Sessions actives et état de SQL Server

Bonjour,

La tâche la plus fréquente du DBA est de surveiller la base de données et quelle session est active et laquelle est inactive ou laquelle est bloquée.

Vous pouvez utiliser whoIsActive et le script suivant pour surveiller l'état de toutes les sessions.

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;