important oracle query & script

QUERIES

STATUS

Startup time

selectto_char(startup_time, 'HH24:MI DD-MON-YY') "Startup time"

fromv$instance

/

How large is the database

col "Database Size" format a20

col "Free space" format a20

col "Used space" format a20

selectround(sum(used.bytes) / 1024 / 1024 / 1024 ) || ' GB' "Database Size"

,round(sum(used.bytes) / 1024 / 1024 / 1024 ) -

round(free.p / 1024 / 1024 / 1024) || ' GB' "Used space"

,round(free.p / 1024 / 1024 / 1024) || ' GB' "Free space"

from (selectbytes from v$datafile

unionall

selectbytes from v$tempfile

union all

selectbytes from v$log) used, (select sum(bytes) as p from dba_free_space) free

group by free.p

/

Distribution of objects and data

Which schemas are taking up all of the spaceset pages 999

col "size MB" format 999,999,999

col "Objects" format 999,999,999

selectobj.owner "Owner",obj_cnt "Objects",decode(seg_size, NULL, 0, seg_size) "size MB"

from (select owner, count(*) obj_cnt from dba_objects group by owner) obj,(select owner, ceil(sum(bytes)/1024/1024) seg_size

from dba_segments group by owner) seg

where obj.owner = seg.owner(+)

orderby 3 desc ,2 desc, 1

/

Show the ten largest objects in the database

Col owner format a15

Col segment_name format a30

Col segment_type format a15

Col mb format 999,999,999

select owner,segment_name,segment_type,mb

from(select owner,segment_name,segment_type,bytes / 1024 / 1024 "MB"

from dba_segments

order by bytes desc

)

whererownum < 11

/

Is java installed in the database?

This will return 9000'ish if it is...select count(*)

from all_objects

where object_type like '%JAVA%'

and owner = 'SYS'

/

Display character set information

select * from nls_database_parameters

/

Show all used features

selectname

,detected_usages

fromdba_feature_usage_statistics

where detected_usages > 0

/

SESSION

Show all connected users

set lines 100 pages 999

col ID format a15

select username,sid || ',' || serial# "ID",status,last_call_et "Last Activity"

from v$session

where username is not null

order by status desc,last_call_et desc

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Time since last user activity


select username

, floor(last_call_et / 60) "Minutes"

, status

from v$session

where username is not null

order by last_call_et

/

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Sessions sorted by logon time


col ID

format a15

col osuserformat a15

col login_timeformat a14

select username

,osuser

,sid || ',' || serial# "ID"

,status

,to_char(logon_time, 'hh24:mi dd/mm/yy') login_time

,last_call_et

fromv$session

whereusername is not null

orderby login_time

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Show user info including os pid

col "SID/SERIAL" format a10

col username format a15

col osuser format a15

col program format a40

selects.sid || ',' || s.serial# "SID/SERIAL"

,s.username

,s.osuser

,p.spid "OS PID"

,s.program

fromv$session s

,v$process p

Wheres.paddr = p.addr

order by to_number(p.spid)

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Show a users current sql

Select sql_text

from v$sqlarea

where (address, hash_value) in

(select sql_address, sql_hash_value

from v$session

where username like '&username')

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Session status associated with the specified os process id

selects.username

,s.sid

,s.serial#

,p.spid

,last_call_et

,status

from V$SESSION s

,V$PROCESS p

wheres.PADDR = p.ADDR

andp.spid='&pid'

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All active sql

set feedback off

set serveroutput on size 9999

column username format a20

column sql_text format a55 word_wrapped

begin

for x in

(select username||'('||sid||','||serial#||') ospid = '|| process ||

' program = ' || program username,

to_char(LOGON_TIME,' Day HH24:MI') logon_time,

to_char(sysdate,' Day HH24:MI') current_time,

sql_address,

sql_hash_value

from v$session

where status = 'ACTIVE'

and rawtohex(sql_address) '00'

and username is not null ) loop

for y in (select sql_text

from v$sqlarea

where address = x.sql_address ) loop

if ( y.sql_text not like '%listener.get_cmd%' and

y.sql_text not like '%RAWTOHEX(SQL_ADDRESS)%' ) then

dbms_output.put_line( '--------------------' );

dbms_output.put_line( x.username );

dbms_output.put_line( x.logon_time || ' ' || x.current_time || ' SQL#=' || x.sql_hash_value);

dbms_output.put_line( substr( y.sql_text, 1, 250 ) );

end if;

end loop;

end loop;

end;

/

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Display any long operations



col message format a40

col remaining format 9999

selectusername

,to_char(start_time, 'hh24:mi:ss dd/mm/yy') started

,time_remaining remaining

,message

fromv$session_longops

wheretime_remaining = 0

order by time_remaining desc

/

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List open cursors per user

set pages 999

select sess.username

,sess.sid

,sess.serial#

,stat.value cursors

fromv$sesstat stat

,v$statname sn

,v$session sess

wheresess.username is not null

andsess.sid = stat.sid

andstat.statistic# = sn.statistic#

andsn.name = 'opened cursors current'

order by value

/

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Or alternatively... set lines 100 pages 999

select count(hash_value) cursors

, sid

, user_name

from v$open_cursor

group by

sid

, user_name

order by

cursors

/

INIT PARAMETERSShow latent parameter changes

select name

, value

from v$parameter

where ismodified != 'FALSE'

/

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Show non-default parameters

set pages 999 lines 100

col name format a30

col value format a50

select name

,value

fromv$parameter

whereisdefault = 'FALSE'

andvalue is not null

orderby name

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or for name='parameter' style...set pages 999 lines 100

select name || '=' || decode(type, 2, '''') || value

|| decode(type, 2, '''') parameter

fromv$parameter

whereisdefault = 'FALSE'

andvalue is not null

orderby name

/

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Reset/Unset a spfile parameter

Setting a parameter to =' ' often isn't enough. Do this instead...alter system reset scope=spfile sid='*'

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The sid='*' bit is always necessary, even in non RAC database.USER

List users


col usernameformat a20

col statusformat a8

col tablespaceformat a20

col temp_tsformat a20

selectusername

,account_status status

,created

,default_tablespace tablespace

,temporary_tablespace temp_ts

fromdba_users

orderby username

/

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Lock or unlock a user

alter user account lock;

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And to unlock...alter user account unlock;

ROLEFind a role

select*

from dba_roles

whererole like '&role'

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Show what roles are granted to a user

selectgrantee

,granted_role

,admin_option

fromdba_role_privs

wheregrantee like upper('&username')

/

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Show what system privileges are granted to a role

selectprivilege

,admin_option

fromrole_sys_privs


/

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Show what table privileges are granted to a role

selectowner || '.' || table_name "TABLE"

,column_name

,privilege

,grantable

fromrole_tab_privs


/

Administration - ASM

Check if css is running/working Display disk-groups Show disk space usage Create a disk group Add a disk to a group Drop a disk group Is ASM performing a balancing operation Check the internal consistency of a diskgroupCheck if css is running/working

crsctl check cssd

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Display disk-groups

set lines 100

col nameformat a10

col path format a30

selectname

,group_number

,disk_number

,mount_status

,state

,path

from v$asm_disk

order by group_number

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note. A group number of zero his indicates that a disk is available but hasn't yet been assigned to a disk group.Show disk space usage

select name

, group_number

, disk_number

, total_mb

, free_mb

from v$asm_disk

order by group_number

/

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Create a disk group

create diskgroup data1

external redundancy

disk '/dev/raw/raw1'

/

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or with multiple raw partitions...multiple disks

create diskgroup data2

external redundancy

disk'/dev/raw/raw2'

,'/dev/raw/raw3'

/

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or with multiple fail groups...create diskgroup data3

normal redundancy

failgroup controller1 disk '/dev/raw/raw4'

failgroup controller2 disk '/dev/raw/raw6'

/

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Add a disk to a group

alter diskgroup data1

add disk '/dev/raw/raw4'

/

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Wildcards can be used for raw device names (eg. raw*)Drop a disk group

drop diskgroup ''

/

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Is ASM performing a balancing operation

select *

from v$asm_operation

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Mount/dismount disk groupsalter diskgroup all mount

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alter diskgroup data1 mount

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alter diskgroup all dismount

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alter diskgroup data1 dismount

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Check the internal consistency of a diskgroup

alter diskgroup data1 check all

/

Administration - RAC 10gR2

Start, stop and check CRS (Cluster Ready Services) Start/stop nodeapps Start/stop asm Start/stop a database (all nodes) Start/stop an individual instance Check the VIP config Change the VIP address, subnetmask or interface Locate the voting disk Retrive OCR (Oracle Cluster Registry) information To prevent a database starting at boot time Change the private interconnect subnetStart, stop and check CRS (Cluster Ready Services)

Note. Start/stop need to be run as root from the CRS home.

Start CRScrsctl start crs

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Stop CRScrsctl stop crs

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Check CRS's statuscrsctl check crs

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See the status of the various servicescrs_stat -t

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Start/stop nodeapps

srvctl start nodeapps -n

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srvctl stop nodeapps -n

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Start/stop asm

srvctl start asm -n

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srvctl stop asm -n

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Start/stop a database (all nodes)

srvctl start database -d

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srvctl stop database -d

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Start/stop an individual instance

srvctl start instance -d -i

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srvctl stop instance -d -i

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Check the VIP config

srvctl config nodeapps -n -a -g -s -l

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Change the VIP address, subnetmask or interface



srvctl modify nodeapps -n -A //

srvctl modify nodeapps -n -A //



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Locate the voting disk

crsctl query css votedisk

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Retrive OCR (Oracle Cluster Registry) information

ocrcheck

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To prevent a database starting at boot time

srvctl disable database -d

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Change the private interconnect subnet

First find the interface which is in use as the interconnect - run as root from the crs home:oifcfg getif

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Make a note of the interface name (eth1 in the following example), thenrun the following:oifcfg delif -global eth1

oifcfg setif -global eth1/:cluster_interconnect

Administration - Job Scheduler

List scheduled jobs Submit a job Remove a job Reset a broken job Add a program to the 10g scheduler (os program) Add a program to the 10g scheduler (stored procedure) Schedule a 10g jobList scheduled jobs


colschema_user format a15

colfails format 999

selectjob

,schema_user

,to_char(last_date, 'hh24:mi dd/mm/yy') last_run

,to_char(next_date, 'hh24:mi dd/mm/yy') next_run

,failures fails

,broken

,substr(what, 1, 15) what

fromdba_jobs

order by 4

/

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Submit a job

dbms_job.submit('', , , TRUE);

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For example:declare

job_id number;

begin

dbms_job.submit(

job_id

,'andy.daily_data_clense'

,trunc(sysdate+1)+22/24

,'sysdate+1'

,true);

end;

/

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This will run a stored procedure called 'daily_data_clense' each day at 10pm.Remove a job

You need to be connected as the user who owns the jobexec dbms_job.remove();

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Reset a broken job

You need to be connected as the user who owns the jobexec dbms_job.broken(, FALSE);

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Add a program to the 10g scheduler (os program)

begin

dbms_scheduler.create_program(

program_name=>'ANDY.job_test',

program_action=>'/home/oracle/andyb/job_test.sh',

program_type=>'EXECUTABLE',

comments=>'test job',

enabled=>TRUE);

end;

/

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Add a program to the 10g scheduler (stored procedure)

begin

dbms_scheduler.create_program(

program_name=>'ANDY.job_test',

program_action=>'andy.job_test',

program_type=>'STORED_PROCEDURE',

comments=>'test program',

enabled=>TRUE);

end;

/

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Schedule a 10g job

begin

dbms_sheduler.create_job(

job_name=>'andy.andy_job_test',

program_name=>'andy.job_test',

start_date=>

)

Administration - Recycle bin

Display the contents of the recycle bin Empty the recycle bin Drop an object with out putting it in the recycle binDisplay the contents of the recycle bin

show recyclebin

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Empty the recycle bin

purge recyclebin

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Drop an object with out putting it in the recycle bin

drop purge;

Structure - Tablespace

Tablespace usage Show the files that comprise a tablespace Tablespaces >80% full User quotas on all tablespaces List all objects in a tablespace Show all tablespaces used by a user Create a temporary tablespace Alter a databases default temporary tablespace Show segments that are approaching max_extents List the contents of the temporary tablespace(s)Tablespace usage

set pages 999

col tablespace_name format a40

col "size MB" format 999,999,999

col "free MB" format 99,999,999

col "% Used" format 999

select tsu.tablespace_name, ceil(tsu.used_mb) "size MB"

,decode(ceil(tsf.free_mb), NULL,0,ceil(tsf.free_mb)) "free MB"

,decode(100 - ceil(tsf.free_mb/tsu.used_mb*100), NULL, 100,

100 - ceil(tsf.free_mb/tsu.used_mb*100)) "% used"

from(select tablespace_name, sum(bytes)/1024/1024 used_mb

from dba_data_files group by tablespace_name union all

select tablespace_name || ' **TEMP**'

,sum(bytes)/1024/1024 used_mb

from dba_temp_files group by tablespace_name) tsu

,(select tablespace_name, sum(bytes)/1024/1024 free_mb

from dba_free_space group by tablespace_name) tsf

wheretsu.tablespace_name = tsf.tablespace_name (+)

orderby 4

/

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Show the files that comprise a tablespace

set lines 100

col file_name format a70

select file_name

, ceil(bytes / 1024 / 1024) "size MB"

from dba_data_files

where tablespace_name like '&TSNAME'

/

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Tablespaces >80% full



col "size MB" format 999999999

col "% Used" format 999

col "80%" format 999999

col "75%" format 999999

select tsu.tablespace_name

, ceil(tsu.used_mb) "size MB"

, 100 - floor(tsf.free_mb/tsu.used_mb*100) "% Used"

, (tsu.used_mb / 100) * (20 - floor(tsf.free_mb/tsu.used_mb*100)) "80%"

, (tsu.used_mb / 100) * (25 - floor(tsf.free_mb/tsu.used_mb*100)) "75%"

from (select tablespace_name, sum(bytes)/1024/1024 used_mb

from dba_data_files group by tablespace_name) tsu

, (select tablespace_name, sum(bytes)/1024/1024 free_mb

from dba_free_space group by tablespace_name) tsf

where tsu.tablespace_name = tsf.tablespace_name (+)

and 100 - floor(tsf.free_mb/tsu.used_mb*100) >= 80

order by 3,4,5

/

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User quotas on all tablespaces

col quota format a10

select username

, tablespace_name

, decode(max_bytes, -1, 'unlimited'

, ceil(max_bytes / 1024 / 1024) || 'M' ) "QUOTA"

from dba_ts_quotas

where tablespace_name not in ('TEMP')

/

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List all objects in a tablespace

set pages 999

col owner format a15

col segment_name format a40

col segment_type format a20

select owner

, segment_name

, segment_type

from dba_segments

where lower(tablespace_name) like lower('%&tablespace%')

order by owner, segment_name

/

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Show all tablespaces used by a user

selecttablespace_name

,ceil(sum(bytes) / 1024 / 1024) "MB"

fromdba_extents

whereowner like '&user_id'

group by tablespace_name

order by tablespace_name

/

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Create a temporary tablespace

create temporary tablespace temp

tempfile '' size 500M

/

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Alter a databases default temporary tablespace

alter database default temporary tablespace temp

/

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Show segments that are approaching max_extents

colsegment_name format a40

selectowner

,segment_type

,segment_name

,max_extents - extents as "spare"

,max_extents

fromdba_segments

whereowner not in ('SYS','SYSTEM')

and(max_extents - extents) < 10

order by 4

/

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To change maxextentsalter storage(maxextents 150);

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List the contents of the temporary tablespace(s)



col mb format 999,999

select su.username

, ses.sid

, ses.serial#

, su.tablespace

, ceil((su.blocks * dt.block_size) / 1048576) MB

from v$sort_usage su

, dba_tablespaces dt

, v$session ses

where su.tablespace = dt.tablespace_name

and su.session_addr = ses.saddr

/

Structure - Objects

Find an object Invalid objects Show the size of an object All objects owned by a user Source code of a procedure Get an objects ddl (9i onwards) Display compilation errors and warnings Find all tables containing the specified column List all tables owned by a user sorted by sizeFind an object

set pages 999

col owner format a15

col object_name format a40

col object_type format a20

select owner

, object_name

, object_type

from dba_objects

where lower(object_name) like lower('%&object%')

order by owner, object_type, object_name

/

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Invalid objects

List invalid objects... set lines 200 pages 999

col "obj" format a40

select owner || '.' || object_name "obj",

object_type

from dba_objects

where status = 'INVALID'

/

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Recompile all invalid objects...@?/rdbms/admin/utlrp.sql

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Show the size of an object

col segment_name format a20

select segment_name

, bytes "SIZE_BYTES"

, ceil(bytes / 1024 / 1024) "SIZE_MB"

from dba_segments

where segment_name like '&obj_name'

/

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All objects owned by a user

col object_name format a40

select object_name

, object_type

from dba_objects

where owner = '&user'

order by object_type, object_name

/

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Source code of a procedure

select text

from dba_source

where owner = 'ANDY'

and name = 'FILE_TEST'

and type = 'PACKAGE BODY'

order by line

/

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Get an objects ddl (9i onwards)

Note. Works for 9i and newer.Parameters: OBJECT_TYPE, OBJECT_NAME, SCHEMAset pagesize 0

set long 90000

select dbms_metadata.get_ddl('TABLE','TABLE_A','ANDY') from dual;

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Display compilation errors and warnings

show errors

show errors view

show errors procedure

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select * from dba_errors;

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Find all tables containing the specified column


col tabformat a60

col column_name format a20

selectowner || '.' || table_name as tab

,column_name

fromdba_tab_columns

wherecolumn_name like upper('&col')

/

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List all tables owned by a user sorted by size


colsegment_nameformat a40

col mb

format 999,999,999

selectsegment_name

,ceil(sum(bytes) / 1024 / 1024) "MB"

fromdba_segments

whereowner like '&user'

andsegment_type = 'TABLE'

groupby segment_name

order by ceil(sum(bytes) / 1024 / 1024) desc

/

Structure - Indexes

Index info by table Show indexed columnsIndex info by table

selecti.index_name

,i.tablespace_name

,ceil(s.bytes / 1048576) "Size MB"

from dba_indexes i

,dba_segments s

where i.index_name = s.segment_name

and table_name like '&table'

order by 2, 1

/

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Show indexed columns

select column_name

from dba_ind_columns

where index_name = '&index'

order by column_position

/

Structure - Files

Display all datafiles, tempfiles and logfiles (and their sizes) Quick datafile health check Show directories that contain datafiles List autoextensible datafiles Turn autoextend off for all datafiles Move files between disks List controlfiles Create an OS command for every file in the database Find duplicate filenames List files that are in hot-backup modeDisplay all datafiles, tempfiles and logfiles (and their sizes)


col name format a50

selectname, bytes

from (selectname, bytes

fromv$datafile

unionall

selectname, bytes

from v$tempfile

union all

select lf.member "name", l.bytes

fromv$logfile lf

,v$log l

wherelf.group# = l.group#

union all

selectname, 0

fromv$controlfile) used

,(select sum(bytes) as p

from dba_free_space) free

/

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Quick datafile health check

You should only see online and system (maybe read-only too)select distinct status from v$datafile

/

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Show directories that contain datafiles

selectdistinct substr(name, 1, instr(name, '/', -1)) DIR

fromv$datafile

order by 1

/

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List autoextensible datafiles

selectfile_name

fromdba_data_files

whereautoextensible = 'YES'

/

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Turn autoextend off for all datafiles

select 'alter database datafile ''' || file_name || ''' autoextend off;'

from dba_data_files

/

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Move files between disks

set trimspool on wrap off

set heading off

set verify off


spool rename.sql

select 'alter database rename file ''' ||

name || ''' to ''' ||

replace(name || ''';', '/u01', '/u02')

from v$datafile

/

select 'alter database rename file ''' ||

member || ''' to ''' ||

replace(member || ''';', '/u01', '/u02')

from v$logfile

/

spool off

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List controlfiles

selectname

fromv$controlfile

/

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Create an OS command for every file in the database

The example deletes all filesselect'rm ' || name

from(selectname

fromv$datafile

unionall

selectname

from v$tempfile

union all

select member

from v$logfile

union all

select name

from v$controlfile

)

/

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Find duplicate filenames

Searches for files with the same name in all directoriesselect count(substr(name, instr(name, '/', -1) + 1, 999)) "total"

,count(distinct substr(name, instr(name, '/', -1) + 1, 999)) "distinct"

from v$datafile

/

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List files that are in hot-backup mode


col name format a60

selectdf.name

,b.status

,to_char(time, 'hh24:mi:ss dd/mm/yyyy') time

fromv$datafiledf

,v$backupb

wheredf.file# = b.file#

andb.status = 'ACTIVE'

order by b.file#

/

Structure - Redo Logs

Remove drop add logfile members List members and sizesRemove drop

alter database drop logfile member '';

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add logfile members

alter database add logfile member '' to group ;

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List members and sizes

col memberformat a60

col "Size MB"format 9,999,999

selectlf.member

,ceil(lg.bytes / 1024 / 1024) "Size MB"

fromv$logfile lf

,v$log lg

wherelg.group# = lf.group#

orderby 1

/

Structure - Undo

Converting from Rollback to Undo Display the rollback segments Alter undo retention What's in undo Is anything rolling back at the moment?Display the rollback segments

selectsegment_name

,status

fromdba_rollback_segs

/

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Alter undo retention

alter system set undo_retention=500 scope=memory;

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Note. This is in seconds What's in undo

selecttablespace_name

,status

,count(*) as HOW_MANY

fromdba_undo_extents

groupby tablespace_name

,status

/

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Is anything rolling back at the moment?

Look for the used_ublk value decreasing. If it is, the session connected with it is rolling back. When it reaches zero, rollback is complete.set lines 100 pages 999


col command format a20

selectses.username

,substr(ses.program, 1, 19) command

,tra.used_ublk

fromv$session ses

,v$transaction tra

whereses.saddr = tra.ses_addr

/

Structure - Constraints

Show all constraints on a table List tables that are using the specified table as a foreign key Produce a list of disabled fk constraints Produce enable statements all disabled fk constraints List parent tables that may need fixing/re-importing List missing foriegn key values Show all table constraints for a userShow all constraints on a table

col type format a10

col cons_name format a30

selectdecode(constraint_type,

'C', 'Check',

'O', 'R/O View',

'P', 'Primary',

'R', 'Foreign',

'U', 'Unique',

'V', 'Check view') type

,constraint_name cons_name

,status

,last_change

fromdba_constraints

whereowner like '&owner'

andtable_name like '&table_name'

order by 1

/

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List tables that are using the specified table as a foreign key


selecta.owner

,a.table_name

,a.constraint_name

fromdba_constraints a

,dba_constraints b

wherea.constraint_type = 'R'

and a.r_constraint_name = b.constraint_name

and a.r_owner = b.owner

and b.owner = '&table_owner'

andb.table_name = '&table_name'

/

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Same as above, but produces 'disable constraint' statementsset lines 100 pages 999

col discon format a100

select 'alter table '||a.owner||'.'||a.table_name||' disable constraint

'||a.constraint_name||';' discon

fromdba_constraints a

,dba_constraints b

wherea.constraint_type = 'R'

and a.r_constraint_name = b.constraint_name

anda.r_owner = b.owner

and b.owner = '&table_owner'

andb.table_name = '&table_name'

/

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Produce a list of disabled fk constraints


coltable format a60

colconstraint_name format a30

selectowner||'.'||table_name "table"

,constraint_name

fromdba_constraints

wherestatus = 'DISABLED'

andconstraint_type = 'R'

andowner not in ('SYS','SYSTEM')

order by 1,2

/

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Produce enable statements all disabled fk constraints


select'alter table '||owner||'.'||table_name||' enable constraint

'||constraint_name||';' "enable"

fromdba_constraints

wherestatus = 'DISABLED'

andconstraint_type = 'R'

andowner not in ('SYS','SYSTEM')

order by 1

/

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List parent tables that may need fixing/re-importing

selectdistinct r.owner || '.' || r.table_name "exp"

fromdba_constraints c

,dba_constraints r

wherec.status = 'DISABLED'

andc.constraint_type = 'R'

andc.r_owner = r.owner

andc.r_constraint_name = r.constraint_name

andc.owner not in ('SYS','SYSTEM')

order by 1

/

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List missing foriegn key values

Note. Useful for resolving ORA-02298select 'select '||cc.column_name-

||' from '||c.owner||'.'||c.table_name-

||' a where not exists (select ''x'' from '-

||r.owner||'.'||r.table_name-

||' where '||rc.column_name||' = a.'||cc.column_name||')'

from dba_constraints c,

dba_constraints r,

dba_cons_columns cc,

dba_cons_columns rc

where c.constraint_type = 'R'

and c.owner not in ('SYS','SYSTEM')

and c.r_owner = r.owner

and c.owner = cc.owner

and r.owner = rc.owner

and c.constraint_name = cc.constraint_name

and r.constraint_name = rc.constraint_name

and c.r_constraint_name = r.constraint_name

and cc.position = rc.position

and c.owner = '&table_owner'

and c.table_name = '&table_name'

and c.constraint_name = '&constraint_name'

order by c.owner, c.table_name, c.constraint_name, cc.position

/

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Show all table constraints for a user

Note. This still needs some work...set lines 100 pages 999

break on table_name

select table_name

,decode(constraint_type,

'C', 'Check',

'O', 'R/O View',

'P', 'Primary',

'R', 'Foreign',

'U', 'Unique',

'V', 'Check view') type

,nvl(index_name, R_CONSTRAINT_NAME) "IDX"

from dba_constraints

whereowner like '&user'

orderby table_name

,decode(constraint_type,

'P','0','R','1','U','2','C','3','O','4','V','5')

/

Structure - Materialized view

Create a view log for the master table List all materialized view logs Create a simple materialized view Show all materialized and resfresh times Show materialized view tables and masters Show refresh jobs in dba_jobs Manually start a refresh Force a complete refreshCreate a view log for the master table

This is required for fast refreshcreate materialized view log on

/

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or...create materialized view log on

tablespace

/

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List all materialized view logs

select log_owner

,log_table

fromdba_mview_logs

/

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Create a simple materialized view

create materialized view andy_mview

refresh [fast | complete | force]

start with sysdate

next sysdate + 1/24

with primary key

as select * from test_table

/

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Fast = update changes onlyComplete = wipe and repopulate the mviewForce = fast if possible, complete if not.Show all materialized and resfresh times


col last_refresh format a20

selectowner

,mview_name

,to_char(last_refresh_date, 'dd/mm/yy hh24:mi') last_refresh

fromdba_mviews

order by owner, last_refresh

/

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Show materialized view tables and masters

set lines 100

col mview format a40

col master format a40

selectowner || '.' || name mview

,master_owner || '.' || master master

fromdba_mview_refresh_times

/

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Show refresh jobs in dba_jobs

This is useful for spotting failuresset lines 100

col job format 9999

col log_user format a15

col last format a15

col next format a15

col fail format 9999

col what format a20

selectjob

,log_user

,to_char(last_date, 'dd/mm/yy hh24:mi') last

,to_char(next_date, 'dd/mm/yy hh24:mi') next

,failures fail

,replace(what, '"') what

fromdba_jobs

wherewhat like '%dbms_refresh.refresh%'

/

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Manually start a refresh

execute dbms_mview.refresh ('');

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Force a complete refresh

execute dbms_mview.refresh ('','C');

Structure - Partitions

List partitioned tables List a tables partitions Show partition sizes for the specified table Move a partition to a new tablespace Add a partition Split a partition Drop a partition Truncate a partitionList partitioned tables


col table_name format a40

selecttable_name

,partitioning_type type

,partition_count partitions

fromdba_part_tables

whereowner = '&owner'

order by 1

/

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List a tables partitions


col high_value format a20


selectpartition_name

,tablespace_name

,high_value

fromdba_tab_partitions

wheretable_owner = '&owner'

andtable_name = '&table_name'

order by partition_position

/

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Show partition sizes for the specified table



col num_rows format 999,999,999

selectp.partition_name

,p.tablespace_name

,p.num_rows

,ceil(s.bytes / 1024 / 1204) mb

fromdba_tab_partitions p

,dba_segments s

wherep.table_owner = s.owner

andp.partition_name = s.partition_name

and p.table_name = s.segment_name

andp.table_owner = '&owner'

andp.table_name = '&table_name'

order by partition_position

/

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Move a partition to a new tablespace

alter table

move partition

tablespace

nologging

/

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Add a partition

alter table

add partition values less than ()

tablespace

/

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or...alter table

add partition values ()

tablespace

/

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Split a partition

alter table

split partition at ()

into (partition , partition )

update global indexes

/

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Drop a partition

alter table drop partition

/

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Truncate a partition

alter table truncate partition

/

Performance - General

Show currently exectuing sql Session statistics Resource intensive sql File io stats In session tracing switch on event 10046 Rows per block Show the buffer cache advisoryShow currently exectuing sql

select sql_text

from v$sqlarea

where users_executing > 0

/

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Session statistics

selectsn.name

,st.value

fromv$sesstat st

,v$statname sn

wherest.STATISTIC# = sn.STATISTIC#

andst.VALUE > 0

andst.SID = &SID

order by value desc

/

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Resource intensive sql

change 8192 to match block size select sql_text

, executions

, to_char((((disk_reads+buffer_gets)/executions) * 8192)/1048576, '9,999,999,990.00')

as total_gets_per_exec_mb

, to_char((( disk_reads /executions) * 8192)/1048576, '9,999,999,990.00')

as disk_reads_per_exec_mb

, to_char((( buffer_gets /executions) * 8192)/1048576, '9,999,999,990.00')

as buffer_gets_per_exec_mb

, parsing_user_id

from v$sqlarea

where executions > 10

order by 6 desc

/

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File io stats

Requires timed_statistics=trueset lines 80 pages 999

col fname heading "File Name" format a60

col sizemb heading "Size(Mb)" format 99,999

col phyrds heading "Reads" format 999,999,999

col readtim heading "Time" format 99.999

col phywrts heading "Writes" format 9,999,999

col writetim heading "Time" format 99.999

select lower(name) fname

, (bytes / 1048576) sizemb

, phyrds

,readtim

, phywrts

,writetim

from v$datafile df

, v$filestat fs

where df.file# = fs.file#

order by 1

/

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In session tracing

To switch it on:exec dbms_system.set_sql_trace_in_session (, , true);

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To switch it off:exec dbms_system.set_sql_trace_in_session (, , false);

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switch on event 10046

To switch it on:alter session set events '10046 trace name context forever, level 8';

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To switch it off:alter session set events '10046 trace name context off';

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Note. use tkprof to interpret the results. Rows per block

select avg(row_count) avg

, max(row_count) max

, min(row_count) min

from (

select count(*) row_count

from &table_name

group by substr(rowid, 1, 15)

)

/

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Show the buffer cache advisory

Note. The current setting is halfway down and has a read factor of one.set lines 100 pages 999

col est_mb format 99,999

col estd_physical_reads format 999,999,999,999,999

selectsize_for_estimate est_mb

,estd_physical_read_factor

,estd_physical_reads

fromv$db_cache_advice

wherename = 'DEFAULT'

order by size_for_estimate

/

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db_cache_advice needs to be on for the above to workalter system set db_cache_advice=on;

Performance - Locks DML

Show sessions that are blocking each other Show locked objects Show which row is locked List locksShow sessions that are blocking each other

select'SID ' || l1.sid ||' is blocking ' || l2.sid blocking

fromv$lock l1, v$lock l2

wherel1.block =1 and l2.request > 0

andl1.id1=l2.id1

andl1.id2=l2.id2

/

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Show locked objects



col sess_id format a10

col objectformat a25

col mode_heldformat a10

selectoracle_username || ' (' || s.osuser || ')' username

,s.sid || ',' || s.serial# sess_id

,owner || '.' ||object_name object

,object_type

,decode(l.block

,0, 'Not Blocking'

,1, 'Blocking'

,2, 'Global') status

,decode(v.locked_mode

,0, 'None'

,1, 'Null'

,2, 'Row-S (SS)'

,3, 'Row-X (SX)'

,4, 'Share'

,5, 'S/Row-X (SSX)'

,6, 'Exclusive', TO_CHAR(lmode)) mode_held

fromv$locked_object v

,dba_objects d

,v$lock l

,v$session s

where v.object_id = d.object_id

and v.object_id = l.id1

and v.session_id = s.sid

order by oracle_username

,session_id

/

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Show which row is locked

selectdo.object_name

,row_wait_obj#

,row_wait_file#

,row_wait_block#

,row_wait_row#

,dbms_rowid.rowid_create (1, ROW_WAIT_OBJ#, ROW_WAIT_FILE#,

ROW_WAIT_BLOCK#, ROW_WAIT_ROW#)

fromv$session s

,dba_objects do

wheresid=&sid

and s.ROW_WAIT_OBJ# = do.OBJECT_ID

/

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Then select the row with that rowid...select * from where rowid=;

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List locks

column lock_type format a12

column mode_held format a10

column mode_requested format a10

column blocking_others format a20

column username format a10

SELECTsession_id

,lock_type

,mode_held

,mode_requested

,blocking_others

,lock_id1

FROMdba_lock l

WHERE lock_type NOT IN ('Media Recovery', 'Redo Thread')

/

Performance - Locks DDL

Show all ddl locks in the system Slightly more simple version of the above Generate kill statement for ddl locking sessionsShow all ddl locks in the system

selectdecode(lob.kglobtyp,

0, 'NEXT OBJECT', 1, 'INDEX', 2, 'TABLE', 3, 'CLUSTER',

4, 'VIEW', 5, 'SYNONYM', 6, 'SEQUENCE',

7, 'PROCEDURE', 8, 'FUNCTION', 9, 'PACKAGE',

11, 'PACKAGE BODY', 12, 'TRIGGER',

13, 'TYPE', 14, 'TYPE BODY',

19, 'TABLE PARTITION', 20, 'INDEX PARTITION', 21, 'LOB',

22, 'LIBRARY', 23, 'DIRECTORY', 24, 'QUEUE',

28, 'JAVA SOURCE', 29, 'JAVA CLASS', 30, 'JAVA RESOURCE',

32, 'INDEXTYPE', 33, 'OPERATOR',

34, 'TABLE SUBPARTITION', 35, 'INDEX SUBPARTITION',

40, 'LOB PARTITION', 41, 'LOB SUBPARTITION',

42, 'MATERIALIZED VIEW',

43, 'DIMENSION',

44, 'CONTEXT', 46, 'RULE SET', 47, 'RESOURCE PLAN',

48, 'CONSUMER GROUP',

51, 'SUBSCRIPTION', 52, 'LOCATION',

55, 'XML SCHEMA', 56, 'JAVA DATA',

57, 'SECURITY PROFILE', 59, 'RULE',

62, 'EVALUATION CONTEXT','UNDEFINED'

) object_type

,lob.kglnaobj object_name

,pn.kglpnmod lock_mode_held

,pn.kglpnreq lock_mode_requested

,ses.sid

,ses.serial#

,ses.username

fromv$session_waitvsw

,x$kglob

lob

,x$kglpn

pn

,v$sessionses

wherevsw.event = 'library cache lock'

andvsw.p1raw = lob.kglhdadr

andlob.kglhdadr = pn.kglpnhdl

andpn.kglpnmod != 0

andpn.kglpnuse = ses.saddr

/

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Slightly more simple version of the above

selectses.username

,ddl.session_id

,ses.serial#

,owner || '.' || ddl.name object

,ddl.type

,ddl.mode_held

fromdba_ddl_locks ddl

,v$session ses

whereowner like '%userid%'

andddl.session_id = ses.sid

/

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Generate kill statement for ddl locking sessions

select'alter system kill session ''' || ddl.session_id || ',' || ses.serial# || ''' immediate;'

fromdba_ddl_locks ddl

,v$session ses

whereowner like '%userid%'

andddl.session_id = ses.sid

/

Performance - Waits

Top ten hotest objects by touch count Waits by file Segment Waits Time waited for latches Identify hot blocks Look at the performance stats for the instanceTop ten hotest objects by touch count

col owner format a20 trunc

col object_nameformat a30

col touches format 9,999,999

select*

from(

selectcount(*)

,sum(tch) TOUCHES

,u.name OWNER

,o.name OBJECT_NAME

from x$bh x

,obj$ o

,user$ u

wherex.obj = o.obj#

ando.owner# = u.user#

group by u.name, o.name

order by 2 desc

)

whererownum < 11

/

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Waits by file

col name format a60

selectname

,count

fromx$kcbfwait

,v$datafile

whereindx + 1 = file#

orderby 2

/

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Segment Waits

selectobject_name

,obj#

,statistic_name

,value

fromv$segment_statistics

whereowner like '&owner'

andstatistic_name like '%waits%'

andvalue > 0

orderby statistic_name

, value desc

/

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Time waited for latches

col event format a30

selectevent

,time_waited

,round(time_waited*100/ SUM (time_waited) OVER(),2) wait_pct

from(

selectevent

,time_waited

fromv$system_event

whereevent not in (

'Null event'

,'client message'

,'rdbms ipc reply'

,'smon timer'

,'rdbms ipc message'

,'PX Idle Wait'

,'PL/SQL lock timer'

,'file open'

,'pmon timer'

,'WMON goes to sleep'

,'virtual circuit status'

,'dispatcher timer'

,'SQL*Net message from client'

,'parallel query dequeue wait'

,'pipe get')

union

(

selectname

,

value

fromv$sysstat

where name like 'CPU used when call started'

)

)

order by 2 desc

/

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Identify hot blocks

Look at all waits for the instancecol event format a30

select event

,total_waits

,time_waited

fromv$system_event

whereevent like '%wait%'

order by 2,3

/

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If there are lots of 'data block' waits, get a break-down of themselect*

fromv$waitstat

/

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Then run this to identify the file, block and reason code...selectp1 "File #"

,p2 "Block #"

,p3 "Reason Code"

fromv$session_wait

whereevent = 'buffer busy waits'

/

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Note. You might need to run this a few times before anything is displayed.Look at the performance stats for the instance

selectn.name

,s.value

fromv$statname n

,v$sysstat s

wheren.statistic# = s.statistic#

order by n.class

,n.name

/

Performance - Statistics

Gather database statistics Gather stats for a single schema... Delete stats Gather system stats Export/Import optimizer statistics Old style analyze Show a count of analyezed tables broken down by schema Show tables that have analyze dates older than todayGather database statistics

Gather stats on the entire database...execute dbms_stats.gather_database_stats;

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Or...execute dbms_stats.gather_database_stats( -

estimate_percent => 1, -

method_opt => 'FOR ALL COLUMNS SIZE 1',-

cascade => TRUE);

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Gather stats for a single schema...

execute dbms_stats.gather_schema_stats('SCOTT');

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Or...execute dbms_stats.gather_schema_stats( -

ownname => 'SCOTT', -

estimate_percent => 1, -

method_opt => 'FOR ALL COLUMNS SIZE 1',-

cascade => TRUE);

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You can let oracle come up with the estimate figure by using dbms_stats.auto_sample_size

or...execute dbms_stats.gather_schema_stats( -

ownname => 'SYS', -

cascade => TRUE);

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Table statisticsexec dbms_stats.gather_table_stats('', '');

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Delete stats

exec dbms_stats.delete_database_stats;

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exec dbms_stats.delete_schema_stats('SCOTT');

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exec dbms_stats.delete_table_stats('SCOTT', 'EMPLOYEES');

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exec dbms_stats.delete_index_stats('SCOTT', 'EMPLOYEES_PK');

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Gather system stats

execute dbms_stats.gather_system_stats('Start');

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Wait for a while - idealy with the database under a typical workloadexecute dbms_stats.gather_system_stats('Stop');

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To see the current system statisticsselectpname

,pval1

from sys.aux_stats$

where sname = 'SYSSTATS_MAIN'

/

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Export/Import optimizer statistics

Create a table to hold the statistics... exec dbms_stats.create_stat_table(ownname => 'SYS',-

stattab => 'prod_stats', tblspace => 'USERS');

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Populate the table with the current stats... exec dbms_stats.export_schema_stats(ownname => 'SCOTT',-

statown=>'SYS', stattab=>'prod_stats');

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At this point you need to:1) take an export of the 'prod_stats' table2) import 'prod_stats' into the target database3) load the statistics using this command... exec dbms_stats.import_schema_stats(ownname => 'SCOTT',-

statown=>'SYS', stattab=>'prod_stats');

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Old style analyze

analyze table employees compute statistics;

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analyze table employees estimate statistics sample 100 rows;

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analyze table employees estimate statistics sample 15 percent;

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analyze index employees_ind compute statistics;

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Show a count of analyezed tables broken down by schema


selecta.owner

,a.total_tables tables

,nvl(b.analyzed_tables,0) analyzed

from(selectowner

,count(*) total_tables

fromdba_tables

groupby owner) a

,(selectowner

,count(last_analyzed) analyzed_tables

fromdba_tables

wherelast_analyzed is not null

groupby owner) b

wherea.owner = b.owner (+)

anda.owner not in ('SYS', 'SYSTEM')

orderby a.total_tables - nvl(b.analyzed_tables,0) desc

/

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Show tables that have analyze dates older than today

This is useful if you are running an analyze and want to see how much is left to doselectcount(last_analyzed) left_to_do

fromdba_tables

whereowner = '&schema'

andtrunc(last_analyzed) < trunc(sysdate)

orderby 1

/

Performance - Query Tuning

Create a plan table Autotrace Explain plan Find a query's hash Grab the sql associated with a hash Look at a query's stats in the sql areaCreate a plan table

@?/rdbms/admin/utlxplan.sql

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Autotrace

To switch it on:column plan_plus_exp format a100

set autotrace on explain # Displays the execution plan only.

set autotrace traceonly explain # dont run the query

set autotrace on # Shows the execution plan as well as statistics of the statement.

set autotrace on statistics # Displays the statistics only.

set autotrace traceonly # Displays the execution plan and the statistics

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To switch it off:set autotrace off

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Explain plan

explain plan for

select ...

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or...explain plan set statement_id = 'bad1' for

select...

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Then to see the output...set lines 100 pages 999

@?/rdbms/admin/utlxpls

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Find a query's hash

Put something unique in the like clauseselect hash_value, sql_text

from v$sqlarea

where sql_text like '%TIMINGLINKS%FOLDERREF%'

/

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Grab the sql associated with a hash

select sql_text

from v$sqlarea

where hash_value = '&hash'

/

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Look at a query's stats in the sql area

selectexecutions

,cpu_time

,disk_reads

,buffer_gets

,rows_processed

,buffer_gets / executions

fromv$sqlarea

wherehash_value = '&hash'

/

Performance - Memory

SGA breakdown PGA usage by username Display pool usageSGA breakdown


col bytes format 999,999,999

computesum of bytes on pool

break on pool skip 1

selectpool

,name

,bytes

from v$sgastat

order by pool

,name

/

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PGA usage by username

selectst.sid "SID",

sn.name "TYPE",

ceil(st.value / 1024 / 1024) "MB"

fromv$sesstat st,

v$statname sn

wherest.statistic# = sn.statistic#

and sid in(select sid

from v$session

where username like '&user')

andupper(sn.name) like '%PGA%'

order by st.sid,

st.value desc

/

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Display pool usage

selectname

,sum(bytes)

fromv$sgastat

wherepool like 'shared pool'

group by name

/

Performance - Statspack

Take a snapshot Delete one or more snapshots Generate a report List snapshots Install statspack Uninstall statspack Schedule and hourly snapshotTake a snapshot

exec statspack.snap;

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Or to specify a level...exec statspack.snap(i_snap_level => 6, i_modify_parameter => 'true');

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Level 0 - This level captures general statistics, including rollback segment, row cache, SGA, system events, background events, session events, system statistics, wait statistics, lock statistics, and Latch information.

Level 5 - This level includes capturing high resource usage SQL Statements, along with all data captured by lower levels.

Level 6 - This level includes capturing SQL plan and SQL plan usage information for high resource usage SQL Statements, along with all data captured by lower levels.

Level 7 - This level captures segment level statistics, including logical and physical reads, row lock, itl and buffer busy waits, along with all data captured by lower levels.

Level 10 - This level includes capturing Child Latch statistics, along with all data captured by lower levels. Delete one or more snapshots

@?/rdbms/admin/sppurge;

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Generate a report

@?/rdbms/admin/spreport.sql

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List snapshots

col "Date/Time" format a30

selectsnap_id

, snap_level

,to_char(snap_time,'HH24:MI:SS DD-MM-YYYY') "Date/Time"

fromstats$snapshot

,v$database

order by snap_id

/

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Install statspack

1. Create a tablespace (minimum size 100MB)2. Run...@?/rdbms/admin/spcreate

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Uninstall statspack

@?/rdbms/admin/spdrop

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Schedule and hourly snapshot

@?/rdbms/admin/spauto.sql

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Note. This uses dbms_job, so job_queue_processes needs to be set greater than 0.

To see the job: selectjob

,what

fromdba_jobs

/

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To delete the job:exec dbms_job.remove();

Performance - AWR

Display a list of snapshots Produce a report To see the snapshot interval and retention period Change the snapshot interval Change the retention period Manually take a snapshot List all baselines Create a baseline Remove a baseline Enable/Disable automatic snapshots Time model queries Produce an Active Session History (ASH) reportDisplay a list of snapshots


selectsnap_id

,snap_level

,to_char(begin_interval_time, 'dd/mm/yy hh24:mi:ss') begin

fromdba_hist_snapshot

order by 1

/

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Produce a report

@?/rdbms/admin/awrrpt.sql

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To see the snapshot interval and retention period

col snap_interval format a30

col retention format a30

selectsnap_interval

,retention

fromdba_hist_wr_control

/

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Change the snapshot interval

Note. This example changes it to 30 minutesexec dbms_workload_repository.modify_snapshot_settings (interval => 30)

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Change the retention period

Note. This example changes it to two weeks (14 days)exec dbms_workload_repository.modify_snapshot_settings (retention => 14*24*60)

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Manually take a snapshot

exec dbms_workload_repository.create_snapshot

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List all baselines

set lines 100

col baseline_name format a40

selectbaseline_id

,baseline_name

,start_snap_id

,end_snap_id

fromdba_hist_baseline

order by 1

/

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Create a baseline

exec dbms_workload_repository.create_baseline (, ,'')

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Remove a baseline

exec dbms_workload_repository.drop_baseline('')

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Enable/Disable automatic snapshots

Note. This job is enabled by defaultexec dbms_scheduler.enable('GATHER_STATS_JOB')

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and to disable...exec dbms_scheduler.disable('GATHER_STATS_JOB')

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Time model queries

System time modelset lines 100 pages 999

selectstat_name

,value

fromv$sys_time_model

order by value desc

/

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Session time modelset lines 100 pages 999

selectstat_name

,value

fromv$sess_time_model

wheresid = '&sid'

order by value desc

/

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Produce an Active Session History (ASH) report

@?/rdbms/admin/ashrpt.sql

Backup - DataGuard

Startup commands To remove a delay from a standby Cancel managed recovery Register a missing log file If FAL doesn't work and it says the log is already registered Check which logs are missing Disable/Enable archive log destinations Turn on fal tracing on the primary db Stop the Data Guard broker Show the current instance role Logical standby apply stop/start See how up to date a physical standby is Display info about all log destinations Display log destinations options List any standby redo logsStartup commands

startup nomount

alter database mount standby database;

alter database recover managed standby database disconnect;

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To remove a delay from a standby

alter database recover managed standby database cancel;

alter database recover managed standby database nodelay disconnect;

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Cancel managed recovery

alter database recover managed standby database cancel;

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Register a missing log file

alter database register physical logfile '';

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If FAL doesn't work and it says the log is already registered

alter database register or replace physical logfile '';

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If that doesn't work, try this...shutdown immediate

startup nomount


alter database recover automatic standby database;

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wait for the recovery to finish - then cancelshutdown immediate

startup nomount


alter database recover managed standby database disconnect;

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Check which logs are missing

Run this on the standby... select local.thread#

, local.sequence# from

(select thread#

, sequence#

from v$archived_log

where dest_id=1) local

where local.sequence# not in

(select sequence#

from v$archived_log

where dest_id=2 and

thread# = local.thread#)

/

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Disable/Enable archive log destinations

alter system set log_archive_dest_state_2 = 'defer';

alter system set log_archive_dest_state_2 = 'enable';

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Turn on fal tracing on the primary db

alter system set LOG_ARCHIVE_TRACE = 128;

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Stop the Data Guard broker

alter system set dg_broker_start=false

/

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Show the current instance role

selectdatabase_role

fromv$database

/

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Logical standby apply stop/start

Stop...alter database stop logical standby apply;

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Start...alter database start logical standby apply;

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See how up to date a physical standby is

Run this on the primaryset numwidth 15

selectmax(sequence#) current_seq

fromv$log

/

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Then run this on the standbyset numwidth 15

selectmax(applied_seq#) last_seq

fromv$archive_dest_status

/

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Display info about all log destinations

To be run on the primaryset lines 100

set numwidth 15

column ID format 99

column "SRLs" format 99

column active format 99

col type format a4

selectds.dest_id id

,ad.status

,ds.database_mode db_mode

,ad.archiver type

,ds.recovery_mode

,ds.protection_mode

,ds.standby_logfile_count "SRLs"

,ds.standby_logfile_active active

,ds.archived_seq#

fromv$archive_dest_statusds

,v$archive_dest

ad

whereds.dest_id = ad.dest_id

andad.status != 'INACTIVE'

order by

ds.dest_id

/

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Display log destinations options

To be run on the primaryset numwidth 8 lines 100

column id format 99

selectdest_id id

,archiver

,transmit_mode

,affirm

,async_blocks async

,net_timeout net_time

,delay_mins delay

,reopen_secs reopen

,register,binding

fromv$archive_dest

order by

dest_id

/

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List any standby redo logs


col member format a70

selectst.group#

,st.sequence#

,ceil(st.bytes / 1048576) mb

,lf.member

fromv$standby_logst

,v$logfilelf

wherest.group# = lf.group#

/

Backup - Flashback

To put the session back in time Copy old data into a new table Export a database from a point in time Find the current SCN number Set the database recovery directory and size Set the flashback database retention target Turn on flashback database What is the earliest time the database can be flashed back to? Get a list of times and scn numbers Flash the database backTo put the session back in time

Note. undo_management must be autoNote. Take a look at undo_retention to get an idea of how far back you might be able to go.Note. This can't be run as sys - system works thoughexec dbms_flashback.enable_at_time(to_date('2006-AUG-24 12:00:00', 'YYYY-MON-DD HH24:MI:SS'));

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To disable flashback run...exec dbms_flashback.disable;

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Copy old data into a new table

First, create an empty copy of the source table...create table old_test_table

tablespace andy

as select *

from test_table

where rownum < 1

/

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Now, insert the old data into it...insert /*+ APPEND */ old_test_table

(select * from test_table as of timestamp

to_timestamp('24-AUG-06 12:00:00','DD-MON-YY HH24:MI:SS'))

/

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Export a database from a point in time

exp / file=full_scr9.dmp log=full_scr9.log flashback_time=TO_TIMESTAMP('10-09-2006 09:00:00', 'DD-MM-YYYY HH24:MI:SS')

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exp / parfile=full_scr9.par

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parfile...userid=system/******

file=full_scr9.dmp

log=full_scr9.log

flashback_time='2006-09-13 12:00:00'

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Find the current SCN number

select dbms_flashback.get_system_change_number from dual

/

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Set the database recovery directory and size

These settings are dynamicalter system set db_recovery_file_dest='' scope=both

/

alter system set db_recovery_file_dest_size= scope=both

/

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Set the flashback database retention target

alter system set db_flashback_retention_target= scope=both

/

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Turn on flashback database

shutdown immediate

startup mount

alter database flashback on;

alter database open;

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What is the earliest time the database can be flashed back to?

selectoldest_flashback_scn scn

,to_char(oldest_flashback_time, 'hh24:mi:ss dd/mm/yyyy') oldest_time

fromv$flashback_database_log

/

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Get a list of times and scn numbers

set pages 999

selectscn

,to_char(time_dp, 'hh24:mi:ss dd/mm/yyyy') time

fromsmon_scn_time

order by scn

/

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Flash the database back

shutdown immediate

startup mount exclusive

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flashback database to scn ;

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or...flashback database to timestamp to_timestamp('22/04/2007 19:30:00','dd/mm/yyyy hh24:mi:ss');

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alter database open resetlogs;

Manual upgrade from 9i to 10g Release 2

This procedure describes the steps necessary to manually upgrade a database from 9.2.x to 10.2.x. It assumes that you have already installed 10g onto the server. Of course, it is essential that you take a backup of your database before attempting any upgrade.

1. Compile any invalid objects@?/rdbms/admin/utlrp.sql

2. Create a sysaux tablespaceHaving a sysaux tablespace is a requirement in 10g. So, if you haven't already got one, create one now.

create tablespace sysaux

datafile '' size 512M

extent management local

segment space management auto

/

3. Run utlu102i.sqlThis utility script checks that the database is ready to be upgraded to 10g. It also identifies any actions that need to be taken. The script is located in the 10g oracle home, so you will need to specify the full path to it.

@/u01/app/oracle/product/10.2.0/db_1/rdbms/admin/utlu102i.sql

Review the output and make any necessary alterations. Make a note of how many invalid objects there are.

4. Shut the database down with either normal or immediateshutdown immediate

5. Copy the spfile (or pfile) and the password file from the existing home to the 10g one.cp ${ORACLE_HOME}/dbs/*${ORACLE_SID}* /dbs/

6. Edit oratabAlter /etc/oratab (or /var/opt/oracle/oratab) to point to the10g home. Once done, rerun oraenv to bring the alteration into effect.

7. Upgrade the database

sqlplus "/ as sysdba"

startup upgrade

This next bit is the upgrade itself. It takes roughly half an hour to complete. Spool the output to a file so that you can review it afterward.

@?/rdbms/admin/catupgrd.sql

8. Recompile any invalid objects@?/rdbms/admin/utlrp.sql

Compare the number of invalid objects with the number noted in step 3. It should hopefully be the same or less.

9. Then check the status of the upgrade@?/rdbms/admin/utlu102s.sql

10. Alter or remove initialisation parametersTemporarily creating a pfile is the easiest way.

create pfile from spfile;

shutdown immediate

vi ${ORACLE_HOME}/dbs/init${ORACLE_SID}.ora

Alter/remove parameters identified in step 9. Set compatible to 10.2.0.0.0

startup

create spfile from pfile;

shutdown immediate

startup

That's it!Capture all SQL run between two points in time

tnsManager - Distribute tnsnames the easy way and for free!

There are situations where it is useful to capture the SQL that a particular user is running in the database. Usually you would simply enable session tracing for that user, but there are two potential problems with that approach.

The first is that many web based applications maintain a pool of persistent database connections which are shared amongst multiple users. The second is that some applications connect, run some SQL and disconnect very quickly, making it tricky to enable session tracing at all (you could of course use a logon trigger to enable session tracing in this case).

A quick and dirty solution to the problem is to capture all SQL statements that are run between two points in time.

The following procedure will create two tables, each containing a snapshot of the database at a particular point. The tables will then be queried to produce a list of all SQL run during that period.

If possible, you should do this on a quiet development system - otherwise you risk getting way too much data back.

1. Take the first snapshotRun the following sql to create the first snapshot:

createtable sql_exec_before as

selectexecutions

, hash_value

fromv$sqlarea

/

2. Get the user to perform their task within the application 3. Take the second snapshot selectaft.hash_value

fromsql_exec_before bef

,sql_exec_after aft

whereaft.executions > bef.executions

andaft.hash_value = bef.hash_value (+)

/

4. Check the resultsNow that you have captured the SQL it is time to query the results.

This first query will list all query hashes that have been executed:

selectaft.hash_value


,sql_exec_after aft



/

This one will display the hash and the SQL itself:


break on hash_value

selecthash_value

,sql_text

from v$sqltext

wherehash_value in (

selectaft.hash_value


,sql_exec_after aft



)

order by

hash_value

,piece

/

5. Tidy upDon't forget to remove the snapshot tables once you've finished:

drop table sql_exec_before

/

drop table sql_exec_after

/

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important oracle query & script

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