compile time analysis by sqlskills

Author: Alexander Shelemin

longest_compile_time.txt

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+--queries with biggest compile time
+
+SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
+WITH XMLNAMESPACES 
+(DEFAULT 'http://schemas.microsoft.com/sqlserver/2004/07/showplan')
+SELECT TOP 10
+CompileTime_ms,
+CompileCPU_ms,
+CompileMemory_KB,
+qs.execution_count,
+qs.total_elapsed_time/1000 AS duration_ms,
+qs.total_worker_time/1000 as cputime_ms,
+(qs.total_elapsed_time/qs.execution_count)/1000 AS avg_duration_ms,
+(qs.total_worker_time/qs.execution_count)/1000 AS avg_cputime_ms,
+qs.max_elapsed_time/1000 AS max_duration_ms,
+qs.max_worker_time/1000 AS max_cputime_ms,
+SUBSTRING(st.text, (qs.statement_start_offset / 2) + 1,
+(CASE qs.statement_end_offset
+WHEN -1 THEN DATALENGTH(st.text)
+ELSE qs.statement_end_offset
+END - qs.statement_start_offset) / 2 + 1) AS StmtText,
+query_hash,
+query_plan_hash
+FROM
+(
+SELECT 
+c.value('xs:hexBinary(substring((@QueryHash)[1],3))', 'varbinary(max)') AS QueryHash,
+c.value('xs:hexBinary(substring((@QueryPlanHash)[1],3))', 'varbinary(max)') AS QueryPlanHash,
+c.value('(QueryPlan/@CompileTime)[1]', 'int') AS CompileTime_ms,
+c.value('(QueryPlan/@CompileCPU)[1]', 'int') AS CompileCPU_ms,
+c.value('(QueryPlan/@CompileMemory)[1]', 'int') AS CompileMemory_KB,
+qp.query_plan
+FROM sys.dm_exec_cached_plans AS cp
+CROSS APPLY sys.dm_exec_query_plan(cp.plan_handle) AS qp
+CROSS APPLY qp.query_plan.nodes('ShowPlanXML/BatchSequence/Batch/Statements/StmtSimple') AS n(c)
+) AS tab
+JOIN sys.dm_exec_query_stats AS qs
+ON tab.QueryHash = qs.query_hash
+CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st
+ ORDER BY CompileTime_ms DESC
+--order by execution_count desc
+OPTION(RECOMPILE, MAXDOP 1);