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When you try to build an index (by using CREATE INDEX or ALTER INDEX) on a spatial data type of a large table, Microsoft SQL Server 2012 or SQL Server 2014 may perform poorly. You can find many spinlock contentions on SOS_CACHESTORE and SOS_SELIST_SIZED_SLOCK.

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Hotfix update package information A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

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More Information

Spinlocks protect the common language runtime (CLR) procedure cache entries. The query plan for a created or altered index usually involves an Apply operator or a Nested Loop operator. The outer side of the JOIN operation is returning rows from the spatial table and driving the spatial function. Every time that the function is invoked, a spinlock may be used. When the query runs with high degrees of parallelism, the spinlocks may become a bottleneck. The following diagram is an example of such a spatial plan.

Spatial plan


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


For more information about another performance issue when you build an index on a spatial data type of a large table in SQL Server 2012, click the following article number to view the article in the Microsoft Knowledge Base:

2887888 FIX: Slow performance in SQL Server when you build an index on a spatial data type of a large table in a SQL Server 2012 instance

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