ExtendEvent-判断DB是否有在使用

Posted 2020-11-23 JinweiChang

判断一个DB是否在被使用，需要观察一段时间，创建一个扩展事件会话，收集该DB是否有执行SQL即可。

 

 

创建会话

CREATE EVENT SESSION [DB_Usage] ON SERVER 
ADD EVENT sqlserver.sql_statement_completed(SET collect_statement=(1)
    ACTION(sqlserver.client_app_name,sqlserver.client_hostname,
    sqlserver.database_name,sqlserver.nt_username,sqlserver.sql_text,sqlserver.username)
    WHERE ([sqlserver].[equal_i_sql_unicode_string]([sqlserver].[database_name],N‘SDS_NONEDI_20190627‘) 
    OR [sqlserver].[equal_i_sql_unicode_string]([sqlserver].[database_name],N‘Web‘) 
    AND [sqlserver].[nt_user]<>N‘AAjinwei‘))
ADD TARGET package0.event_file(SET filename=N‘D:XEventDB_Usage.xel‘)
WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,
MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,
TRACK_CAUSALITY=OFF,STARTUP_STATE=ON)
GO

 

解析数据

    select 
    SWITCHOFFSET(n.value(‘@timestamp‘,‘Datetime‘),‘+08:00‘) as EventTime,
    n.value(‘(data[@name="duration"]/value)[1]‘, ‘int‘) as duration,
    n.value(‘(data[@name="statement"]/value)[1]‘, ‘nvarchar(max)‘) as statement,
    n.value(‘(action[@name="database_name"]/value)[1]‘, ‘nvarchar(128)‘) as database_name,
    n.value(‘(action[@name="client_app_name"]/value)[1]‘, ‘nvarchar(128)‘) as client_app_name,
    n.value(‘(action[@name="username"]/value)[1]‘, ‘nvarchar(128)‘) as username,
    n.value(‘(action[@name="nt_username"]/value)[1]‘, ‘nvarchar(128)‘) as nt_username,

    n.value(‘(action[@name="client_hostname"]/value)[1]‘, ‘nvarchar(128)‘) as client_hostname
from (select cast(event_data as XML) as event_data
from sys.fn_xe_file_target_read_file(‘D:XEventDB_Usage_0*.xel‘, null, null, null)) ed
cross apply ed.event_data.nodes(‘event‘) as q(n)