博客摘录「 Sql Server 收缩日志文件原理及always on 下的实践」2024年5月22日

四、Always on 环境下实践　　

先对数据库进行完整备份：      

EXEC sp_configure 'show advanced options', 1;

RECONFIGURE;

EXEC sp_configure 'xp_cmdshell', 1;

RECONFIGURE;

DECLARE @DbName NVARCHAR(1000);

DECLARE myCursor CURSOR LOCAL STATIC

FOR

SELECT [name]

FROM sysdatabases

WHERE [name] NOT IN ( 'master', 'model', 'msdb', 'tempdb' )

AND name NOT LIKE '%test%'

AND name NOT LIKE '%bak%'

AND name NOT LIKE '%demo%'

AND version IS NOT NULL

AND version <> 0

ORDER BY [name];

OPEN myCursor;

FETCH NEXT FROM myCursor INTO @DbName;

WHILE ( @@FETCH_STATUS = 0 )

BEGIN

DECLARE @strDate AS NVARCHAR(20),

@strDateBeforeSeven AS NVARCHAR(20),

@strFileName AS NVARCHAR(255),

@strFileNameBeforeSeven AS NVARCHAR(255),

@strCommand AS NVARCHAR(255)

SET @strDate = CONVERT(NVARCHAR(20),GETDATE(),112);

SET @strDateBeforeSeven = CONVERT(NVARCHAR(20),GETDATE()-3,112); 

SET @strFileName = 'E:\daybak\['+@DbName+']_bakup_'+@strDate; 

SET @strFileNameBeforeSeven = 'E:\daybak\['+@DbName+']_bakup_'+@strDateBeforeSeven; 

EXEC ('BACKUP DATABASE ['+@DbName+'] TO DISK = ''' + @strFileName + '.bak''')

SET @strCommand = 'DEL ' + @strFileNameBeforeSeven + '.bak'

EXEC master.dbo.xp_cmdshell @strCommand

FETCH NEXT FROM myCursor INTO @DbName;

END;

CLOSE myCursor;

DEALLOCATE myCursor;　　

然后对数据库进行事务日志备份并收缩：

EXEC sp_configure 'show advanced options', 1;

RECONFIGURE;

EXEC sp_configure 'xp_cmdshell', 1;

RECONFIGURE;

DECLARE @DbName NVARCHAR(1000);

DECLARE myCursor CURSOR LOCAL STATIC

FOR

SELECT [name]

FROM sysdatabases

WHERE [name] NOT IN ( 'master', 'model', 'msdb', 'tempdb' )

AND name NOT LIKE '%test%'

AND name NOT LIKE '%bak%'

AND name NOT LIKE '%demo%'

AND version IS NOT NULL

AND version <> 0

ORDER BY [name];

OPEN myCursor;

FETCH NEXT FROM myCursor INTO @DbName;

WHILE ( @@FETCH_STATUS = 0 )BEGIN

DECLARE @strDate AS NVARCHAR(20),

@strDateBeforeSeven AS NVARCHAR(20),

@strFileName AS NVARCHAR(255),

@strFileNameBeforeSeven AS NVARCHAR(255),

@strCommand AS NVARCHAR(255)

SET @strDate = CONVERT(NVARCHAR(20),GETDATE(),112);

SET @strDateBeforeSeven = CONVERT(NVARCHAR(20),GETDATE()-3,112); 

SET @strFileName = 'E:\Log_daybak\['+@DbName+']_bakup_'+@strDate; 

SET @strFileNameBeforeSeven='E:\Log_daybak\'+@DbName+']_bakup_'+@strDateBeforeSeven; 

EXEC ('BACKUP LOG ['+@DbName+'] TO DISK = ''' + @strFileName + '.log'';USE ['+@DbName+'];DBCC SHRINKFILE(2,100);')

SET @strCommand = 'DEL ' + @strFileNameBeforeSeven + '.log'

EXEC master.dbo.xp_cmdshell @strCommand

FETCH NEXT FROM myCursor INTO @DbName;

END;

CLOSE myCursor;

DEALLOCATE myCursor;