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In OLTP systems, use a maximum MAXDOP setting of 8, including systems with access to more than 8 CPU cores. The effort to split and rejoin a query across more than 8 CPUs often outweighs the benefits of parallelism.

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In some cases, parallel queries in an OLTP environment are chosen by SQL Server to circumvent poor design and maintenance practices, most often as a result of missing indexes or out-of-date statistics. For example, SQL Server may decide to perform an index scan rather than a lookup, in which case it may parallelize the query. A high incidence of parallel queries is typically accompanied by a large number of CXPACKET waits. In chapter 17, we ll spend more time analyzing wait types, including CXPACKET. In typical OLTP environments, MAXDOP is often set to 1 to limit the CPU and memory impact from parallel queries. In such cases, the question needs to be asked as to why SQL Server is choosing parallel queries that is, are the indexes being designed and maintained appropriately We ll cover index design and maintenance in chapter 13. One of the downsides from setting MAXDOP to 1 is that certain operations, such as index rebuilds, benefit greatly from parallelism but are unable to do so with a MAXDOP 1 setting. In such cases, you can specify the MAXDOP setting at a statement level. For example, the CREATE INDEX command, an example of which is shown here, accepts a MAXDOP parameter:

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-- Use a MAXDOP hint to override the default server MAXDOP setting CREATE NONCLUSTERED INDEX [IX_Address_StateProvinceID] ON [Person].[Address] ([StateProvinceID] ASC) WITH (MAXDOP=0) GO

The several problems in this section show how to fmd the average value of several different functions and illustrate applications of the technique

In this example, we specify MAXDOP = 0 to override the instance default MAXDOP setting, and thereby permit the index creation to be parallelized if SQL Server decides that s the best approach.

Figure 7.6 The Advanced tab of the Server Properties window allows changes to Server configuration settings, such as Max Degree of Parallelism and Cost Threshold for Parallelism.

Like all configuration options, Max Degree of Parallelism can be set using sp_configure, or via the Advanced page of a server s properties window in SQL Server Management Studio, as shown in figure 7.6.

7-25

If MAXDOP is left at the default value, or set to a number higher than 1, the threshold at which SQL Server will consider a parallel plan can be set through the Cost Threshold for Parallelism option. This value, specified in seconds, represents the estimated time the query would take if executed serially on a single CPU. Queries estimated to take longer than this will be considered for parallelism. The default value for this setting is 5. In some cases, increasing this value is a better alternative to setting MAXDOP to 1 when dealing with a large number of (unwanted) parallel queries. With these CPU configuration options covered, let s turn our attention now to some other general server settings. Like most of the CPU settings, these settings are also best left at their default values.

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