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SQL Server has encountered occurrences of cachestore flush

 

 

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SQL Server has encountered occurrences of cachestore flush.


Applies to: SQL Server 2005 Standard Edition SP3.
 

Problem Description.
 

One of my customers asked me about the following messages he found on the SQL Server Error Log of a SQL Server instance:


52:40.1 spid225 SQL Server has encountered 2 occurrence(s) of cachestore flush for the 'Bound Trees' cachestore (part of plan cache) due to some database maintenance or reconfigure operations.

52:40.1 spid225 SQL Server has encountered 2 occurrence(s) of cachestore flush for the 'SQL Plans' cachestore (part of plan cache) due to some database maintenance or reconfigure operations.

52:39.8 spid225 SQL Server has encountered 2 occurrence(s) of cachestore flush for the 'Object Plans' cachestore (part of plan cache) due to some database maintenance or reconfigure operations.

 

Cause
 

After examining the SQL Server Error Log I found the entries were appearing after some restore operations. Entries like the following were found prior to the ones found by my customer.

The database 'XXXX' is marked RESTORING and is in a state that does not allow recovery to be run.

These messages are common on SQL Server 2005 SP2 up to SQL Server 2005 SP4. This does not happen on SQL Server 2008 and later.

The support article KB917828 have this issue documented, and enumerates other possible causes for those messages like these ones:
 

bulletDBCC CHECKDB was run.
bulletAUTO_CLOSE database option is set to on.
bulletA database snapshot for a source database is dropped.
bulletA database is dropped.
bulletAn ALTER DATABASE statement was run on the instance.
bulletA RECONFIGURE statement was run on the instance.



 

 

 

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