Utworzyć wyzwalacz, aby rejestrować kod SQL, którego dotyczy tabela?

Zdaję sobie sprawę, że ten problem został już rozwiązany, ale interesowało mnie, jak można go rozwiązać za pomocą zdarzeń rozszerzonych SQL Server 2008. To moja pierwsza gra z XEvents, więc jestem pewien, że jest wiele do ulepszenia!

Skrypt do konfiguracji testowej bazy danych

CREATE TABLE [dbo].[TableWithMysteryUpdate](
    [Period] [int] NOT NULL,
    [ColumnThatWillBeUpdated] [int]  NOT NULL
) ON [PRIMARY]
GO
INSERT [dbo].[TableWithMysteryUpdate] ([Period], [ColumnThatWillBeUpdated]) VALUES (1, 20)
INSERT [dbo].[TableWithMysteryUpdate] ([Period], [ColumnThatWillBeUpdated]) VALUES (2, 23)

GO

CREATE TABLE [dbo].[TestTable](
    [foo] [int] IDENTITY(1,1) NOT NULL,
    [bar] [nchar](10) NOT NULL,
 CONSTRAINT [PK_TestTable] PRIMARY KEY CLUSTERED 
(
    [foo] ASC
)
)
GO

CREATE TRIGGER [dbo].[triggerCausingMysteryUpdate] 
   ON  [dbo].[TestTable] 
   AFTER INSERT
AS 
BEGIN
    SET NOCOUNT ON;
UPDATE [dbo].[TableWithMysteryUpdate]
   SET [Period] = [Period]+1

END
GO

CREATE PROCEDURE [dbo].[Proc4]
AS
BEGIN
INSERT INTO [dbo].[TestTable]
           (
           [bar])
     VALUES
           ('Test')
END

GO

CREATE PROCEDURE [dbo].[Proc3]
AS
BEGIN
EXEC dbo.Proc4
END
GO

CREATE PROCEDURE [dbo].[Proc2]
AS
BEGIN
EXEC dbo.Proc3
END
GO

CREATE PROCEDURE [dbo].[Proc1]
AS
BEGIN
EXEC dbo.Proc2
END

Scenariusz jest więc taki, że TableWithMysteryUpdate jest aktualizowany, ale nie jestem pewien, o co. Dodam wyzwalacz aktualizacji, który nic nie robi, aby móc filtrować ten obiekt.

CREATE TRIGGER [dbo].[triggerAfterUpdate] 
   ON  [dbo].[TableWithMysteryUpdate] 
   AFTER UPDATE
AS 
BEGIN
    SET NOCOUNT ON;

END

Następnie uruchom skrypt, aby utworzyć sesję XEvents, uruchom procedurę, która ostatecznie wyłączy stos wywołań, powodując aktualizację, a następnie zatrzymaj sesję.

USE TestDB    

DECLARE @DynSql nvarchar(max)

SET @DynSql = '

IF EXISTS(SELECT * FROM sys.server_event_sessions WHERE name=''test_trace'')
    DROP EVENT SESSION [test_trace] ON SERVER;
CREATE EVENT SESSION [test_trace]
ON SERVER
ADD EVENT sqlserver.sql_statement_completed(
     ACTION (package0.callstack, sqlserver.session_id, sqlserver.sql_text, sqlserver.tsql_stack)
     WHERE (object_id = ' + cast(object_id('[dbo].[triggerAfterUpdate]') as varchar(10)) + ') 
     )
,
ADD EVENT sqlserver.sp_statement_completed(
     ACTION (package0.callstack, sqlserver.session_id, sqlserver.sql_text, sqlserver.tsql_stack)
     WHERE (object_id = ' + cast(object_id('[dbo].[triggerAfterUpdate]') as varchar(10)) + ') 
     )
ADD TARGET package0.asynchronous_file_target
(set filename = ''c:\temp\test_trace.xel'' , metadatafile = ''c:\temp\test_trace.xem'')
ALTER EVENT SESSION [test_trace] ON SERVER STATE = START
'

EXEC sp_executesql @DynSql
GO

EXEC  dbo.Proc1

GO

ALTER EVENT SESSION [test_trace] ON SERVER STATE = STOP

Dane śledzenia można odczytać za pomocą

SELECT CONVERT (XML, event_data) AS data
        FROM sys.fn_xe_file_target_read_file ('C:\Temp\test_trace*.xel', 'C:\Temp\test_trace*.xem', NULL, NULL)

Część stosu wywołań to

 <action name="tsql_stack" package="sqlserver">
    <value>&lt;frame level='1' handle='0x03000800E8EA0D0612E4EB00A59D00000000000000000000' line='6' offsetStart='228' offsetEnd='264'/&gt;
&lt;frame level='2' handle='0x03000800921155002C81E700A59D00000000000000000000' line='8' offsetStart='258' offsetEnd='398'/&gt;
&lt;frame level='3' handle='0x03000800CB3549012F81E700A59D00000100000000000000' line='5' offsetStart='90' offsetEnd='284'/&gt;
&lt;frame level='4' handle='0x03000800045A3D022F81E700A59D00000100000000000000' line='5' offsetStart='90' offsetEnd='120'/&gt;
&lt;frame level='5' handle='0x030008003D7E31033081E700A59D00000100000000000000' line='5' offsetStart='90' offsetEnd='120'/&gt;
&lt;frame level='6' handle='0x0300080076A225043081E700A59D00000100000000000000' line='5' offsetStart='90' offsetEnd='120'/&gt;
&lt;frame level='7' handle='0x010008002E775203603D9A0D000000000000000000000000' line='2' offsetStart='4' offsetEnd='-1'/&gt;</value>
    <text />
  </action>

Dołączanie do DMV

WITH CapturedResults AS
    ( SELECT data.value ( '(/event/@timestamp)[1]', 'DATETIME')                                        AS [TIME],
        data.value ( '(/event/data[@name=''cpu'']/value)[1]', 'INT')                                   AS [CPU (ms)],
        CONVERT (FLOAT, data.value ('(/event/data[@name=''duration'']/value)[1]', 'BIGINT')) / 1000000 AS [Duration (s)],
        data.value ( '(/event/action[@name=''sql_text'']/value)[1]', 'VARCHAR(MAX)')                   AS [SQL STATEMENT],
        CAST(data.value('(/event/action[@name="tsql_stack"]/value)[1]','varchar(MAX)') AS XML)         AS [stack_xml]
    FROM (SELECT CONVERT (XML, event_data) AS                                                             data
        FROM sys.fn_xe_file_target_read_file ('C:\Temp\test_trace*.xel', 'C:\Temp\test_trace*.xem', NULL, NULL)
        )
        entries
    )
    ,
    StackData AS
    ( SELECT frame_xml.value('(./@level)', 'int')      AS [frame_level],
        frame_xml.value('(./@handle)', 'varchar(MAX)') AS [sql_handle],
        frame_xml.value('(./@offsetStart)', 'int')     AS [offset_start],
        frame_xml.value('(./@offsetEnd)', 'int')       AS [offset_end]
    FROM CapturedResults CROSS APPLY stack_xml.nodes('//frame') N (frame_xml)
    )
SELECT sd.frame_level,
    object_name(st.objectid, st.dbid) AS ObjectName,
    SUBSTRING(st.text, (sd.offset_start/2)+1, ((
            CASE sd.offset_end
                WHEN -1
                THEN DATALENGTH(st.text)
                ELSE sd.offset_end
            END - sd.offset_start)/2) + 1) AS statement_text,
    qp.query_plan,
    qs2.creation_time,
    qs2.last_execution_time,
    qs2.execution_count
FROM StackData AS sd CROSS APPLY sys.dm_exec_sql_text(CONVERT(VARBINARY(MAX),sd.sql_handle,1)) AS st
    LEFT OUTER JOIN sys.dm_exec_query_stats qs2
    ON  qs2.sql_handle = CONVERT(VARBINARY(MAX),sd.sql_handle,1) OUTER APPLY sys.dm_exec_query_plan(CONVERT(VARBINARY(MAX),qs2.plan_handle,1)) AS qp

daje wyniki (pokazuje cały stos wywołań tsql)