-16954: Unable to open and lock the Observer configuration file Failed.

Identify two possible reasons for this error. (Choose two.)


A. Fast-Start Failover is not yet enabled for this Data Guard configuration.B. The observer configuration file is marked read-only.C. There is already an observer running for this Data Guard configuration.D. There is another observer running for a Data Guard configuration which uses the same observer configuration file.E. The broker configuration has not yet been created.

Correct Answer: BDSection: (none)Explanation

Explanation/Reference:Explanation:Error code: DGM-16954Description: Unable to open and lock the Observer configuration fileCause: The Observer configuration file cannot be opened or cannot be locked for exclusive access.Action: Make sure the Observer has the correct operating system privileges to write the file and there is no other Observer that is using the same file. Try thecommand again.

References: https://www.oraexcel.com/oracle-12cR1-DGM-16954

QUESTION 7Examine the Data Guard configuration:

DGMGRL> show configuration;

Configuration –Animals

Protection Mode: MaxAvailability

Databases:dogs- Primary databasesheep- (*) Physical standby databasecats- Physical standby database

Fast-Start Failover: ENABLED

Configuration Status:SUCCESS

What happens if you issue “switchover” to sheep;” at the DGMGRL prompt?


A. The switchover succeeds but Dogs need to be reinstated.B. The switchover succeeds but Fast-Start Failover is suspended.C. The switchover succeeds and Cats become the new failover target.D. The switchover succeeds and Dogs become the new failover target.E. It results in an error indicating that a switchover is not allowed.


Explanation/Reference:Explanation:Incorrect Answers:E: NOT ALLOWED - Either this is a standby database and the primary database has not been switched first, or this is a primary database and there are no standbydatabases.

QUESTION 8A data file on one of your physical standby databases has been accidentally deleted and you must restore and recover it.

All the archive logs required for recovery are still on disk in the directory pointed to by the log_archive_dest_1 parameter.

Which three steps must be performed to restore the missing file and recover the standby database while it is in the MOUNT state? (Choose three.)

A. Recover the datafile by using the RMAN RECOVER DATAFILE commandB. Restart the redo apply.C. Restore the datafile by using the RMAN RESTORE DATAFILE command.D. Stop the redo apply.E. Recover the database by using the RMAN RECOVER DATABASE command.

Correct Answer: CDESection: (none)Explanation

Explanation/Reference:Explanation:Recovery from Loss of Datafiles on the Standby Database

1. Connect SQL*Plus to the standby database.


2. Stop Redo Apply using the SQL ALTER DATABASE ... statement.3. In a separate terminal, start RMAN and connect to both the standby and recovery catalog databases (use the TARGET keyword to connect to the standby

instance).4. Issue the following RMAN commands to restore and recover datafiles on the standby database:

RESTORE DATAFILE <n,m,...>;RECOVER DATABASE;

5. To restore a tablespace, use the RMAN 'RESTORE TABLESPACE tbs_name1, tbs_name2, ...' command.6. At the SQL*Plus prompt, restart Redo Apply using the SQL ALTER DATABASE ... statement.

References: https://docs.oracle.com/cd/E11882_01/server.112/e41134/rman.htm

QUESTION 9You administer a Data Guard environment consisting of a primary and three physical standby databases.

One physical standby database is used for disaster recovery, one is used for reporting, and one is used as a replica for testing.

The standby database used for testing is occasionally converted into a snapshot standby database and then converted back to a physical standby.

The physical standby database is the only standby that is a mandatory destination.

The broker configuration operates in MAXIMUM PERFORMANCE mode.

Which ARCHIVELOG DELETION POLICY should be set, so that archive logs generated on the primary database are not deleted before they are consumedappropriately on each of the standby databases, but which allows them to be deleted form the primary as soon as it is safe to do so?

A. CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY;B. CONFIGURE ACHIVELOG DELETION POLICY TO APPLIED ON STANDBY;C. CONFIGURE ACHIVELOG DELETION POLICY TO SHIPPED TO ALL STANDBY;D. CONFIGURE ACHIVELOG DELETION POLICY TO SHIPPED TO STANDBY;E. CONFIGURE ACHIVELOG DELETION POLICY TO NONE;

Correct Answer: BSection: (none)Explanation

Explanation/Reference:Explanation:You can change this default deletion policy using the following RMAN command:

CONFIGURE ARCHIVELOG DELETION POLICY TO [CLEAR | NONE | APPLIED ON STANDBY];


Use the APPLIED ON STANDBY clause so that archived redo log files that have been applied on all mandatory standby destinations will be deleted.

Incorrect Answers:A: APPLIED ON ALL STANDBY is not valid.C, D: SHIPPED TO is not valid.E: Use the NONE clause so that archived redo logs in flash recovery area that were backed up or obsolete as per the RMAN retention policy are eligible fordeletion. This is the default configuration. Archived redo log files that are backed up or obsolete are deleted to make space if the disk space in the flash recoveryarea becomes full.

References: https://docs.oracle.com/cd/B19306_01/server.102/b14239/rman.htm#i1031870

QUESTION 10Which four factors can influence the rate of SQL apply on a logical standby database? (Choose four.)

A. the size of the undo tablespace on the logical standby databaseB. the number of full table scans performed by SQL applyC. the number of coordinator processes on the standby database instanceD. the size of the shared poolE. the number of APPLIER processesF. the number of PREPARER processes

Correct Answer: BDEFSection: (none)Explanation

Explanation/Reference:Explanation:B: If a table still does not have any unique index specified on the logical standby database, this may cause UPDATE statements to do full table scans on the logicalstandby database. You can remedy that by adding a unique index on the column on the logical standby database.

E: SQL Apply uses a collection of background processes to apply changes from the primary database to the logical standby database.

During apply processing:* The ANALYZER process identifies dependencies between different transactions.* The COORDINATOR process (LSP) assigns transactions to different appliers and coordinates among them to ensure that dependencies between transactionsare honored.* The APPLIER processes applies transactions to the logical standby database under the supervision of the coordinator process.

F: The PREPARER process is used during the log mining process, which is part of the SQL apply process.


D: The Shared Pool is used by the preparar and Builder proccesses.Figure: SQL Apply Processing

Incorrect Answers:C: There is only one coordinator process.

References: https://docs.oracle.com/cd/B28359_01/server.111/b28294/manage_ls.htm

QUESTION 11Which two are true about database roles in an Oracle Data Guard Configuration? (Choose two.)


A. A configuration consisting only of a primary and one or more physical standby databases can support a rolling release upgrade.B. A Logical Standby Database can be converted to a Snapshot Standby Database.C. A Logical Standby Database can cascade redo to a terminal destination.D. A Snapshot Standby Database can be a fast-start failover target.E. A Physical Standby Database can be converted into a Logical Standby Database.

Correct Answer: BESection: (none)Explanation

Explanation/Reference:Explanation:B: A snapshot standby database can be converted back into a physical standby database at any time.

E: You create a logical standby database by first creating a physical standby database and then transitioning it to a logical standby database.

Incorrect Answers:A: Oracle Database supports the installation of database software upgrades, and the application of patch sets, in a rolling fashion—with near zero databasedowntime—by using Data Guard SQL Apply and logical standby databases.

C: A cascaded redo transport destination (also known as a terminal destination) receives primary database redo indirectly from a standby database rather thandirectly from a primary database. Only physical standby databases can cascade redo.

D: A snapshot standby cannot be the target of a switchover or fast-start failover operation.

References: https://docs.oracle.com/cd/E11882_01/server.112/e41134/create_ls.htm#SBYDB4732https://docs.oracle.com/cd/E11882_01/server.112/e41134/manage_ps.htm#SBYDB00580

QUESTION 12There are currently 6 APPLIER and 6 PREPARER processes running and no idle APPLIER processes on your logical standby database.

The MAX_SERVERS SQL apply parameter and number of archiver processes are both set to 12.

Identify two changes, each of which would allow you to increase the number of APPLIER processes. (Choose two.)

A. Increase the PROCESSES initialization parameterB. Increase the value for the MAX_SERVERS SQL apply parameter.C. Decrease the number of archiver processes on the standby database.D. Increase the PARALLEL_MAX_SERVER initialization parameterE. Decrease the number of PREPARER processes


F. Increase the RECOVERY_PARALLELISM initialization parameter


Explanation/Reference:Explanation:There are three parameters that can be modified to control the number of processes allocated to SQL Apply: MAX_SERVERS, APPLY_SERVERS, andPREPARE_SERVERS. The following relationships must always hold true:

APPLY_SERVERS + PREPARE_SERVERS = MAX_SERVERS - 3

This is because SQL Apply always allocates one process for the READER, BUILDER, and ANALYZER roles.

References: https://docs.oracle.com/cd/B28359_01/server.111/b28294/manage_ls.htm

QUESTION 13Which three statements are true about snapshot standby databases? (Choose three.)

A. Snapshot standby databases may be used for rolling release upgrades.B. If datafiles grow while a database is a snapshot standby database, then they shrink when converted back to a physical standby database.C. Flashback logs are used to convert a snapshot standby database back into a physical standby database.D. A snapshot standby database can have Real-Time Query enabled.E. A guaranteed restore point is created automatically when a physical standby database is converted into a snapshot standby database.

Correct Answer: BCESection: (none)Explanation

Explanation/Reference:Explanation:C: Flashback Database is similar to conventional point-in-time recovery in its effects. It enables you to return a database to its state at a time in the recent past.Flashback Database uses its own logging mechanism, creating flashback logs and storing them in the fast recovery area. You can only use Flashback Database ifflashback logs are available. Flashback Database is used to convert a snapshot standby database back into a physical standby database.

E: When we convert the physical standby database to snapshot standby database a guaranteed restore point is created. This guaranteed restore point is used toflashback a snapshot standby database to its original state.


Incorrect Answers:A: Oracle Database supports the installation of database software upgrades, and the application of patch sets, in a rolling fashion—with near zero databasedowntime—by using Data Guard SQL Apply and logical standby databases.

References:https://docs.oracle.com/cd/E11882_01/server.112/e41134/manage_ps.htm#SBYDB4803http://satya-dba.blogspot.se/2012/06/snapshot-standby-databases-oracle.html

QUESTION 14Which three statements are true about Global Sequences when connected to a physical standby database with Real-Time Query enabled? (Choose three.)

A. If the CACHE option is set then the size of the cache must be at least 100.B. Their creation requires that a LOG_ARCHIVE_DEST_n parameter be defined in the standby that points back to their primary.C. Their usage will always have a performance impact on the primary database.D. Their usage may have a performance impact on the physical standby database if the CACHE size is too smallE. They must have the NOORDER and CACHE options set.

Correct Answer: BDESection: (none)Explanation

Explanation/Reference:Explanation:B: the terminal standby should have a LOG_ARCHIVE_DEST_n parameter defined that points back to the primary.

D: Because the standby's requests for a range of sequences involve a round-trip to the primary, be sure to specify a large enough value for the CACHE keywordwhen you create a sequence that will be used on an Oracle Active Data Guard standby. Otherwise, performance could suffer.

E: In an Oracle Active Data Guard environment, sequences created by the primary database with the default CACHE and NOORDER options can be accessedfrom standby databases as well.

References: https://docs.oracle.com/database/121/SBYDB/manage_ps.htm#SBYDB5164

QUESTION 15Examine this query and its output:

SQL> select fs_failover_status, fs_failover_current_target, 2 fs_failover_observer_present, fs_failover_oserver_host 3 from v$database:FS_FAILOVER_STATUS FS_FAILOVER_CURRENT_TARGET


FS_FAILOVER_OBSERVER_PRESENT FS_FAILOVER_OBSERVER_HOST

--------------- ----------------------- ---------------- ------------------BYSTANDER cats NOO17.example.com

Which are true?

A. The observer is not connected to the database on which the query was executed.B. Cats is a bystander database.C. The observer is connected to the database on which the query was executed.D. The observer is currently running on o17.example.com.E. The observer is not running, but should run on o17.example.com.

Correct Answer: ASection: (none)Explanation

Explanation/Reference:Explanation:Viewing Information About the ObserverYou can find information about the observer by querying the following columns in the V$DATABASE view:* FS_FAILOVER_OBSERVER_HOST shows the name of the computer on which the observer is running. Here it is cats.

* FS_FAILOVER_OBSERVER_PRESENT shows whether or not the observer is connected to the local database. Here the value is NO.

References: https://docs.oracle.com/cd/B19306_01/server.102/b14230/sofo.htm

QUESTION 16Which three are true about using RMAN in a Data Guard environment? (Choose three.)

A. A recovery catalog is required when RMAN is used to take backups from a logical standby database in a Data Guard configuration if you plan to recover theprimary using those backups.

B. Backups of archived redo logs taken on a physical standby are interchangeable with a primary.C. A recovery catalog is required when RMAN is used to take backups from a physical standby database if you plan to recover the primary using those backups.D. Backups of control files taken on a physical standby are not interchangeable with a primary.E. Backups of data files taken on a physical standby are interchangeable with a primary.

Correct Answer: BCE


Section: (none)Explanation

Explanation/Reference:Explanation:RMAN uses a recovery catalog to track filenames for all database files in a Data Guard environment. A recovery catalog is a database schema used by RMAN tostore metadata about one or more Oracle databases. The catalog also records where the online redo logs, standby redo logs, tempfiles, archived redo logs, backupsets, and image copies are created.

RMAN commands use the recovery catalog metadata to behave transparently across different physical databases in the Data Guard environment. For example,you can back up a tablespace on a physical standby database and restore and recover it on the primary database. Similarly, you can back up a tablespace on aprimary database and restore and recover it on a physical standby database.

Incorrect Answers:A: Because a logical standby database is not a block-for-block copy of the primary database, you cannot use a logical standby database to back up the primarydatabase

D: Backups of standby control files and nonstandby control files are interchangeable. For example, you can restore a standby control file on a primary database anda primary control file on a physical standby database. This interchangeability means that you can offload control file backups to one database in a Data Guardenvironment. RMAN automatically updates the filenames for database files during restore and recovery at the databases.

References: https://docs.oracle.com/cd/E11882_01/server.112/e41134/rman.htm#SBYDB4853

QUESTION 17Which four requirements can be met by deploying a logical standby database? (Choose four.)

A. Support for workloads requiring additional indexes.B. It can be used to create additional schemas.C. It can be used to create additional tables.D. It must have the same physical structure as the primary database.E. it must provide a disaster-recovery solution that protects all data with capability of performing switchovers and failovers.F. Support for workloads requiring additional materialized views.G. It can be used for Real Application Testing without affecting the disaster recovery capabilities.

Correct Answer: ACEGSection: (none)Explanation



Explanation:A: DDL Statements supported by a Logical Standby Database include:ALTER INDEXCREATE INDEXDROP INDEX

C: DDL Statements supported by a Logical Standby Database include:CREATE TABLEDROP TABLE

Incorrect Answers:D: The physical organization in a logical standby database is different from that of the primary database, even though the logical standby database is created from abackup copy of the primary database.

F: DDL Statements not supported by a Logical Standby Database include:CREATE MATERIALIZED VIEW

References: https://docs.oracle.com/cd/E11882_01/server.112/e41134/create_ls.htm#SBYDB4731https://docs.oracle.com/cd/B28359_01/server.111/b28294/data_support.htm

QUESTION 18A query on the view DBA_LOGSTDBY_UNSUPPORTED on your primary database returns several rows.

As a result of this, you decide that an upgrade may not use logical standby databases.

Which three are true about upgrading Data Guard environments consisting of one physical standby database running on a separate host from the primary?(Choose three.)

A. The upgrade requires downtime until the upgrade of the standby is completed.B. The broker must be disabled during the upgrade.C. With manual upgrade, catupgrd.sq1 can be executed on the primary and standby databases simultaneously.D. The upgrade requires downtime until the upgrade of the primary is completed.E. The new release of the Oracle Software must be installed on both the primary and standby database hosts.F. Redo Apply on the standby database must be stopped while the primary database is upgraded.G. Fast-Start Failover can be used to protect the primary database during the upgrade.

Correct Answer: BDESection: (none)Explanation


Explanation/Reference:Explanation:B: Disable the broker's management of the configuration and then stop the broker.

E: On the primary database install the newer release of the Oracle software, and on the logical standby database, install the newer release of the Oracle software.

Incorrect Answers:C: Oracle Database 12c introduces a new command-line upgrade utility (catctl.pl). This utility replaces the catupgrd.sql script used to upgrade to previous releasesof Oracle Database. The new command-line upgrade utility enables parallel processing during the database upgrade, resulting in better upgrade performance andreduced database downtime.

G: Disable fast-start failover if it is enabled.

References:https://docs.oracle.com/database/121/SBYDB/upgrades.htm#SBYDB1200https://docs.oracle.com/database/121/DGBKR/upgrade_appx.htm#DGBKR1212

QUESTION 19You are licensed to use Oracle Active Data Guard.

Which two statements are true after enabling block change tracking on a physical standby database? (Choose two.)

A. It allows fast incremental backups to be offloaded to the physical standby database.B. It starts the CTWR process on the physical standby database instance.C. It allows fast incremental backups to be taken on the primary database.D. It starts the RVWR process on the physical standby database instance.E. It allows fast incremental backups to be offloaded to a snapshot standby database, when the physical standby database in converted.F. It starts the CTWR process on the primary database instance.

Correct Answer: ABSection: (none)Explanation

Explanation/Reference:Explanation:A: Many of the customers now are opting to perform RMAN backups on standby database to offload the resources of production database. B: To enable Active Data Guard on a standby database, set the ENABLE_OPTION_ACTIVE_DATA_GUARD initialization parameter to TRUE.

Note: Fast Incremental backups is possible with Block change tracking, which is initially introduced from version 10.2 onwards, by this tool it's very useful to reduce


the RMAN incremental backup duration but it is limited only for Primary database. From 11g Oracle with Active Data Guard feature we can use Block changetracking even on Physical standby database.

References: http://www.morganslibrary.org/reference/block_change_tracking.html

QUESTION 20Which three are true regarding the Enterprise Manager Cloud Control Data Guard configuration verification wizard? (Choose three.)

A. It checks that supplemental logging is turned on if there is a logical standby database in the configuration.B. It verifies that parameter settings in the SPFILE or in memory or both, are consistent with the broker configuration properties for that database.C. It checks that the current data protection level is consistent with the broker’s configured data protection mode.D. It modifies the database configurable parameters to match the values set for the broker configuration.E. It generates a workload on the primary database causing log switching, and monitors the arrival rate of redo on the standby database.

Correct Answer: ABCSection: (none)Explanation

Explanation/Reference:Explanation:Usually Data Guard configuration verification is kind of health check of Data Guard, it does many things like performing complete health check, verifying the FSFOstatus, determination of protection mode, availability of standby redo log files, Data Guard status whether valid or not, After the log switch whether the sequence isshipping to standby or not and Data Guard properties. To initiate Data Guard verification Navigation is "Availability --> Verify Data Guard Configuration".


References: http://www.toadworld.com/platforms/oracle/w/wiki/11149.monitoring-troubleshooting-data-guard-using-em12c

QUESTION 21You created a physical standby database PRODSBY1 from the primary database PROD using SQL and RMAN.



Which two are prerequisites for creating a Data Guard Broker configuration to manage these databases? (Choose two.)

A. The standby database must have supplemental logging enabled.B. The primary database must have FORCE LOGGING enabled.C. The DG_BROKER_START parameter must be set to TRUE for both database instances.D. The primary database must have supplemental logging enabled.E. A local net service name to enable connectivity to the PRODSBY1 database instance must be defined on the primary database host.


Explanation/Reference:Explanation:B: Enabled forced logging on the primary database by issuing the following command.

ALTER DATABASE FORCE LOGGING;-- Make sure at leat one logfile is present.ALTER SYSTEM SWITCH LOGFILE;

C: Enable BrokerWhen we have a primary database and a standby database, we need to start using the Data Guard Broker to manage them. Connect to both databases (primaryand standby) and issue the following command.

ALTER SYSTEM SET dg_broker_start=true;

References: https://oracle-base.com/articles/12c/data-guard-setup-using-broker-12cr1

QUESTION 22In which two cases is it possible to change the protection mode to maximum protection using Enterprise Manager Cloud Control? (Choose two.)


A. A snapshot standby database is the only standby database in the Data Guard configuration.B. A logical standby database is the only standby database in the data guard configuration.C. A far sync instance is the only Data Guard configuration member receiving redo in synchronous mode.D. Flashback is not enabled for either the primary database, the standby database, or both in the Data Guard configuration.E. The primary and standby databases are hosted on different operating systems.


Explanation/Reference:Explanation:Maximum protection mode requires the SYNC redo transport mode to be set on at least one standby database.

Note:The Maximum protection mode ensures that no data loss will occur if the primary database fails. To provide this level of protection, the redo data needed to recovera transaction must be written to both the online redo log and to the standby redo log on at least one synchronized standby database before the transaction commits.To ensure that data loss cannot occur, the primary database will shut down, rather than continue processing transactions, if it cannot write its redo stream to at leastone synchronized standby database.

References: http://www.oracle.com/technetwork/oem/framework-infra/wp-em12c-building-ha-level3-1631423.pdf

QUESTION 23Which two are true about the usage of DBMS_ROLLING? (Choose two.)

A. The leading group contains the original primary database.B. The trailing group contains the original primary database.C. The background process DMON must be enabled on all database instances that take part in the rolling release upgrade process.D. At least one logical standby database must be part of the initial Data Guard configuration.E. The trailing group can contain standby databases that will protect the original primary database during the rolling release upgrade process.

Correct Answer: DESection: (none)Explanation

Explanation/Reference:Explanation:E: The trailing group contains the original primary database and standby databases that will protect the original primary during the rolling upgrade process.


D: Databases in the leading group are upgraded first; hence the name leading group. The leading group contains the designated future primary database, and thephysical standbys that you can configure to protect the designated future primary. The future primary is first converted into a logical standby database and then thenew database software is installed on it and the upgrade process is run. Other standby databases in the leading group also must have their software upgraded atthis point.

Note: To upgrade the database software in an Oracle Data Guard configuration in a rolling fashion, you first designate a physical standby as the future primarydatabase.

Conceptually, the rolling upgrade process splits the Oracle Data Guard configuration into two groups: the leading group (LG) and the trailing group (TG).

Incorrect Answers:A: The leading group contains the designated future primary database, and the physical standbys that you can configure to protect the designated future primary.

References: https://docs.oracle.com/database/121/SBYDB/dbms_rolling_upgrades.htm#SBYDB5431

QUESTION 24Which three statements are true about Far Sync instances? (Choose three.)

A. The Data Guard Broker must be used to deploy and manage Far Sync instances.B. They enable standby database to be configured at remote distances from the primary without impacting performance on the primary.C. A primary database can ship redo directly to multiple Far Sync instances.D. They use as spfile, a standby controlfile, and standby redo logs.E. They work with any protection level.

Correct Answer: ABDSection: (none)Explanation

Explanation/Reference:Explanation:A: The far sync instance is added to a Data Guard broker configuration.B: Creating a far sync instance is similar to creating a physical standby except that data files do not exist at the far sync instance. Therefore, on a far sync instancethere is no need to copy data files or restore data files from a backup. Once the far sync instance has been created, the configuration is modified to send redosynchronously from the primary database to the far sync instance in Maximum Availability mode and the far sync instance then forwards the redo asynchronously inreal time.

D: Creating and Configuring a Far Sync InstanceTake the following steps to create a far sync instance:1. Create the control file for the far sync instance.2. Create a parameter file (PFILE) from the server parameter file (SPFILE) used by the primary database.


3. Create a server parameter file (spfile) from the edited parameter file (pfile) to facilitate any subsequent changes to parameter values.4. Use an operating system copy utility to copy the far sync instance control file created in Step 1 and the server parameter file (spfile) created in Step 3 from theprimary system to the appropriate locations on the far sync instance system.5. Create standby redo logs in the same way they are created for a regular standby.Etc.

Incorrect Answers:C: A far sync instance manages a control file, receives redo into standby redo logs (SRLs), and archives those SRLs to local archived redo logs.E: A far sync instance is supported in either maximum performance or maximum availability mode only.

References: https://docs.oracle.com/database/121/SBYDB/create_fs.htm

QUESTION 25Which three statements are true about snapshot standby databases? (Choose three.)

A. Tablespaces can be dropped.B. Tables can be dropped.C. The broker may be used to fail over to a snapshot standby database.D. A logical standby database can be converted into a snapshot standby database.E. Tablespaces can be created.

Correct Answer: ABESection: (none)Explanation

Explanation/Reference:Explanation:Incorrect Answers:Not C: A snapshot standby database cannot be the target of a switchover or failover. A snapshot standby database must first be converted back into a physicalstandby database before performing a role transition to it.

D: A snapshot standby database is a fully updatable standby database that is created by converting a physical standby database into a snapshot standby database.

References: https://docs.oracle.com/cd/B28359_01/server.111/b28294/manage_ps.htm

QUESTION 26Which three are benefits of using the Data Guard Broker to manage standby databases? (Choose three.)

A. It simplifies physical standby database creation.


B. It provides an easy failover capability using a single command.C. It coordinates database state transitions and updates database properties dynamically.D. It automatically changes database properties after the protection mode for a configuration is changed.E. It provides an easy switchover capability using a single command.F. It simplifies logical standby database creation.G. It load balances connections between the primary and all the standby database instances that are open as read-only for reporting.


Explanation/Reference:Explanation:BE: The broker simplifies switchovers and failovers by allowing you to invoke them using a single key click in Oracle Enterprise Manager or a single command atthe DGMGRL command-line interface (referred to in this documentation as manual failover).

C: The broker coordinates database state transitions and update database properties dynamically with the broker recording the changes in a broker configurationfile that includes profiles of all the databases in the configuration. The broker propagates the changes to all databases in the configuration and their serverparameter files.

References: https://docs.oracle.com/cd/E11882_01/server.112/e40771/concepts.ht

QUESTION 27Which three are always benefits of using a logical standby database? (Choose three.)

A. It can be used for database rolling release upgrades.B. It can be used to replicate a single pluggable database (PDB) in a multitenant container database.C. It can be used as an updatable database for Real Application testing and then converted back to a standby database without affecting the updates.D. It can be used for reporting workloads requiring additional indexes or materialized views or both.E. It provides a disaster-recovery solution with switchover and failover options that can recover any data updated on the primary database.F. It can be used for testing patches without affecting the primary database.

Correct Answer: CDFSection: (none)Explanation

Explanation/Reference:Explanation:


C: A logical standby database can be used to test new software releases and some kinds of applications on a complete and accurate copy of the primary's data. Itcan host other applications and additional schemas while protecting data replicated from the primary against local changes.D: A logical standby database is open read/write while changes on the primary are being replicated. Consequently, a logical standby database can simultaneouslybe used to meet many other business requirements, for example it can run reporting workloads that would problematical for the primary's throughput.F: Logical standby can be used to greatly reduce downtime associated with applying patchsets and new software releases. A logical standby can be upgraded to thenew release and then switched over to become the active primary. This allows full availability while the old primary is converted to a logical standby and the patchsetis applied.

References: https://docs.oracle.com/cd/E11882_01/server.112/e41134/standby.htm#SBYDB00103

QUESTION 28Which two are prerequisites for creating a standby database using Enterprise Manager cloud control? (Choose two.)

A. The primary database must have FORCE LOGGING enabled.B. The primary database must be in archivelog mode.C. A backup of the primary database must exist.D. The primary host and the proposed standby database host must run the same operating system.E. The primary database instance must be started using an SPFILE.F. The primary database must have flashback enabled.


Explanation/Reference:Explanation:A: Before you create a standby database you must first ensure the primary database is properly configured.Place the primary database in FORCE LOGGING mode.

B: If archiving is not enabled, issue the following SQL statements to put the primary database in ARCHIVELOG mode and enable automatic archiving:

SQL> SHUTDOWN IMMEDIATE;SQL> STARTUP MOUNT;SQL> ALTER DATABASE ARCHIVELOG;SQL> ALTER DATABASE OPEN;

References: https://docs.oracle.com/database/121/SBYDB/create_ps.htm#SBYDB4719

QUESTION 29A Data Guard environment has this configuration and these attributes:


1. The primary database prima is in the local region.2. A physical standby database physt1 is in the local region.3. A physical standby database physt2 is in a remote region.4. The primary ships redo to physt1.5. physt1 ships redo physt2.6. physt1 and physt2 have Real-Time Query enabled.

A sequence has been created with this SQL statement in the primary database:

CREATE SEQUENCE a NOCACHE SESSION:

Which two statements are true? (Choose two.)

A. The sequence is usable on physt1 and physt2.B. The sequence is usable on physt1 but not usable on physt2.C. The sequence is usable on physt2 if physt1 becomes unavailable, but only if an alternative redo destination has been configured on the primary database.D. physt2 will no longer receive redo if physt1 becomes unavailable, unless LOG_ARCHIVE_DEST_n has the ALTERNATE attribute specified on the primary

database.E. physt2 will no longer receive redo if physt1 becomes unavailable, unless LOG_ARCHIVE_DEST_n has the ALTERNATE attribute specified on physt1.

Correct Answer: CESection: (none)Explanation

Explanation/Reference:Explanation:Note: LOG_ARCHIVE_DEST_n specifies an alternate archiving destination to be used when the original destination fails.The ALTERNATE attribute is optional. If an alternate destination is not specified, then redo transport services do not automatically change to another destination ifthe original destination fails.

References: https://docs.oracle.com/cd/B28359_01/server.111/b28294/log_arch_dest_param.htmhttps://docs.oracle.com/database/121/SQLRF/statements_6017.htm#SQLRF01314

QUESTION 30Which two are prerequisites for enabling Automatic Block Media Recovery in a Data Guard environment consisting of a primary database, one physical standbydatabase and one logical standby database? (Choose two.)

A. FLASHBACK DATABASE must be enabled on the physical standby database.B. There must be connectivity between the primary and the physical standby database.C. FLASHBACK DATABASE must be enabled on the primary database.


D. The physical standby database must have Real-Time Apply enabled.E. The logical standby database must have Real-Time Query enabled.

Correct Answer: CDSection: (none)Explanation

Explanation/Reference:Explanation:C: Flashback Database must be enabled on the target database for RMAN to search the flashback logs for good copies of corrupt blocks. You must have alreadyenabled Flashback Database on the original primary database before the failover.

D: Block media recovery is a technique for restoring and recovering corrupt data blocks while data files are online. If only a few blocks are corrupt, then block mediarecovery may be preferable to data file media recovery. For automatic block media recovery to work, a physical standby database must be in real-time query mode,which requires an Oracle Active Data Guard license.

References:https://docs.oracle.com/cd/E11882_01/server.112/e41134/scenarios.htmhttps://docs.oracle.com/database/121/BRADV/rcmblock.htm#BRADV89786


DGMGRL > show configuration:

Configuration –AnimalsProtection Mode: MaxAvailabilityDatabases:cats- Primary databasedogs-Physical standby databasesheep-Logical standby database

Fast-Start Failover: DISABLED


Which three will be true after a switchover to Dogs? (Choose three.)

A. Sheep will be an enabled logical standby database.B. Cats will be an enabled physical standby database.


C. Dogs will be the primary database.D. Sheep will be a disabled logical standby database.E. Cats will be a disabled physical standby database.

Correct Answer: ABCSection: (none)Explanation


QUESTION 32Which three are required in order to use Real-Time Query without lagging behind the primary? (Choose three.)

A. There must be standby redo logs on the standby database.B. There must be standby redo logs on the primary database.C. The primary must ship redo asynchronously.D. COMPATIBLE must be set to 11.1.0 or higher.E. Real-Time apply must be enabled on the standby.

Correct Answer: ADESection: (none)Explanation

Explanation/Reference:Explanation:D: The COMPATIBLE database initialization parameter must be set to 11.0 or higher to use the real-time query feature of the Oracle Active Data Guard option.

E: The apply lag control and Redo Apply synchronization mechanisms require that the client be connected and issuing queries to a physical standby database thatis in real-time query mode.

Incorrect Answers:C: The standby database must receive redo data via the SYNC transport.

References: https://docs.oracle.com/cd/E11882_01/server.112/e41134/manage_ps.htm#SBYDB00707

QUESTION 33Examine the Fast-start configuration:

DGMGRL> show fast_start failover;


Fast-Start Failover: ENABLED

Threshold : 30 secondsTarget: sheepObserver : 017.example.comLag Limit: 30 seconds (not in use)Shutdown Primary: TRUEAuto-reinstate: TRUEObserver Reconnect: (none)Observer Override: FALSE

Configurable Failover Conditions

Health Conditions:Corrupted Controlfile YESCorrupted Dictionary YESInaccessible Logfile NOStuck Archiver YESDatafile Offline YES

Oracle Error Conditions:(none)

Which three are true? (Choose three.)

A. The observer will initiate a failover when the primary database is unable to produce local archived redo log files.B. An automatic failover will be initiated even if the target standby database lags behind the primary.C. The observer is running.D. A failover may occur if the observer has lost connectivity to the primary database, even if the Fast-Start Failover target standby database has a good connection

to the primary database. E. The configuration operates in Maximum Availability mode.F. The configuration operates in Maximum Performance mode.

Correct Answer: ACESection: (none)Explanation

Explanation/Reference:Explanation:A: Stuck Archiver: YES


Archiver is unable to archive a redo log because the device is full or unavailable.

C: Observer : 017.example.com

E: The FastStartFailoverLagLimit configuration property is only used by the broker when enabling fast-start failover for configurations operating in maximumperformance mode.

References: https://docs.oracle.com/cd/E11882_01/server.112/e40771/sofo.htm#DGBKR330

QUESTION 34Which three are true concerning restoring of RMAN backups to primary and physical standby databases in a Data Guard environment? (Choose three.)

A. Backups of data files taken on the primary database may be restored on a physical standby database.B. Backups of control files taken on the primary database may not be restored and used on a physical standby database.C. Backups of SPFILEs taken on a physical standby database may not be restored on the primary database.D. Backups of control files taken on a physical standby database may be restored on the primary database.E. Backups of data files taken on a physical standby database may be restored on a primary database.F. Backups of SPFILEs taken on the primary database may not be restored and used on a physical standby database.

Correct Answer: CEFSection: (none)Explanation

Explanation/Reference:Explanation:C, F: All backup operations can be offloaded to a single standby database, except backups of the SPFILE. Backups of the SPFILE can only be restored to thedatabase from which they were backed up.

E: RMAN restores database files, over the network, from a physical standby database.As of Oracle Database 12c, RMAN lets you restore or recover files by connecting, over the network, to a physical standby database that contains the required files.You can restore an entire database, data files, control files, spfile, or tablespaces.

Note: An Oracle database consists of one or more logical storage units called tablespaces, which collectively store all of the database's data. Each tablespace in anOracle database consists of one or more files called datafiles, which are physical structures that conform to the operating system in which Oracle is running.

References: https://docs.oracle.com/database/121/SBYDB/rman.htm#SBYDB00755

QUESTION 35Which statement is true regarding Oracle Net connectivity for a Data Guard Broker configuration?


A. To start SQL apply on a logical standby database, a TNS entry enabling connectivity to the primary database instance must be defined on the logical standbydatabase host.

B. the LOCAL_LISTERNER initialization parameter must be set to the listener used to register the primary database instance.C. To enable Real_Time Query on a physical standby database, a TNS entry enabling connectivity to the standby database instance must be defined on the

primary database host.D. A TNS enabling connectivity to the primary database instance must be defined on each of the standby database hosts.E. A TNS entry or entries enabling connectivity to standby database instance(s) must be defined on the primary database host.


Explanation/Reference:Explanation:The tnsnames.ora on both Primary as well as Standby sites have entries for the databases.

Note: TNSNAMES.ORA is a SQL*Net configuration file that defines databases addresses for establishing connections to them.

References: http://gavinsoorma.com/2013/08/minimal-downtime-rolling-database-upgrade-to-12c-release-1/

QUESTION 36Examine this list of possible steps:

1.Raise the compatibility level on both databases.2.Restart SQL Apply on the upgraded logical standby database.3. Start SQL Apply on the old primary database.4. Perform a Switchover to the logical standby database.5. Upgrade the logical standby database.6. Upgrade the old primary database.

Which is the minimum number of steps in the correct order, to perform a rolling release upgrade of a data guard environment using an existing logical standbydatabase and to enable the new functionality?

A. 5, 2, 4, 3, 6, 1B. 1, 5, 2, 4, 6, 3C. 5, 2, 4, 6, 3, 1D. 4, 6, 5, 2, 3, 1E. 5, 2, 4, 1


Correct Answer: ASection: (none)Explanation

Explanation/Reference:Explanation:Execution: Execution of the rolling upgrade has five stages.

Stage 1 (5): The DBMS_ROLLING.START_PLAN procedure starts the execution of the rolling upgrade. This converts the LGM database, the future primarydatabase, to a logical standby and starts the SQL Apply process at the LGM.

Stage 2 (2): You upgrade the database software at the databases that are part of the leading group. You also run the upgrade scripts at the LGM. After this is done,you must restart SQL Apply processes at the LGM database.

Stage 3 (4): After the apply lag reaches a given threshold (set to 10 minutes by default, but can be configured during the specification stage), theDBMS_ROLLING.SWITCHOVER procedure proceeds with the switchover operation. When the switchover is complete, the LGM becomes the primary database.

Stage 4: The LGM is now the primary database running the new database software and the databases in the leading group are protecting it. The TGM is mountedand the databases in the trailing group are still running the older version of the database software. You must prepare the TGM and TGS databases for upgrade byupgrading the database software and re-mounting the databases on the higher version binaries.

Stage 5 (3, 6): Execute the DBMS_ROLLING.FINISH_PLAN procedure at the current primary database (originally the LGM). It reinstates all the databases in thetrailing group to become the standbys of the current primary database, and restarts the apply processes. The FINISH_PLAN procedure waits for all databases inthe trailing group to be upgraded to the new release (although the database software for the trailing group databases was changed in Stage 4, the data dictionary ofthe trailing group databases, except for any logical standbys in the trailing group, are updated based on media recovery of the redo generated during the upgrade atthe LGM database).

Note: To upgrade the database software in an Oracle Data Guard configuration in a rolling fashion, you first designate a physical standby as the future primarydatabase.

Conceptually, the rolling upgrade process splits the Oracle Data Guard configuration into two groups: the leading group (LG) and the trailing group (TG).

Databases in the leading group are upgraded first; hence the name leading group. The leading group contains the designated future primary database, and thephysical standbys that you can configure to protect the designated future primary. The future primary is first converted into a logical standby database and then thenew database software is installed on it and the upgrade process is run. Other standby databases in the leading group also must have their software upgraded atthis point.

References: https://docs.oracle.com/database/121/SBYDB/dbms_rolling_upgrades.htm

QUESTION 37


Which three are prerequisites for enabling Fast-Start Failover? (Choose three.)

A. The Fast-Start Failover target standby database must receive REDO directly from the primary database.B. Flashback Database must be enabled on both the primary database and the Fast-Start Failover target standby database.C. Flashback Database must be enabled only on the Fast-Start Failover target standby database.D. The configuration must be operating in either Maximum Performance or Maximum Availability mode.E. The configuration must be operating in either Maximum Performance or Maximum Protection mode.F. The Data Guard environment must be managed by the Data Guard Broker.

Correct Answer: BDFSection: (none)Explanation

Explanation/Reference:Explanation:B: You enable the Flashback Mode both on the primary database and on the standby database.

D: In Maximum Availability mode, Fast-Start Failover (FSFO) guarantees that no transaction that has received a commit acknowledgment will be lost during afailover. Oracle Database 11g FSFO adds support for Maximum Performance mode (async redo transfer), providing the flexibility to trade durability for performance.

F: The Dataguard Broker Observer (Observer) is used when fast start failover is required. Fast start failover is simply an automatic failover to the standby database

Incorrect Answers:C: You enable the Flashback Mode both on the primary database and on the standby database.

References:http://dbasoumya.blogspot.se/2015/07/fast-start-failoverfsfo-in-oracle-11g.htmlhttp://www.oracle.com/technetwork/articles/smiley-fsfo-084973.html

QUESTION 38You must design an Oracle Data Guard configuration for an OLTP database that meets these permanent requirements:

1. Data loss is not permitted.2. Read-only applications should not connect to the primary database instance.

Additionally, there are these requirements, only one of which is ever done at any one time:

1. It should be possible to apply designated patches with a minimum amount of downtime.2. Upgrading to a new database release should be performed with the least possible amount of downtime.3. New application software releases should be tested against an exact and up-to-date replica of the primary database.


Which configuration meets these requirements with the fewest databases?

A. a primary database with three physical standby databasesB. a primary database with one logical and two physical standby databasesC. a primary database with one logical standby databaseD. a primary database with one logical and one physical standby databaseE. a primary database with two physical standby databasesF. a primary database with one physical standby database



QUESTION 39Which two are true about management of a far sync instance when using the Data Guard Broker? (Choose two.)

A. A far sync instance is in a disabled state in the broker configuration immediately after adding it.B. A far sync instance that has its RedoRoutes property set may not be disabled in the broker configuration.C. Broker management of a far sync instance may only be disabled with the disable configuration DGMGRL command.D. A far sync instance need not exist before adding it to the broker configuration but may not be enabled until created.


Explanation/Reference:Explanation:A: ADD FAR_SYNCAdds an existing far sync instance to an Oracle Data Guard broker configuration.

The far sync instance is disabled after creation. You must explicitly enable it before the broker can ship redo to and from it.

B: A far sync instance that has its RedoRoutes property set cannot be disabled.

Incorrect Answers:


D: The far sync instance must already exist before you can add it to a broker configuration.

References: https://docs.oracle.com/database/121/DGBKR/dgmgrl.htm

QUESTION 40Your Data Guard environment has two remote physical standby databases.

Client applications use the local naming method to define connectivity to the primary database instance.

Which will automatically redirect clients to the new primary database in case of a switchover or failover?

A. Create a database service on the standby databases; automate the start of the service after a role change, and modify the connection description on the clientsto use that service.

B. Configure a PRIMARY role service on the Primary and Standby and modify the Client connect descriptor to include both Primary and the Standby.C. Set the DB_NAME parameter identically on all databases; modify the connection descriptor on the clients to use DB_NAME to connect to the primary database

instance.D. Set the LOCAL_LISTENER parameter for all the database instances, to register services with the default listener on the primary database host.


Explanation/Reference:Explanation:Example of error:TNS-12514”TNS: could not resolve the connect identifier specified"*Cause:A connection to a database or other service was requested using a connect identifier, and the connect identifier specified could not be resolved into a connectdescriptor using one of the naming methods configured.

*Actions include:- Check that the net service name used as the connect identifier exists in the TNSNAMES.ORA file.- If you are using local naming (TNSNAMES.ORA file):- Make sure that "TNSNAMES" is listed as one of the values of the NAMES.DIRECTORY_PATHparameter in the Oracle Net profile (SQLNET.ORA)- Verify that a TNSNAMES.ORA file exists and is in the proper directory and is accessible.- Make sure there are no syntax errors anywhere in the TNSNAMES.ORA file. Look for unmatched

References: http://www.oracle.com/us/solutions/sap/wp-ora4sap-dataguard11g-303811.pdf


QUESTION 41Your Data Guard environment consists of these components and settings:

1. A primary database supporting an OLTP workload2. A remote physical standby database3. Real-time query is enabled4. The redo transport mode is set to SYNC.5. The protection mode is set to Maximum Availability.

Which two are true regarding the DelayMins Database Property for the standby database? (Choose two.)

A. It can only be enabled for a configuration in Maximum Performance mode.B. It allows user errors on the primary to be recovered by using the physical standby database.C. It enables you to bypass the default network timeout interval specified for the standby redo transport destination.D. It can only be enabled for a configuration in Maximum Availability mode.E. It allows logical corruptions on the primary to be recovered by using the physical standby database.F. It specifies a delay before the primary ships redo to the standby destination having DelayMins set.

Correct Answer: BFSection: (none)Explanation

Explanation/Reference:Explanation:F: The DelayMins configurable database property specifies the number of minutes log apply services will delay applying the archived redo log data on the standbydatabase.

References: https://docs.oracle.com/cd/E11882_01/server.112/e40771/dbpropref.htm#DGBKR855


DGMGRL> show configuration:



Databases:dogs- Primary databasecats- Snapshot standby database


sheep- Snapshot standby database


Configuration Status:

ORA-01034: ORACLE not availableORA-16625: cannot reach database “dogs”DGM-17017: unable to determine configuration status

Which three will be true after a successful failover to Cats? (Choose three.)

A. Sheep will be in the disabled state.B. Sheep will be in the enabled state.C. Dogs will be in the disabled state and has to be manually reinstated.D. The configuration will be in Maximum Performance mode.E. The configuration will be in Maximum Availability mode.

Correct Answer: BCDSection: (none)Explanation

Explanation/Reference:Explanation:Incorrect Answers:E: Because the Maximum Protection data mode prioritizes data protection over primary database availability, Oracle recommends that a minimum of two standbydatabases be used to protect a primary database that runs in maximum protection mode to prevent a single standby database failure from causing the primarydatabase to shut down.



DGMGRL> show configuration:



Databases:


dogs- Primary databasesheep-Logical standby databasecats- Logical standby database



Which three will be true after a switchover to Sheep? (Choose three.)

A. Cats will be an enabled logical standby database.B. Cats will be a disabled logical standby database.C. Dogs will be a logical standby database.D. Dogs will be a physical standby database.E. Sheep will be the primary database.

Correct Answer: ACESection: (none)Explanation

Explanation/Reference:Explanation:A switchover is a role reversal between the primary database and one of its standby databases. A switchover guarantees no data loss and is typically done forplanned maintenance of the primary system. During a switchover, the primary database transitions to a standby role, and the standby database transitions to theprimary role.

References: https://docs.oracle.com/cd/B28359_01/server.111/b28295/sofo.htm

QUESTION 44Which three are true concerning Automatic Block Media Recovery in a Data Guard environment when running an application as an ordinary Oracle user? (Choosethree.)

A. Real Time Query must be enabled on the primary database.B. Real Time Query must be enabled on the physical standby database.C. If a physically corrupt block is discovered on a physical standby database, then a valid block image from the primary database is retrieved.D. If a physically corrupt block is discovered on the primary database, then a valid block image from a physical standby database is retrieved.E. If a physically corrupt block is discovered on a logical standby database, then a valid block image from the primary database is retrieved.F. If a physically corrupt block is discovered on a primary database, then a valid block image from the logically standby database is retrieved.


Correct Answer: BCDSection: (none)Explanation

Explanation/Reference:Explanation:B: For automatic block media recovery to work, a physical standby database must be in real-time query mode, which requires an Oracle Active Data Guard license.

D: A physical standby database operating in real-time query mode can be used to repair corrupt data blocks in a primary database.

C: If corruption occurs on the primary database, blockmedia recovery is performed automatically using a good copy of the block from the standby database and viceversa.

References: https://ora600tom.wordpress.com/2013/09/07/abmr-automatic-block-media-recovery/

QUESTION 45Which two are true about offloading backups to a physical standby database in a Data Guard environment? (Choose two.)

A. The standby database must be registered in an RMAN catalog after the primary database has been registered.B. The standby database cannot be registered in an RMAN catalog if the primary database has not been registered.C. Backups of the standby control file taken while connected to the catalog where the database is registered, may be used to restore the control file on the primary

database.D. The standby database must be registered in an RMAN catalog before the primary database has been registered.


Explanation/Reference:Explanation:Only the primary database must be explicitly registered using the REGISTER DATABASE command. You do this after connecting RMAN to the recovery catalogand primary database as TARGET.

References: https://docs.oracle.com/database/121/SBYDB/rman.htm#SBYDB4851

QUESTION 46Which two statements are true for Data Guard environments with multi-tenant databases? (Choose two.)

A. Different pluggable databases within a logical standby database may have different guard statuses.


B. The Data Guard broker automatically always opens the pluggable databases of a standby database after a role change operation.C. The Data Guard broker automatically opens all pluggable databases of a primary database a role change operation.D. The CDBDBA privilege must be used instead of the SYSDBA privilege for connections as SYS to the root container of a multi-tenant standby database.E. A multi-tenant standby database can have fewer pluggable databases than the primary container database.

Correct Answer: CDSection: (none)Explanation

Explanation/Reference:Explanation:C: If you execute a switchover or failover operation, the entire CDB undergoes the role change.D: To administer a multitenant environment, you must have the CDB_DBA role.

References: https://docs.oracle.com/database/121/SBYDB/create_ps.htm

QUESTION 47Examine the Data Guard configuration after an accidental switchover to Sheep:



Protection Mode: MaxAvailabilityDatabases:sheep- Primary databasedogs- Logical standby databasecats- Physical standby database (disabled)ORA-16795: the standby database needs to be re-created



Which three will be true after a switchover to Dogs? (Choose three.)

A. Sheep will be a disabled logical standby database.B. Sheep will be an enabled logical standby database.C. Cats will be a disabled physical standby database that can be manually enabled.


D. Cats will be an enabled physical standby database.E. Dogs will be the primary database.



QUESTION 48Which three are among the various tasks performed by the data Guard Monitor (DMON) process? (Choose three.)

A. performing role transitions when switchover requests are madeB. communicating with DMON processes in other database instances that are part of the broker configurationC. activating role-based services appropriately in the various database instances of the configuration, based on the database roleD. communicating with the DMON process of the observer to monitor a primary database in case a fast start failover is required.E. maintaining information about all members of the broker configuration in binary configuration files


Explanation/Reference:Explanation:A: Oracle Enterprise Manager Cloud Control (Cloud Control) works with the Oracle Data Guard monitor to automate and simplify the management of an OracleData Guard configuration.

With Cloud Control, the complex operations of creating and managing standby databases are simplified through Oracle Data Guard management pages andwizards, including:

* A switchover operation that helps you switch roles between the primary database and a standby database.

B (not D): The Oracle Data Guard monitor process (DMON) is an Oracle background process that runs on every database instance that is managed by the broker.

E: The broker's DMON process persistently maintains information about all members of the broker configuration in a binary configuration file.

References: https://docs.oracle.com/database/121/DGBKR/concepts.htm#DGBKR050

QUESTION 49


A Data Guard environment has this configuration and these attributes:

1. A primary database2. A Physical Standby Database named sbdb3. The configuration is in maximum availability protection mode.

Then sbdb is converted to a snapshot standby database.

When two statements are true? (Choose two.)

A. Sdbd can still apply redo.B. The recovery point objective increases.C. The protection mode is lowered to maximum performance.D. The recovery time objective increases.E. Sbdb can still receive redo

Correct Answer: DESection: (none)Explanation

Explanation/Reference:Explanation:E: A snapshot standby database receives and archives, but does not apply, redo data from a primary database.

D: Snapshot standby databases are best used in scenarios where the benefit of having a temporary, updatable snapshot of the primary database justifies additionaladministrative complexity and increased time to recover from primary database failures.

Note: Redo data received from the primary database is applied when a snapshot standby database is converted back into a physical standby database, afterdiscarding all local updates to the snapshot standby database.The data in the primary database is fully protected however, because a snapshot standby can be converted back into a physical standby database at any time, andthe redo data received from the primary will then be applied.

Incorrect Answers:A: A snapshot standby database receives and archives, but does not apply, redo data from a primary database.

References: https://docs.oracle.com/cd/B28359_01/server.111/b28294/manage_ps.htm

QUESTION 50Which three factors can influence the rate of redo apply on a physical standby database? (Choose three.)


A. the network latency between the primary and standby databasesB. the number of archiver processes on the standby databaseC. the number and size of standby redo logs on the primary databaseD. the rate of redo generation on the primary databaseE. the number and size of standby redo logs on the standby database


Explanation/Reference:Explanation:Consider using the following methods to optimize the time it takes to apply redo to physical standby databases.* (B) Set Parallel Recovery to Twice the Number of CPUs on One Standby Host* (E) During media recovery or Redo Apply, the redo log file is read, and data blocks that require redo application are parsed out. With parallel media recovery,these data blocks are subsequently distributed evenly to all recovery processes to be read into the buffer cache. The default is serial recovery or zero parallelism,which implies that the same recovery process reads the redo, reads the data blocks from disk, and applies the redo changes.

References: https://docs.oracle.com/cd/B19306_01/server.102/b14239/manage_ps.htm#BACHIBGG

QUESTION 51You edit the DGConnectIdentifier database property using the edit database set property DGMGRL command.

Which two are effects of this change? (Choose two.)

A. The fal_client database initialization parameter on all standby databases is updated with the new value.B. The service attribute of the log_archive_dest_n initialization parameter for any database referring to the specified database is updated with the new value.C. The fal_client database initialization parameter for the specified database is updated with the new value.D. The broker configuration must be disabled and then enabled to use the new connection property.E. The service attribute of the log_archive_dest_n initialization parameter referring to all standby databases is updated with the new value.


Explanation/Reference:Explanation:B: The DGConnectIdentifier configurable database property specifies the connection identifier the broker uses when making connections to a database.The value of this property is specified in the SERVICE attribute of the LOG_ARCHIVE_DEST_n parameter when the broker configures redo transport services on


the primary database.

A: The connect identifier for a database must allow all other databases in the configuration to reach it.

References: https://docs.oracle.com/cd/E11882_01/server.112/e40771/dbpropref.htm#DGBKR870



Configuration –AnimalsProtection Mode: MaxPerformanceDatabases:dogs- Primary databasesheep- Physical standby databasecats- Snapshot standby database



You receive an error while attempting to raise the protection mode to Maximum Protection:

DGMGRL> edit configuration set protection mode as maxprotection:

Error: ORA-16627: operation disallowed since no standby databases would remain to support protection modeFailed.

What can you conclude based on this error?

A. Cats is a snapshot standby database.B. The redo transport mode is set to ASYNC for the standby database Sheep.C. The redo transport mode is set to ASYNC for both standby databases.D. The redo transport mode is set to ASYNC for the standby database Cats.

Correct Answer: BSection: (none)Explanation


Explanation/Reference:Explanation:Sheep is the Physical standby database.

Error cause: The broker rejects an attempt to change the configuration"s overall protection mode since it could not find any online, enabled standby databases thatsupport the proposed protection mode.

Action: If changing the overall protection mode, confirm that at least one standby database satisfies the new protection mode.

References: http://psoug.org/oraerror/ORA-16627.htm

QUESTION 53Which two statements are true regarding Data Guard Broker? (Choose two.)

A. It automatically adds the primary database to an existing broker configuration when Enterprise Manager Cloud Control is used to create a standby.B. It automatically starts the DMON process for the database instances that are part of a Data Guard configuration.C. It can be used to perform failovers and switchovers.D. It can be used to create and manage standby databases.E. It can be used to monitor redo transport and log apply services.


Explanation/Reference:Explanation:B: The Data Guard monitor process (DMON) is an Oracle background process that runs for every database instance that is managed by the broker. When you startthe Data Guard broker, a DMON process is created.C: The following list describes some of the operations the broker automates and simplifies:* Invoking switchover or failover with a single command to initiate and control complex role changes across all databases in the configuration.Etc.

Incorrect Answers:E: Oracle Enterprise Manager works with the Data Guard monitor to automate and simplify the management of a Data Guard configuration including:* Performance tools and graphs that help you monitor and tune redo transport services and log apply services.

References: https://docs.oracle.com/cd/B28359_01/server.111/b28295/concepts.htm

QUESTION 54You must use a physical standby database file to recover a data file on a primary database in a Data Guard environment.


Which three of these steps must be performed on the primary database after the file has been backed up using RMAN on the physical standby database? (Choosethree.)

A. Connect to the primary database as the AUXILIARY.B. Catalog the data file copy for RMAN to use on the primary database for restore.C. Back up the data file as copy on the standby host to a location on the standby host.D. Switch to the data file copy using the RMAN SWITCH command.E. Back up the data file as copy on the standby host to a location on the primary host.F. Connect to the primary database as the TARGET.

Correct Answer: ABDSection: (none)Explanation

Explanation/Reference:Explanation:You can use files on a standby database to recover a lost datafile.Start RMAN and take the following steps to copy the datafiles from the standby to the primary:

1. Connect to the standby database as the target database2. (A) Connect to the primary database as the auxiliary database3. Back up the datafile on the standby host across the network to a location on the primary host. (This step, E, is assumed to have been taken already).4. Exit the RMAN client5. Start RMAN and connect to the primary database as target, and to the recovery catalog6. (B, D) Use the CATALOG DATAFILECOPY command to catalog this datafile copy so that RMAN can use it.CATALOG DATAFILECOPY '/disk9/df2copy.dbf';Then use the SWITCH DATAFILE command to switch the datafile copy so that /disk9/df2copy.dbf becomes the current datafile:

RUN { SET NEWNAME FOR DATAFILE 2 TO '/disk9/df2copy.dbf'; SWITCH DATAFILE 2;}

References: https://docs.oracle.com/cd/E11882_01/server.112/e41134/rman.htm#SBYDB4870

QUESTION 55You must manually reinstate a database using DGMGRL.

To which database should you connect with DGMGRL before issuing the REINSTATE command and in which state should the target database be?


A. The target database should be in NOMOUNT state and DGMGRL should be connected to any database that is a member of the configuration.B. The target database should be MOUNTED and DGMGRL should be connected to any database that is a member of the configuration.C. The target database should be MOUNTED and DGMGRL should be connected to the primary database.D. The target database should be MOUNTED and DGMGRL should be connected to the target database.E. The target database should be in NOMOUNT state and DGMGRL should be connected to the primary database.


Explanation/Reference:Explanation:To reinstate the failed primary database, start it to the mounted state. Then run DGMGRL, connect to the new primary database and reinstate the old primarydatabase.

References: https://docs.oracle.com/cd/B28359_01/server.111/b28295/cli.htm

QUESTION 56Which two are true about rolling release upgrades in a Data Guard environment? (Choose two.)

A. The background process DMON must be enabled on the primary and standby databases during a rolling release upgrade procedure.B. A physical standby database can be converted to a logical standby database temporarily.C. Rolling release upgrades require the background process RVWR to write flashback logs on the standby database.D. The KEEP IDENTITY clause ensures that a logical standby database keeps the same DBID as the primary database.E. The recovery point objective increases proportionally to the duration of the rolling release upgrade procedure.

Correct Answer: BDSection: (none)Explanation

Explanation/Reference:Explanation:D: Performing a Rolling Upgrade With an Existing Physical Standby DatabaseStep 1 Prepare the primary database for a rolling upgrade (perform these steps on Database A)Step 2 Convert the physical standby database into a logical standby database (perform these steps on Database B)

Includes:issue the following command:


SQL> ALTER DATABASE RECOVER TO LOGICAL STANDBY KEEP IDENTITY;SQL> ALTER DATABASE OPEN;

References: https://docs.oracle.com/database/121/SBYDB/rollup.htm#SBYDB4884


oracle.test4prep.1z0-066.v2019-03-06.by.sherman · 2019-09-29 · you must propose an oracle data...

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