SQL SERVER查询效率最差的SQL语句
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTEDSELECT TOP 20
CAST(qs.total_elapsed_time / 1000000.0 AS DECIMAL(28, 2))
AS ,
qs.execution_count,
SUBSTRING (qt.text, (qs.statement_start_offset/2) + 1,
((CASE WHEN qs.statement_end_offset = -1
THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2
ELSE
qs.statement_end_offset
END-
qs.statement_start_offset)/2) + 1) AS
, qt.text AS
, DB_NAME(qt.dbid) AS
, qp.query_plan
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) qt
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
ORDER BY total_elapsed_time DESC
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