公司一直使用YourSQLDba做本地备份，磁带机将本地备份文件上带做异地容灾备份。近期整理、验证备份时发现本地备份目录命名五花八门
其中有历史原因，也有无规划化的缘故，看着这些五花八门的目录，越看越不顺眼。于是想统一规范化。备份目录统一为DB_BACKUP，完整备份位于FULL_BACKUP子目录，事务日志备份位于LOG_BACKUP子目录下。例如如下所示：
完整备份目录 ：G:\DB_BACKUP\FULL_BACKUP\
事务日志备份目录：G:\DB_BACKUP\LOG_BACKUP\
于是需要修改YourSQLDba备份路径，本来是一个简单的事情，但是在测试过程中，发现了一些小问题，特此记录一下：
问题1：在哪里修改备份路径？ 修改是否立即生效？
修改YourSQLDba的备份路径，需要修改两个作业YourSQLDba_FullBackups_And_Maintenance 和YourSQLDba_LogBackups的配置. 即修改调用的存储过程Maint.YourSqlDba_DoMaint中的@FullBackupPath和@LogBackupPath参数。如下所示：
YourSQLDba_FullBackups_And_Maintenance作业
exec Maint.YourSqlDba_DoMaint
@oper = 'YourSQLDba_Operator'
, @MaintJobName = 'YourSQLDba: DoInteg,DoUpdateStats,DoReorg,Full backups'
, @DoInteg = 1
, @DoUpdStats = 1
, @DoReorg = 1
, @DoBackup = 'F'
, @FullBackupPath = 'G:\DB_BACKUP\FULL_BACKUP\'
, @LogBackupPath = 'G:\DB_BACKUP\LOG_BACKUP\'
-- Flush database backups older than the number of days
, @FullBkpRetDays = 1
-- Flush log backups older than the number of days
, @LogBkpRetDays = 2
-- Spread Update Stats over 7 days
, @SpreadUpdStatRun =1
-- Maximum number of consecutive days of failed full backups allowed
-- for a database before putting that database (Offline).
, @ConsecutiveFailedbackupsDaysToPutDbOffline = 9999
-- Each database inclusion filter must be on its own line between the following quote pair
, @IncDb =
'
'
-- Each database exclusion filter must be on its own line between the following quote pair
, @ExcDb =
'
'
-- Each database exclusion filter must be on its own line between the following quote pair
, @ExcDbFromPolicy_CheckFullRecoveryModel =
'
'
YourSQLDba_LogBackups作业
exec Maint.YourSqlDba_DoMaint
@oper = 'YourSQLDba_Operator'
, @MaintJobName = 'Log backups'
, @DoBackup = 'L'
, @FullBackupPath = 'G:\DB_BACKUP\FULL_BACKUP\'
, @LogBackupPath = 'G:\DB_BACKUP\LOG_BACKUP\'
-- Specify to user that full database backups are mandatory before log backups
, @NotifyMandatoryFullDbBkpBeforeLogBkp = 1
, @BkpLogsOnSameFile = 1
-- Each database inclusion filter must be on its own line between the following quote pair
, @IncDb =
'
'
-- Each database exclusion filter must be on its own line between the following quote pair
, @ExcDb =
'
'
将@FullBackupPath和 @LogBackupPath 从D:\backup\修改为G:\DB_BACKUP\FULL_BACKUP\与G:\DB_BACKUP\LOG_BACKUP\后，修改后是否立即生效？ 修改过后，如果没有先做一次完整备份，事务日志备份文件（事务日志备份有可能半小时。一小时一次等多种选择）并不会在新目录G:\DB_BACKUP\LOG_BACKUP\生成，依然还是在旧目录G:\backup\下生成。直到完整备份备份后，事务日志备份才在新目录生效。这样就导致我必须等到旧目录数据文件完全上带后才能删除旧目录。但是为什么会这样呢？
从Maint.YourSqlDba_DoMaint追查开始，发现其调用[yMaint].[Backups]做备份，做事务日志备份的一段代码如下
If @DoFullBkp = 1 And DATABASEPROPERTYEX(@DbName, 'Recovery') <> 'Simple'
Begin
Set @fileName = yMaint.MakeBackupFileName(@DbName, 'L', @LogBackupPath, @Language, @LogBkExt)
Set @sql = yMaint.MakeBackupCmd
(
@DbName
, 'L' -- say explicitely full backup command
, @fileName
, 1
, @MaintJobName
)
-- Launch first log backup that creates the file that will be used
-- to stored log backups usually for the rest of the days unless
-- end-user launch Maint.SaveDbOnNewFileSet
Exec yExecNLog.LogAndOrExec
@context = 'yMaint.backups'
, @sql = @sql
, @Info = 'Log backups (init)'
, @JobNo = @JobNo
, @errorN = @errorN_BkpPartielInit output
-- Restore the backup to the mirror server if enabled
Exec yMirroring.QueueRestoreToMirrorCmd
@context = 'yMaint.backups (queue restore of log backup init)'
, @JobNo = @JobNo
, @DbName = @DbName
, @bkpTyp = N'L'
, @fileName = @fileName
, @MirrorServer = @MirrorServer
, @BrokerDlgHandle = @BrokerDlgHandle OUT
If @errorN_BkpPartielInit = 0 -- version
Begin
Update Maint.JobLastBkpLocations
Set lastLogBkpFile = @filename
, MirrorServer = @MirrorServer
Where dbName = @DbName
-- shrink the log after backup (the procedure acts depending on the size)
-- Exec yMaint.ShrinkLog @DbName, @JobNo
End
End
其中@fileName = yMaint.MakeBackupFileName(@DbName, 'L', @LogBackupPath, @Language, @LogBkExt)取值取决于@LogBackupPath， 而@LogBackupPath来源于Maint.JobHistory中（如下所示）。每次全备在Maint.JobHistory中生成一条记录，而全备后不管事务日志备份多少次，只会在第一次事务日志备份时生成记录，所以即使修改了@FullBackupPath和 @LogBackupPath这两个参数的值，Maint.JobHistory表中最后一次事务日志备份记录的值依然为修改前的旧值。从而出现上面描述的问题。
Select
@MaintJobName = JobName
, @DoFullBkp = DoFullBkp
, @DoLogBkp = DoLogBkp
, @FullBkpRetDays = FullBkpRetDays
, @LogBkpRetDays = LogBkpRetDays
, @NotifyMandatoryFullDbBkpBeforeLogBkp = NotifyMandatoryFullDbBkpBeforeLogBkp
, @BkpLogsOnSameFile = BkpLogsOnSameFile
, @FullBackupPath = yUtl.NormalizePath(FullBackupPath )
, @LogBackupPath = yUtl.NormalizePath(LogBackupPath )
, @FullBkExt = FullBkExt
, @LogBkExt = LogBkExt
, @ConsecutiveFailedbackupsDaysToPutDbOffline = ConsecutiveFailedbackupsDaysToPutDbOffline
, @IncDb = IncDb
, @ExcDb = ExcDb
, @jobStart = JobStart
, @MirrorServer = MirrorServer
, @JobId = JobId
, @StepId = StepId
From Maint.JobHistory Where JobNo = @JobNo
问题2：修改备份路径后，原路径下的备份文件能否在保留期后自动删除？
如下所示，在存储过程[yMaint].[Backups]里面删除过期备份时，@Path参数来自于@FullBackupPath 和@LogBackupPath
这两个参数的值来源于表Maint.JobHistory， 而当修改了YourSQLDba备份路径后，如果没有做一次全备，对应记录FullBackupPath 与LogBackupPath字段的值都是原先的路径（因为事务日志备份的路径从Maint.JobHistory最后一次事务日志记录取值，也即原先的路径），做了一次全备后，其值都是修改后路径，这样就会导致以前备份删除不了的情况。此时只能手工删除。
Select
@MaintJobName = JobName
, @DoFullBkp = DoFullBkp
, @DoLogBkp = DoLogBkp
, @FullBkpRetDays = FullBkpRetDays
, @LogBkpRetDays = LogBkpRetDays
, @NotifyMandatoryFullDbBkpBeforeLogBkp = NotifyMandatoryFullDbBkpBeforeLogBkp
, @BkpLogsOnSameFile = BkpLogsOnSameFile
, @FullBackupPath = yUtl.NormalizePath(FullBackupPath )
, @LogBackupPath = yUtl.NormalizePath(LogBackupPath )
, @FullBkExt = FullBkExt
, @LogBkExt = LogBkExt
, @ConsecutiveFailedbackupsDaysToPutDbOffline = ConsecutiveFailedbackupsDaysToPutDbOffline
, @IncDb = IncDb
, @ExcDb = ExcDb
, @jobStart = JobStart
, @MirrorServer = MirrorServer
, @JobId = JobId
, @StepId = StepId
From Maint.JobHistory Where JobNo = @JobNo
问题3：输出日志文件MaintenanceReport.txt路径在哪里修改？
YourSQLDba的输出日志文件MaintenanceReport.txt并不会随着@FullBackupPath和 @LogBackupPath 的修改会保存到新目录。这个文件的输出目录的值放置在msdb.dbo.sysjobsteps表中，对应记录的output_file_name字段。
可以通过两种方式来修改：
1 SQL脚本方式：
EXEC msdb.dbo.sp_update_jobstep @job_id=N'41662692-c7b2-47ae-8e07-df3eb12e1fe2', @step_id=1 ,
@output_file_name=N'G:\DB_BACKUP\MaintenanceReport.txt'
2：UI图形界面：
问题4：是否可以用其它方式。
可以修改@FullBackupPath和 @LogBackupPath参数值后，将旧备份文件拷贝到对应新目录，不过对备份比较大的服务器，会产生一定的IO消耗。修改修改Maint.JobLasstBkpLocations记录中的LastLogBkpFile和LastFullBkpFile字段, 以及Maint.JobHistory中最后一条记录的FullBackupPath与LogBackupPath。
UPDATE Maint.JobLastBkpLocations set lastLogBkpFile='G:\DB_BACKUP\LOG_BACKUP\xxxx_[2014-07-15_17h48m08_Tue]_logs.TRN',
lastFullBkpFile='G:\DB_BACKUP\FULL_BACKUP\xxxx_[2014-07-15_17h48m07_Tue]_database.BAK'
WHERE .....
UPDATE Maint.JobHistory SET FullBackupPath='G:\DB_BACKUP\LOG_BACKUP\', LogBackupPath='G:\DB_BACKUP\FULL_BACKUP' where JobNo=@JobNo
