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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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.
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