PRACTICE in VB.NET

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PRACTICE
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Viewing and Recycling the SQL Error Log
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The SQL Server error log contains user-defined events and certain system events. You can use this error log to troubleshoot problems related to SQL Server. A new log starts whenever you start an instance of SQL Server. However, you can start a new log without stopping and restarting SQL Server by using the Transact-SQL sp_cycle_errorlog stored procedure. In this practice session, you inspect the current log and then start a new one.
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Practice 1: Viewing the SQL Server Error Log
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In this practice, you view the SQL Server error log and filter for SPID57. 1. Log in to your domain at your member server by using either your domain administrator account or an account that has been added to the sysadmin server role. If you are using virtual machine software, log in to your domain and connect to your member server.
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Performance Monitoring
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2. From Programs, Microsoft SQL Server 2005, click SQL Server Management Studio. Connect to the database engine on your member server, specifying Windows Authentication. Connect using TCP/IP, and specify the AdventureWorks database. 3. In Object Explorer, expand your member server, expand Management, and then expand SQL Server Logs as shown in Figure 5-8. Note that on your screen the server name is GLASGOW rather than OFFICE.
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Figure 5-8
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Accessing the SQL Server logs.
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4. Right-click the current log and choose View SQL Server Log. The log appears, as shown in Figure 5-9.
Figure 5-9
The current SQL Server log.
Lesson 2: Choosing the Appropriate Information to Monitor
5. Click Filter on the toolbar. In the Filter Settings dialog box, specify the Source as spid57 and select the Apply Filter check box, as shown in Figure 5-10.
Figure 5-10 Specifying a filter.
6. Click OK. The filter is applied as shown in Figure 5-11. You should see any SPID57 events that are in the log. If no SPID57 events have been captured, the filtered log shows no events.
Figure 5-11 A filtered log.
5
Performance Monitoring
Practice 2: Recycling the SQL Server Log
In this practice, you start a new SQL Server log by using the sp_cycle_errorlog stored procedure. 1. Log in to your domain at your member server by using either your domain administrator account or an account that has been added to the sysadmin server role. If you are using virtual machine software, log in to your domain and connect to your member server. 2. From Programs, Microsoft SQL Server 2005, click SQL Server Management Studio. Connect to the database engine on your member server, specifying Windows Authentication. Connect using TCP/IP, and specify the AdventureWorks database. 3. Click New Query. In Query Editor, type sp_cycle_errorlog as shown in Figure 5-12.
Figure 5-12 Specifying the stored procedure.
4. Click Execute (or press F5). 5. View the current SQL Server log by using the procedure specified in Practice 1. The reinitialized SQL Server log is shown in Figure 5-13.
Lesson 2: Choosing the Appropriate Information to Monitor
Figure 5-13 The reinitialized SQL Server log.
Lesson Summary
The sys.dm_exec_query_stats server-scoped DMV returns aggregate performance statistics for cached query plans. You can view the SQL Server error log to ensure that processes have completed successfully (for example, backup and restore operations, batch commands, and scripts). The sp_cycle_errorlog system stored procedure can be used to cycle the error log files without having to restart the instance of SQL Server. The sys.dm_os_wait_stats DMV returns information about waits encountered by threads that are in execution. The SQLServer:Wait Statistics performance object contains performance counters that report information about wait status. A SQL trace contains event categories and describes an event class within a category by using data columns. SQL traces can be generated by using system stored procedures, but typically SQL Server Profiler is used for this purpose. Service Broker can be used to implement notifications that inform you when services have started.
5
Performance Monitoring
When you start an instance of the SQL Server database engine, you are starting the SQL Server service. After you start the SQL Server service, users can establish new connections to the server. The SQL Server Agent service runs jobs, monitors SQL Server, processes alerts, and allows you to automate administrative tasks. The service must be running before local or multi-server administrative jobs can run automatically. Failover clustering in SQL Server 2005 is implemented by the MSCS service. You can configure a SQL Server instance on one node of a failover cluster to fail over to any other node in the cluster during a hardware failure, operating system failure, or planned upgrade.
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