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利用扩展事件(Xevents)捕捉高消耗查询
生产环境中有时需要使用者抓取一些特定的语句分析,如超超长查询,或高IO查询等.一般来说大家对跟踪比较熟悉,主要因为其有完善的UI支持.由于扩展事件在sql2012才提供UI支持,所以虽然在08时就已经存在的更轻量级的扩展事件没有被广泛使用.这里和大家分享一个扩展事件脚本,用来捕捉高消耗的查询语句.
注意:使用完毕后应停止扩展事件捕捉.
应根据自身实际需求设置过滤条件,如CPU,duration,Reads等
在sql2012中会提供更为丰富的内容(如query_hash等)
code 1 将扩展事件追踪保存到本地文件中
CREATE EVENT SESSION L_QUERIES ON SERVER ADD EVENT sqlserver.sql_statement_completed( ACTION(sqlserver.username,sqlserver.client_hostname,sqlserver.database_id,sqlserver.session_id,sqlserver.sql_text,sqlserver.plan_handle) WHERE (cpu>1000 AND duration>=5000000 and Reads>=10000 and sqlserver.database_id=17)) ADD TARGET package0.asynchronous_file_target (SET FILENAME = N‘D:\L_QUERIES.xel‘, METADATAFILE = N‘D:\L_QUERIES.xem‘)WITH (max_dispatch_latency = 1 seconds);--cpu 1s--duration 5s--reads io 10000--database_id 17 if you do not need it ,cut outGOALTER EVENT SESSION L_QUERIES ON SERVER STATE = START;------start the eventGO SELECT data.value ( ‘(/event[@name=‘‘sql_statement_completed‘‘]/@timestamp)[1]‘, ‘DATETIME‘) AS [Time], data.value ( ‘(/event/data[@name=‘‘cpu‘‘]/value)[1]‘, ‘INT‘) AS [CPU (ms)], data.value ( ‘(/event/data[@name=‘‘reads‘‘]/value)[1]‘, ‘BIGINT‘) AS [Reads], data.value ( ‘(/event/action[@name=‘‘session_id‘‘]/value)[1]‘, ‘smallint‘) AS [session_id], data.value ( ‘(/event/action[@name=‘‘database_id‘‘]/value)[1]‘, ‘smallint‘) AS [database_id], CONVERT (FLOAT, data.value (‘(/event/data[@name=‘‘duration‘‘]/value)[1]‘, ‘BIGINT‘)) / 1000000 AS [Duration (s)], data.value ( ‘(/event/action[@name=‘‘username‘‘]/value)[1]‘, ‘VARCHAR(100)‘) AS [username], data.value ( ‘(/event/action[@name=‘‘client_hostname‘‘]/value)[1]‘, ‘VARCHAR(100)‘) AS [client_hostname], data.value ( ‘(/event/action[@name=‘‘sql_text‘‘]/value)[1]‘, ‘VARCHAR(MAX)‘) AS [SQL Statement], SUBSTRING (data.value (‘(/event/action[@name=‘‘plan_handle‘‘]/value)[1]‘, ‘VARCHAR(100)‘), 15, 50) AS [Plan Handle]FROM (SELECT CONVERT (XML, event_data) AS data FROM sys.fn_xe_file_target_read_file (‘D:\L_QUERIES*.xel‘, ‘D:\L_QUERIES*.xem‘, null, null)) entriesORDER BY [Time] DESC;----------query the event info what you need--ALTER EVENT SESSION L_QUERIES ON SERVER STATE = STOP;---stop the event--DROP EVENT SESSION L_QUERIES ON SERVER;------------drop the event
code2 将扩展事件保存到ring buffer中
CREATE EVENT SESSION L_QUERIES ON SERVER ADD EVENT sqlserver.sql_statement_completed( ACTION(sqlserver.username,sqlserver.client_hostname,sqlserver.database_id,sqlserver.session_id,sqlserver.sql_text,sqlserver.plan_handle) WHERE (cpu>1000 AND duration>=5000000 and Reads>=10000 and sqlserver.database_id=17)) ADD TARGET package0.ring_buffer (SET max_memory = 4000) -----not the default 4096kb WITH (max_dispatch_latency = 1 seconds) --cpu 1s--duration 5s--reads io 10000--database_id 17 if you do not need it ,cut outGOALTER EVENT SESSION L_QUERIES ON SERVER STATE = START;------start the eventGO DECLARE @target_data XMLSELECT @target_data=CAST(target_data AS XML)FROM sys.dm_xe_sessions AS s JOIN sys.dm_xe_session_targets AS t ON t.event_session_address = s.addressWHERE s.name = ‘L_QUERIES‘ AND t.target_name = ‘ring_buffer‘ SELECT t.value(‘(@timestamp)[1]‘, ‘datetime2‘) AS [time], t.value (‘(data[@name=‘‘cpu‘‘]/value)[1]‘, ‘INT‘) AS [CPU (ms)], t.value (‘(data[@name=‘‘reads‘‘]/value)[1]‘, ‘BIGINT‘) AS [Reads], t.value (‘(action[@name=‘‘session_id‘‘]/value)[1]‘, ‘smallint‘) AS [session_id], t.value (‘(action[@name=‘‘database_id‘‘]/value)[1]‘, ‘smallint‘) AS [database_id], CONVERT (FLOAT, t.value (‘(data[@name=‘‘duration‘‘]/value)[1]‘, ‘BIGINT‘)) / 1000000 AS [Duration (s)], t.value (‘(action[@name=‘‘username‘‘]/value)[1]‘, ‘VARCHAR(100)‘) AS [username], t.value (‘(action[@name=‘‘client_hostname‘‘]/value)[1]‘, ‘VARCHAR(100)‘) AS [client_hostname], t.value (‘(action[@name=‘‘sql_text‘‘]/value)[1]‘, ‘VARCHAR(MAX)‘) AS [SQL Statement], SUBSTRING (t.value (‘(action[@name=‘‘plan_handle‘‘]/value)[1]‘, ‘VARCHAR(100)‘), 15, 50) AS [Plan Handle] FROM @target_data.nodes(‘RingBufferTarget/event‘) AS q(t)ORDER BY [Time] DESC;----------query the event info what you need--ALTER EVENT SESSION L_QUERIES ON SERVER STATE = STOP;---stop the event--DROP EVENT SESSION L_QUERIES ON SERVER-----------drop the event
利用扩展事件(Xevents)捕捉高消耗查询
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