You may experience a decrease in query performance after you perform certain database maintenance operations or regular transaction operations in SQL Server 2005 ( http://support.microsoft.com/kb/917828 ) 2006-10-15 06:03:29.330 spid59 SQL Server has encountered 4 occurrence(s) of cachestore flush for the 'Object Plans' cachestore (part of plan cache) due to some database maintenance or reconfig..