Wie kann ich diese Extended Events XML so schnell wie möglich zerkleinern?

Ich habe eine Extended Events-Sitzung in SQL Server 2008 R2 erstellt. Die Sitzung wird ausgeführt und sammelt Ereignisse, sobald sie eintreten, genau so, wie Sie es erwarten würden.

Wenn ich die XML-Datei bei relativ wenigen Ereignissen zerkleinere, ist die Leistung akzeptabel. Wenn ich Tausende von Ereignissen habe, dauert es ewig, die XML zu zerkleinern.

Ich weiß, dass ich etwas falsch mache. Ich habe einfach nicht genug Kenntnisse über die Interna der XML-Engine, um zu verstehen, was passiert.

Dies ist die Definition meiner Extended Events-Sitzung:

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

So zerkleinere ich die Ergebnisse:

/***************************

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;

Vielen Dank an @Tom V für die Identifizierung dieses Blogposts , der die Notwendigkeit einer temporären Tabelle identifiziert.

Das Anpassen der Ideen im Blogpost geht jetzt sehr schnell:

/***************************

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';

IF OBJECT_ID('tempdb..#xmlResults') IS NOT NULL
DROP TABLE #xmlResults;

CREATE TABLE #xmlResults
(
    RowNum INT NOT NULL
        PRIMARY KEY CLUSTERED
        IDENTITY(1,1)
    , xeXML XML NOT NULL
);

INSERT INTO #xmlResults (xeXML)
SELECT xm.s.query('.')
FROM @xml.nodes('/RingBufferTarget/event') AS xm(s)
OPTION (Optimize FOR (@xml = Null)); -- Useful for SQL 2008

SELECT *
FROM #xmlResults

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 =          xeXML.value('(event/@name)[1]','varchar(500)')
            , EventDateStamp =      xeXML.value('(event/@timestamp)[1]','datetime')
            , DatabaseID =          xeXML.value('(event/data[(@name)[1] eq "source_database_id"]/value/text())[1]','varchar(255)')
            , ErrorNumber =         xeXML.value('(event/data[(@name)[1] eq "error"]/value/text())[1]','varchar(255)')
            , ErrorSeverity =       xeXML.value('(event/data[(@name)[1] eq "severity"]/value/text())[1]','varchar(255)')
            , ErrorState =          xeXML.value('(event/data[(@name)[1] eq "state"]/value/text())[1]','varchar(255)')
            , ErrorMessage =        xeXML.value('(event/data[(@name)[1] eq "message"]/value/text())[1]','varchar(255)')
            , CollectSystemTime =   xeXML.value('(event/action[(@name)[1] eq "collect_system_time"]/text/text())[1]','varchar(255)')
            , ClientAppName =       xeXML.value('(event/action[(@name)[1] eq "client_app_name"]/value/text())[1]','varchar(255)')
            , ClientHostName =      xeXML.value('(event/action[(@name)[1] eq "client_hostname"]/value/text())[1]','varchar(255)')
            , PlanHandle = CONVERT(xml, xeXML.value('(event/action[(@name)[1] eq "plan_handle"]/value/text())[1]','varchar(255)')).value('(plan/@handle)[1]', 'varchar(255)')
            , SqlText =             xeXML.value('(event/action[(@name)[1] eq "sql_text"]/value/text())[1]','nvarchar(max)')
            , UserName =            xeXML.value('(event/action[(@name)[1] eq "username"]/value/text())[1]','varchar(128)')
        FROM #xmlResults xm
    ) t
    LEFT JOIN sys.databases d ON t.DatabaseID = d.database_id
ORDER BY t.UserName
    , t.EventDateStamp;