差異備份的存儲過程
阿新 • • 發佈:2018-06-21
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有時候有這樣的需求,需要在做change前備份所有數據庫.我們可以使用挨個數據庫做全備,但是如果數據庫非常多,並且數據庫很大,這就非常麻煩,也非常耗費時間了. 所以寫了下面的存儲過程,使用遊標遍歷所有數據庫,檢查數據庫有沒有全備,如果有的話,再檢查磁盤上全備的文件是否可用,如果都沒有問題,就對數據庫做差異備份.如果檢查有問題,就把問題打印出來.
存儲過程可以接收參數作為備份路徑.如果沒有參數就使用默認路徑D:\backups\ .
使用下面的存儲過程判斷文件是否存在.
EXEC xp_fileexist @strphysical_device_name, @result output
CREATEPROCEDURE sp_generateDifferentialBackups @strBackupPath NVARCHAR (25) =‘D:\backups\‘--variable for location of DIFFERENTIAL backups AS SET NOCOUNT ON -- Get the name of all user databases DECLARE @strTimeStamp NVARCHAR(12) --variable for timestamp value DECLARE @strSQL NVARCHAR(100) --used for generating dynamic SQL statements DECLARE @databaseName NVARCHAR(128) -- used as variable to store database names DECLARE dbCursor CURSOR FOR -- used for cursor allocation SELECT NAME FROM MASTER.SYS.DATABASES WHERE [database_id] > 0 AND NAME NOT IN (‘MASTER‘,‘MODEL‘,‘MSDB‘,‘TEMPDB‘) --does not include the system databases OPEN dbCursor FETCH NEXT FROM dbCursor INTO @databaseName WHILE (@@FETCH_STATUS = 0) BEGIN PRINT ‘Checking for the latest FULL database backup for: [‘ + @databaseName +‘]‘ DECLARE @strphysical_device_name NVARCHAR(100) -- variable for physical_device_name DECLARE @cursor NVARCHAR(400) -- Reads the MSDB database to check for the latest FULL database backup SELECT @cursor=(‘DECLARE TabCursor CURSOR FAST_FORWARD GLOBAL FOR ‘ + ‘SELECT TOP 1 physical_device_name FROM msdb.dbo.backupset a INNER JOIN msdb.dbo.backupmediafamily b ON a.media_set_id = b.media_set_id WHERE database_name=‘‘‘ + @databaseName + ‘‘‘ AND type=‘‘D‘‘ ORDER BY backup_finish_date desc‘) EXEC sp_executesql @cursor OPEN TabCursor FETCH NEXT FROM TabCursor INTO @strphysical_device_name --Check if the database does not have any FULL backups at all IF @@FETCH_STATUS <> 0 BEGIN PRINT ‘*****WARNING: Database [‘ + @databaseName + ‘] does not have any FULL database backups at all. Generate the FULL database backup first. Aborting DIFFERENTIAL backup command.*****‘ END ELSE --If the database has FULL backups, WHILE @@FETCH_STATUS = 0 BEGIN DECLARE @result INT EXEC xp_fileexist @strphysical_device_name, @result output IF (@result = 1) --@result will return 1 if the specified file exists, if it doesn‘t, it will return 0 BEGIN SET @strTimeStamp=CONVERT(CHAR(8), GETDATE(), 112) SET @strTimeStamp=@strTimeStamp + REPLACE(CONVERT(CHAR(8), GETDATE(), 108),‘:‘,‘‘) EXEC (‘BACKUP DATABASE ‘ + @databaseName + ‘ TO DISK=‘‘‘ + @strBackupPath + @databaseName + ‘_DIFF_‘ + @strTimeStamp + ‘.BAK‘‘ WITH INIT, DIFFERENTIAL, DESCRIPTION=‘‘DIFFERENTIAL Backup for ‘ + @databasename + ‘ database‘‘‘) -- change this value should you decide to change the backup type to something other than differential PRINT ‘===========================================================================================‘ PRINT ‘DIFFERENTIAL Backup generated for database: [‘ + @databaseName + ‘]‘ PRINT ‘Corresponding FULL database backup: ‘ + @strphysical_device_name PRINT ‘DIFFERENTIAL database backup: ‘ + @strBackupPath + @databaseName + ‘_DIFF_‘ + @strTimeStamp + ‘.BAK‘ END ELSE PRINT ‘*********WARNING: FULL database backup file is missing. Generate the FULL database backup first. Aborting DIFFERENTIAL backup command.*********‘ FETCH NEXT FROM TabCursor INTO @strphysical_device_name END CLOSE TabCursor DEALLOCATE TabCursor PRINT ‘===========================================================================================‘ PRINT ‘ ‘ PRINT ‘ ‘ PRINT ‘ ‘ FETCH NEXT FROM dbCursor INTO @databaseName END CLOSE dbCursor DEALLOCATE dbCursor PRINT ‘FINISHED‘ GO
差異備份的存儲過程