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前言：有時候，一個數據庫有多個帳號，包括數據庫管理員，開發人員，運維支撐人員等，可能有很多帳號都有比較大的權限，例如DDL操作權限(創建，修改，刪除存儲過程，創建，修改，刪除表等），賬戶多了，管理起來就會相當麻煩，容易產生混亂，如果數據庫管理員不監控數據庫架構變更的話，就不知道誰對數據庫架構做了啥改動（此處改動僅僅只DDL操作），尤其有時候，有些開發人員可能不按規章制度辦事，繞過或忘了通知發布人員或DBA，直接去生產機做一些DDL操作，那么我們就需要對數據庫架構某些更改的事件進行監控，如果能夠監控并留下證據，這樣既可以讓DBA或相關管理人員知曉這些變更，有效管理數據庫，也可以避免出現問題，出現扯皮現象，最后DBA成了背黑鍋的。

下面就是一個解決上述問題的方案，我們通過創建一個表DatabaseLog和DDL觸發器來解決問題，首先在msdb數據庫里面新建一個表DatabaseLog，用來保存DDL觸發器獲取的信息。其中DDL觸發器主要通過EVENTDATA()函數返回有關服務器或數據庫事件的信息。

復制代碼代碼如下:

USE msdb;
GO
CREATE TABLE [dbo].[DatabaseLog]
(
    [DatabaseLogID]   [int]    IDENTITY(1,1) NOT NULL,
    [PostTime]        [datetime] NOT NULL,
    [DatabaseUser]    [sysname] COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
    [LoginName]       [sysname] COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
    [ClientHost]      [sysname] COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
    [Event]           [sysname] COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
    [Schema]          [sysname] COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
    [Object]          [sysname] COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
    [TSQL]            [nvarchar](max) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
    [XmlEvent]        [xml] NOT NULL,
CONSTRAINT [PK_DatabaseLog_DatabaseLogID] PRIMARY KEY NONCLUSTERED
(
    [DatabaseLogID] ASC
)WITH (PAD_INDEX= OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'Primary key for DatabaseLog records.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'COLUMN',@level2name=N'DatabaseLogID'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'The date and time the DDL change occurred.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'COLUMN',@level2name=N'PostTime'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'The user who implemented the DDL change.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'COLUMN',@level2name=N'DatabaseUser'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'The login which implemented the DDL change.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'COLUMN',@level2name=N'LoginName'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'The client machine on which implemented the DDL change.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'COLUMN',@level2name=N'ClientHost'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'The type of DDL statement that was executed.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'COLUMN',@level2name=N'Event'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'The schema to which the changed object belongs.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'COLUMN',@level2name=N'Schema'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'The object that was changed by the DDL statment.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'COLUMN',@level2name=N'Object'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'The exact Transact-SQL statement that was executed.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'COLUMN',@level2name=N'TSQL'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'The raw XML data generated by database trigger.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'COLUMN',@level2name=N'XmlEvent'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'Audit table tracking all DDL changes made to the database. Data is captured by the database trigger ddlDatabaseTriggerLog.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog'
GO
EXEC sys.sp_addextendedproperty@name=N'MS_Description', @value=N'Primary key (nonclustered) constraint' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'DatabaseLog', @level2type=N'CONSTRAINT',@level2name=N'PK_DatabaseLog_DatabaseLogID'
GO

例如，我要監控數據庫MyAssistant的DDL操作，那么我們首先在“數據庫郵件”里面創建一個配置名為“ DataBase_DDL_Event”的配置文件（profile name）,這個就不多講了，不知道配置的，自己先練練手把，假如我需要讓數據庫把監控到DDL操作變動相信信息發送到我的郵箱 *****@***.com(用你自己的郵箱替代)，那么只需要修改下面代碼的郵箱和profile_name即可。

復制代碼代碼如下:

USE MyAssistant;
GO

CREATE TRIGGER [DTG_DatabaseDdlTriggerLog]
ON DATABASE
FOR DDL_DATABASE_LEVEL_EVENTS
AS
BEGIN
    SET NOCOUNT ON;

    DECLARE @data XML;
    DECLARE @schema sysname;
    DECLARE @object sysname;
    DECLARE @eventType sysname;
    DECLARE @tableHTML NVARCHAR(MAX) ;

    SET @data = EVENTDATA();
    SET @eventType = @data.value('(/EVENT_INSTANCE/EventType)[1]', 'sysname');
    SET @schema = @data.value('(/EVENT_INSTANCE/SchemaName)[1]', 'sysname');
    SET @object = @data.value('(/EVENT_INSTANCE/ObjectName)[1]', 'sysname')

    IF @object IS NOT NULL
        PRINT ' ' + @eventType + ' - ' + @schema + '.' + @object;
    ELSE
        PRINT ' ' + @eventType + ' - ' + @schema;

    IF @eventType IS NULL
        PRINT CONVERT(nvarchar(max), @data);

    INSERT [msdb].[dbo].[DatabaseLog]
        (
        [PostTime],
        [DatabaseUser],
        [LoginName],
        [ClientHost],
        [Event],
        [Schema],
        [Object],
        [TSQL],
        [XmlEvent]
        )
    VALUES
        (
        GETDATE(),
        CONVERT(sysname, CURRENT_USER),
        @data.value('(/EVENT_INSTANCE/LoginName)[1]', 'nvarchar(max)'),
        CONVERT(sysname, HOST_NAME()),
        @eventType,
        CONVERT(sysname, @schema),
        CONVERT(sysname, @object),
        @data.value('(/EVENT_INSTANCE/TSQLCommand)[1]', 'nvarchar(max)'),
        @data
        );

    SET @tableHTML =
    N'<H1>DDL Event</H1>' +
    N'<table border="0">' +
    N'<tr><th>Post Time</th><th>User</th><th>Login</th><th>ClientHost</th>' +
    N'<th>TSQL</th><th></tr>' +
    CAST(( SELECT
    td = PostTime,       '',
    td = DatabaseUser, '',
    td = LoginName, '',
    td = ClientHost, '',
    td = TSQL, ''
    FROM msdb.dbo.DatabaseLog
    WHERE DatabaseLogID =(select max(DatabaseLogID) from msdb.dbo.DatabaseLog)
    FOR XML PATH('tr'), TYPE     ) AS NVARCHAR(MAX) ) +     N'</table>' ;

    EXEC msdb.dbo.sp_send_dbmail
             @profile_name = 'DataBase_DDL_Event',
        @recipients='***@***.com',
        @subject = 'DDL Event - DataBase MyAssistant',
        @body = @tableHTML,
        @body_format = 'HTML' ;
END;
GO