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It s often necessary to view overall system performance in relation to server resources. Windows NT Performance Monitor is the best tool for viewing and recording all of this information in a single place. When SQL Server 7 is installed, several performance counters are added to the list of items available through Performance Monitor. One of the main challenges with using Performance Monitor is deciding what to monitor. To make this easier, Microsoft has included some preset counters that will be of interest to SQL Server DBAs. To access these counters, click the Performance Monitor icon in the SQL Server 7 program group. From there, you ll see the basic SQL Server performance statistics and will be able to add other information as necessary (see Figure 4-15). For example, if you re also running
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Figure 4-15.
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Internet Information Server (IIS) on the same machine, you might want to compare the number of web users to the number of database users currently on the system.
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The two most important resources in dealing with overall server performance are the CPU speed and memory. SQL Server is installed with default memory and CPU usage options that are appropriate for working in most environments. If you need to make changes, however, you have options. To set SQL Server memory settings, do the following: 1. In Enterprise Manager, right-click the name of the server you want to modify and select Properties.
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The default option to dynamically configure memory usage will be appropriate for most situations. If you have a large amount of RAM on the system, you might want to increase the minimum memory size. Alternatively, if your server will be running many other important applications, you might want to lower the maximum setting. If you have an accurate idea of how much memory SQL Server will typically use, you can put the value at a fixed setting. This precaution will minimize the performance overhead caused by excessive paging of information to and from the hard disk. 3. You can check the Reserve Physical Memory for SQL Server option if you want Windows NT to set aside physical RAM for the service. This prevents the
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2. In the Memory tab, you can modify the amount of memory the SQL Server will use:
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operating system from swapping this information to disk and can increase performance. The Maximum Query Memory option specifies the limit of RAM that can be allocated to any single user transaction. 4. In the Processor tab, you can specify which CPU(s) in a multiprocessor system can be used by SQL Server. This is often useful if you want to dedicate one or more CPUs to operating system functions and other applications. The Maximum Worker Threads setting specifies how many operations SQL Server can perform simultaneously. A higher number allows more users and processes to occur, but performance might decrease as SQL Server switches between threads. If the value is exceeded, users will receive an error message when trying to execute a command. 5. The Boost SQL Server Priority setting should be used if the primary function of your machine is to act as a SQL Server. This will give the SQL Server service more CPU time when multiple tasks are competing for resources. 6. Finally, in the Parallelism section, you can specify whether you want SQL Server to distribute query processing between multiple processors. Multiprocessing generally incurs overhead, and the default setting for the minimum query plan threshold will determine whether it is efficient to use multiple CPUs for this task. Costs are based on the time required to process a transaction. Legal values are between 0 and 32,767. 7. To accept all changes, click OK. Dynamic memory changes will take place immediately, but others might require a restart of the SQL Server. Now that we ve looked at two relatively easy ways to monitor and optimize overall server performance, let s move down a level and look at database settings.
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