Download Troubleshooting SQL Server 2000

IT390 Business Database Administration
Unit 10: Troubleshooting SQL Server 2000
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 1
Objectives
• Troubleshoot basic Microsoft SQL
Database Server problems.
• Apply SQL Server troubleshooting to
resolve network problems.
• Explain the commands to check network
connections.
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 2
Monitoring the Database Server
•
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.
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 3
Can you… ?
• Differentiate between Response
Time and Throughput Time.
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 4
Can you… ?
List the factors that affect the performance of an
SQL database server.
Much more painful
than proper
maintenance!
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 5
Monitoring Performance Factors

A network administrator should check the
usage of the following server resources:
 Central
processing unit (CPU)
 Memory
 Storage
capacity
 Network
usage (A topic which has a larger scope!)
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 6
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
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 7
Class Activity
• Which SQL commands can you use to
obtain information on CPU usage?
YIKES!!
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 8
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_name
from master..sysprocesses
ORDER BY cpu desc
GO
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 9
Troubleshooting SQL Server 2000
• 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.
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 10
Performance Tuning: Techniques and Tools
•
•
•
•
•
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?
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 11
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 12
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 13
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 14
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 15
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 16
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 17
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 18
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 19
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 20
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 21
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 22
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 23
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 24
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 25
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 26
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 27
Class Activity
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?
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 28
Viewing SQL Server Error Log
•
You can view SQL Server Error Log using Enterprise Manager.
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 29
Class Activity
•
What is the significance of the Current Log File?
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 30
Answer
The Current Error Log is the most recent error log located
under Program Files\Microsoft SQL Server\Mssql\Log.
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 31
Viewing an Error Log Message
You can view an error message by double-clicking any item in
the SQL Server Error Log file.
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 32
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.
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 33
Class Activity
•
What are the following DBCC commands used for?

DBCC CHECKCATALOG

DBCC CHECKTABLE

DBCC CHECKDB
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 34
Solution
•
What are the following DBCC commands used for?

DBCC CHECKCATALOG
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 35
Solution (cont.)
•
What are the following DBCC commands used for?

DBCC CHECKTABLE
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 36
Solution (cont.)
•
What are the following DBCC commands used for?

DBCC CHECKDB
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 37
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?
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 38
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
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 39
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.
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 40
Class Activity
What are the 2 primary commands
to check for database network
connectivity over named pipes?
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 41
Activity Answer
•
Use the net view command:

net view \\servername
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 42
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}]]
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 43
Summary
• 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
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 44
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.
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 45
Summary
Did
you understand the key
points from the Lesson?
Do
you have any questions?
© 2006 ITT Educational Services Inc.
Course Name: IT390 Business Database
Administration Unit 10 Slide 46