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See the sample index rebuild script below using the MAXDOP query hint.The MAXDOP query hint ignores the instance-wide maximum degree of parallelism set by SQL Server and uses the explicit value in the T-SQL code. Person REBUILD OPTION (MAXDOP 1)GOALTER INDEX ALL ON Person.The image shown in Figure 1, indicates the run_value is set to "1," which allows SQL Server one processor to be utilized per query/statement.

This may require configuring "maximum degree of parallelism" (MAXDOP) to a value different than the default.

In some circumstances the MAXDOP value can be less than 8, even though modern servers may have more than 8 processors.

The first part of this tip focuses on SQL Server Enterprise Edition to reduce the duration for index maintenance for off-line rebuilds.

The second part of this tip is intended to reduce the duration for update statistics as it pertains to both SQL Server Standard and Enterprise Edition.

Be sure to properly plan the maintenance and associated MAXDOP settings if the server is not a dedicated SQL Server instance, but contains multiple SQL Server instances or a multi-purpose server with other applications.

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