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How can you tell a query is a 'key lookup' by reading through the query_plan xml?

Posted By:      Posted Date: October 21, 2010    Points: 0   Category :Sql Server


I thought I was being real tricky with SQL 2005 - I create a temp table of all query plans from stored procedures

SELECT *,  CAST( qp.query_plan AS VARCHAR(MAX) ) AS PlanText
INTO #QueryPlans
FROM sys.dm_exec_cached_plans AS cp
CROSS APPLY sys.dm_exec_query_plan(plan_handle) AS qp
WHERE objtype = 'proc' AND qp.query_plan IS NOT NULL

then I can find all rid lookups via

SELECT QP.BucketID, Query_Plan, OBJECT_NAME( QP.ObjectID ) AS [Stored Procedure], PlanText, Size_In_Bytes, UseCounts
FROM #QueryPlans QP
WHERE dbo.GetSubStringCount( QP.PlanText, 'RID Lookup', ' ) > 0

(If you click on Query_Plan it will bring up the query plan in SQL - pretty good verification tool )

But I cannot find the sequence of text which denotes the query plan is displaying 'key lookup.'

Anyone have an idea?

The function GetSubstringCount and the associated Numbers table can be found here from Adam Machanic - http://sqlblog.com/blogs/adam_machanic/archive/2006/07/12/counting-occurrences-of-a-substring-within-a-string.aspx




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