J'ai créé une session d'événements étendus dans SQL Server 2008 R2. La session s'exécute et collecte les événements lorsqu'ils se produisent, exactement comme vous vous y attendez.
Si je déchiquette le xml alors qu'il y a relativement peu d'événements, les performances sont acceptables. Quand j'ai des milliers d'événements, il faut pour toujours déchiqueter le xml.
Je sais que je fais quelque chose de mal, je n'ai tout simplement pas assez de connaissances sur les composants internes du moteur XML pour comprendre quoi.
Voici la définition de ma session Extended Events:
IF EXISTS
(
SELECT 1
FROM sys.server_event_sessions dxs
WHERE dxs.name = 'queries'
)
BEGIN
IF EXISTS (
SELECT 1
FROM sys.dm_xe_sessions dxs
WHERE dxs.name = 'queries'
)
BEGIN
ALTER EVENT SESSION queries ON SERVER STATE = STOP;
END
DROP EVENT SESSION queries ON SERVER;
END
CREATE EVENT SESSION queries ON SERVER
ADD EVENT sqlserver.sql_statement_starting
(
ACTION
(
package0.collect_system_time
--, package0.event_sequence
, sqlserver.client_app_name
, sqlserver.client_hostname
--, sqlserver.database_name
, sqlserver.plan_handle
, sqlserver.sql_text
, sqlserver.username
)
WHERE sqlserver.username = N'<some username>'
AND sqlserver.database_id = 6 /* specific database */
AND sqlserver.client_hostname <> '<my machine>'
)
, ADD EVENT sqlserver.error_reported
(
ACTION
(
package0.collect_system_time
, sqlserver.client_app_name
, sqlserver.client_hostname
, sqlserver.plan_handle
, sqlserver.sql_text
, sqlserver.username
)
WHERE sqlserver.username <> N'<some username>'
/* fluff errors below */
AND error <> 5703 /* Changed language setting to %.*ls. */
AND error <> 5701 /* Changed database context to '%.*ls'. */
AND error <> 2528 /* DBCC execution completed. If DBCC printed error messages, contact your system administrator. */
AND error <> 7969 /* No active open transactions. */
--AND error <> 14205/* (unknown) */
AND error <> 4035 /* Processed %I64d pages for database '%ls', file '%ls' on file %d. */
AND error <> 18265/* Log was backed up. Database: %s, creation date(time): %s(%s), first LSN: %s, last LSN: %s, number of dump devices: %d, device information: (%s). This is an informational message only. No user action is required. */
AND error <> 3014 /* %hs successfully processed %I64d pages in %d.%03d seconds (%d.%03d MB/sec). */
AND error <> 14570/* (Job outcome) */
AND error <> 8153 /* Warning: Null value is eliminated by an aggregate or other SET operation. */
)
ADD TARGET package0.ring_buffer
(
SET max_memory = 102400
)
WITH
(
STARTUP_STATE=OFF
, TRACK_CAUSALITY = ON
);
GO
IF EXISTS
(
SELECT 1
FROM sys.server_event_sessions dxs
WHERE dxs.name = 'queries'
)
BEGIN
ALTER EVENT SESSION queries ON SERVER STATE = START;
END
Voici comment je déchiquette les résultats:
/***************************
shred the Event Data into readable form
***************************/
DECLARE @xml XML;
SELECT TOP(1) @xml = CONVERT(xml, xet.target_data)
FROM sys.dm_xe_session_targets AS xet
INNER JOIN sys.dm_xe_sessions AS xe ON (xe.address = xet.event_session_address)
WHERE xe.name = 'queries';
SELECT t.EventName
, DateStamp = DATEADD(HOUR, -6, t.EventDateStamp)
, DatabaseName = d.name
, t.ErrorNumber
, t.ErrorSeverity
, t.ErrorState
, t.ErrorMessage
, t.CollectSystemTime
, t.ClientAppName
, t.ClientHostName
, t.PlanHandle
, t.SqlText
, t.UserName
FROM (
SELECT EventName = s.value('(@name)[1]','varchar(500)')
, EventDateStamp = s.value('(@timestamp)[1]','datetime')
, DatabaseID = s.value('(data[(@name)[1] eq "source_database_id"]/value/text())[1]','varchar(255)')
, ErrorNumber = s.value('(data[(@name)[1] eq "error"]/value/text())[1]','int')
, ErrorSeverity = s.value('(data[(@name)[1] eq "severity"]/value/text())[1]','int')
, ErrorState = s.value('(data[(@name)[1] eq "state"]/value/text())[1]','int')
, ErrorMessage = s.value('(data[(@name)[1] eq "message"]/value/text())[1]','varchar(255)')
, CollectSystemTime = s.value('(action[(@name)[1] eq "collect_system_time"]/text/text())[1]','varchar(255)')
, ClientAppName = s.value('(action[(@name)[1] eq "client_app_name"]/value/text())[1]','varchar(255)')
, ClientHostName = s.value('(action[(@name)[1] eq "client_hostname"]/value/text())[1]','varchar(255)')
, PlanHandle = CONVERT(xml, s.value('(action[(@name)[1] eq "plan_handle"]/value/text())[1]','varchar(255)')).value('(plan/@handle)[1]', 'varchar(255)')
, SqlText = s.value('(action[(@name)[1] eq "sql_text"]/value/text())[1]','nvarchar(max)')
, UserName = s.value('(action[(@name)[1] eq "username"]/value/text())[1]','varchar(128)')
FROM @xml.nodes('/RingBufferTarget/event') AS xm(s)
) t
LEFT JOIN sys.databases d ON t.DatabaseID = d.database_id
ORDER BY t.UserName
, t.EventDateStamp;
OPTION (Optimize FOR (@xml = Null))
vous pouvez également utiliser OPTION (QUERYTRACEON 4130
stackoverflow.com/a/3979266/73226