Активни сесии и състояние на SQL Server

Здравей,

Най-често задачата на DBA е да наблюдава базата данни и коя сесия е активна и коя неактивна или коя е блокирана.

Можете да използвате whoIsActive и следния скрипт за наблюдение на състоянието на всички сесии.

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED

SELECT 
SPID = er.session_id 
,BlkBy = er.blocking_session_id 
,ElapsedMS = er.total_elapsed_time 
,CPU = er.cpu_time 
,IOReads = er.logical_reads + er.reads 
,IOWrites = er.writes 
,Executions = ec.execution_count 
,CommandType = er.command 
,ObjectName = OBJECT_SCHEMA_NAME(qt.objectid,dbid) + '.' + OBJECT_NAME(qt.objectid, qt.dbid) 
,SQLStatement = 
SUBSTRING 
( 
qt.text, 
er.statement_start_offset/2, 
(CASE WHEN er.statement_end_offset = -1 
THEN LEN(CONVERT(nvarchar(MAX), qt.text)) * 2 
ELSE er.statement_end_offset 
END - er.statement_start_offset)/2 
) 
,Status = ses.status 
,[Login] = ses.login_name 
,Host = ses.host_name 
,DBName = DB_Name(er.database_id) 
,LastWaitType = er.last_wait_type 
,StartTime = er.start_time 
,Protocol = con.net_transport 
,transaction_isolation = 
CASE ses.transaction_isolation_level 
WHEN 0 THEN 'Unspecified' 
WHEN 1 THEN 'Read Uncommitted' 
WHEN 2 THEN 'Read Committed' 
WHEN 3 THEN 'Repeatable' 
WHEN 4 THEN 'Serializable' 
WHEN 5 THEN 'Snapshot' 
END 
,ConnectionWrites = con.num_writes 
,ConnectionReads = con.num_reads 
,ClientAddress = con.client_net_address 
,Authentication = con.auth_scheme 
FROM sys.dm_exec_requests er 
LEFT JOIN sys.dm_exec_sessions ses ON ses.session_id = er.session_id 
LEFT JOIN sys.dm_exec_connections con ON con.session_id = ses.session_id 
CROSS APPLY sys.dm_exec_sql_text(er.sql_handle) as qt 
OUTER APPLY 
( 
SELECT execution_count = MAX(cp.usecounts) 
FROM sys.dm_exec_cached_plans cp 
WHERE cp.plan_handle = er.plan_handle 
) ec 
ORDER BY 
er.blocking_session_id DESC, 
er.logical_reads + er.reads DESC, 
er.session_id;