Querying Information from the Plan Cache, Simplified
One of the great things about the Dynamic Management Objects (DMOs) that expose the information in plan cache is that, by their very nature, they can be queried. The plans exposed are in XML format, so you can run XQuery against them to pull out interesting information. For example, what if you wanted to see all the plans in cache that had a Timeout as the reason for early termination from the optimizer? It’d be great way to see which of your plans were less than reliable. You could so like this: WITH XMLNAMESPACES(DEFAULT N'http://schemas.microsoft.com/sqlserver/2004/07/showplan'), QueryPlans AS ( SELECT RelOp.pln.value(N'@StatementOptmEarlyAbortReason', N'varchar(50)') AS TerminationReason, RelOp.pln.value(N'@StatementOptmLevel', N'varchar(50)') AS OptimizationLevel, --dest.text, SUBSTRING(dest.text, (deqs.statement_start_offset / 2) + 1, (deqs.statement_end_offset - deqs.statement_start_offset) / 2 + 1) AS StatementText, deqp.query_plan, deqp.dbid, deqs.execution_count, deqs.total_elapsed_time, deqs.total_logical_reads, deqs.total_logical_writes FROM…