it390 business database administration

© 2006 ITT Educational Services Inc. Course Name: IT390 Business Database Administration Unit 10 Slide 1

IT390 Business Database Administration

Unit 10: Troubleshooting SQL Server 2000


Objectives

• Troubleshoot basic Microsoft SQL Database Server problems.

• Apply SQL Server troubleshooting to resolve network problems.

• Explain the commands to check network connections.


• Monitoring is the process by which you can check if your database server is properly working.

• The performance of a database deteriorates if maintenance tasks are not frequently performed on the database.

• SQL Server provides you with various tools to monitor your database server to achieve optimal performance.

Monitoring the Database Server


• Differentiate between Response Time and Throughput Time.

Can you… ?


List the factors that affect the performance of an SQL database server.

Can you… ?

Much more painfulthan proper maintenance!


Monitoring Performance Factors

A network administrator should check theusage of the following server resources:

Central processing unit (CPU)

Memory

Storage capacity

Network usage (A topic which has a larger scope!)


SQL Server Monitoring Tools

• SQL Server 2000 provides the following tools to monitor the factors that can hamper the performance of SQL Server 2000: T-SQL commands

SQL Server 2000 Error Log

Current Activity Window

SQL Profiler


• Which SQL commands can you use to obtain information on CPU usage?

Class Activity

YIKES!!


Solution

You can use the following SELECT syntax to get the SQL server processes and their corresponding threads: SELECT spid, lastwaittype, dbid, uid, cpu, physical_io, memusage, status, loginname, program_namefrom master..sysprocessesORDER BY cpu descGO


• A database server might face various problems, such as network congestion, memory allocations, and permission problems on various database objects.

• SQL Server provides various debugging tools for diagnosing and rectifying errors, such as DBCC commands and Enterprise Manager.

Troubleshooting SQL Server 2000


• Performance tuning involves measures to enhance database performance. You can enhance performance of a database by taking small measures, which do not require much effort on your part except that you need to perform them at the right time. Some of these measures are:

• Indexing• Creating large tables• Defining optimized data retrieval queries • In addition, you can use the Performance Monitor

and Query Analyzer tools to monitor the performance of a database.

HOW?

Performance Tuning: Techniques and Tools


You are the DBA at PQR Inc. You are frequently receiving errors in SQL Server 2000. How can you view the root cause of these errors?

Class Activity


Viewing SQL Server Error Log

• You can view SQL Server Error Log using Enterprise Manager.


• What is the significance of the Current Log File?

Class Activity


The Current Error Log is the most recent error log located under Program Files\Microsoft SQL Server\Mssql\Log.

Answer


Viewing an Error Log Message You can view an error message by double-clicking any item in

the SQL Server Error Log file.


Troubleshooting / Tools for Database Configurations

• SQL Server provides database settings that can be used to troubleshoot some common problems, such as multiple users accessing the database at a critical time.

• You can use Enterprise Manager to change database settings under ‘Properties’ / Options tab.

• You can also use the sp_dboption system stored procedure to change database settings.

• Alternatively, you can use DBCC commands to change database settings.


Class Activity• What are the following DBCC commands used for?

DBCC CHECKCATALOG

DBCC CHECKTABLE

DBCC CHECKDB


Solution

• What are the following DBCC commands used for? DBCC CHECKCATALOG


Solution (cont.)

• What are the following DBCC commands used for? DBCC CHECKTABLE


Solution (cont.)

• What are the following DBCC commands used for? DBCC CHECKDB


Class Activity

John is a DBA at XYZ Inc. The database server at XYZ is facing network problems. What can be the causes of this problem?


Monitoring the Network

• A database server can also face problems due to network errors thus causing congestion. There can be several kinds of these network errors, such as: Bandwidth crunch (exhaustion)

Subnet masking

Congestion

Orphaned sessions


Orphaned Session

• Stays open on the server-side even after the client has disconnected.

• Occurs when the client cannot free the network connection(s) that it is holding even when the session is terminated.

• Takes up an SQL Server network connection, and prevents other clients from connecting to the Server.


Class Activity

What are the 2 primary commands to check for database network connectivity over named pipes?


Activity Answer

• Use the net view command: net view \\servername


Activity Answer

• Use the net use command: net use [device_name | *] [\\

computer_name\share_name[\volume]] [password | *]] [/user:[domain_name\]user_name] [[/delete] | [/persistent:{yes | no}]]


• Performance tuning involves measures to enhance the performance of a database. •There are tools that can monitor the performance of a database. Some of these tools are:

Performance Monitor Query Analyzer

Summary


• A Database Administrator should be able to use basic SQL Server Tools and Troubleshooting such as logs and the DBCC command.

• A Database Administrator should use the commands to check Network conductivity.

Summary


Did you understand the key points from the Lesson?

Do you have any questions?

Summary

it390 business database administration

Documents

performance of sql server

sql server troubleshooting

database performance

sql server processes

sql server error log

tsql commandssql server

database settings

following server resources