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Gail is a database consultant from Johannesburg, South Africa, specializing in performance tuning and database optimization. Before moving to consulting, she worked at a large South African investment bank and was responsible for the performance of the major systems there. She was awarded MVP for SQL Server in July 2008 and spoke at both TechEd South Africa and the PASS Community Summit in Seattle in the same year. She s a frequent poster on the SQLServerCentral forums and has written a number of articles for the same site.
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43 How to optimize tempdb performance
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Although most DBAs know about the tempdb database, many seem to think of it as a black box that takes care of itself with no involvement required from the DBA. Although this may be true on smaller, less active SQL Server instances, tempdb can significantly affect SQL Server s performance. DBAs can act to ensure that tempdb performance is optimized and to optimize the overall performance of SQL Server.
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The tempdb database is one of SQL Server s included system databases and is used as a shared temporary workspace for many different kinds of activities, such as the following: Storing user objects, such as temporary local and global tables and indexes, temporary stored procedures, table variables, and the cursor. Storing temporary work tables used for hash joins, aggregations, cursors, and spool operations, and temporarily storing large objects; storing intermediate sort results from many different internal operations, such as creating or rebuilding indexes, in addition to some GROUP BY, ORDER BY, and UNION queries. Storing objects used when using AFTER triggers and INSTEAD OF triggers. Storing large XML objects. Storing the SQL Server version store (SQL Server 2005/2008), which includes the common version store and the online-index-build version store (Enterprise Edition). Storing intermediate results and sorting activity used during DBCC CHECKDB operations. Storing temporary objects for Service Broker.
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If your SQL Server instance is not busy, and it doesn t employ many of the activities described previously, then tempdb performance may not be a problem for you. On the other hand, if any of your SQL Server instances are busy, and are heavily involved in many, if not most, of the previously described activities, then you may find that tempdb can become a significant bottleneck for your entire SQL Server instance.
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Unlike other SQL Server databases, the tempdb database is dropped and re-created every time the SQL Server service is stopped and restarted. Here s what happens. When the SQL Server service is started, by default, SQL Server makes a copy of the model database to create a new 8 MB tempdb database, inheriting customizations made to the model database. In addition, a transaction log file of 1 MB is created. For both the MDF and the LDF files, autogrowth is set to grow by 10 percent with unrestricted growth. Each SQL Server instance may have only one tempdb database. In addition, tempdb exhibits many behaviors that don t occur with other SQL Server databases. For example, tempdb is configured to run using the simple recovery model, and this setting cannot be changed. In addition, many database options, such as Online, Read Write, Auto Close, Auto Shrink, and others are preset and cannot be modified. The tempdb database has many other restrictions including the following: it can t be dropped; it can t be captured in a database snapshot; it can t participate in mirroring; and it can t allow DBCC CHECKDB to be run on it. And as you would expect, neither the tempdb database nor its transaction log file can be backed up. This makes sense, as tempdb is designed for temporary objects only, and is re-created each time SQL Server restarts. After tempdb has been created, DBAs can create objects in it just as in other databases. As user-created or internal objects are added to tempdb, it will automatically grow as necessary to whatever size is required to hold the objects. On servers with heavy tempdb activity, tempdb can grow considerably. As activity transpires in tempdb, transaction logging occurs, but somewhat differently than with other SQL Server databases. Operations performed within tempdb are minimally logged, which means that only enough information is logged so that temporary objects can be rolled back, if necessary. Minimal logging helps to reduce the overhead put on the SQL Server instance. Because the database is set to the simple recovery mode, the transaction log is truncated constantly.
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