SQLServer 2005&08镜像导致日志文件LDF过大的问题解决

镜像是一个很好的灾难恢复手段，配置简单，切换快速。网上教如何配置的文章很多，这里介绍下如何处理LDF过大导致磁盘撑爆的情况。

首先要明确的是镜像不能清日志的, 镜像是的工作跟日志是有关联的。常用的.清空日志DUMP TRANSACTION 'db_name' WITH NO_LOG;和截断事务日志BACKUP LOG 'db_name' WITH NO_LOG;都是无效的。

1建立多个日志文件，以免单个日志文件撑爆

2根据日志的增长情况，经常备份日志 BACKUP LOG DB_Name to disk = 'X:\DB_Name_Log.log'

3 收缩日志 DBCC SHRINKFILE (Log_Name)，但是这个几乎没用。不过经过备份后，日志文件内部已经截断了，及时备份可以截断活动日志，让日志文件内标内记非活动的虚文件可重复使用.

查询日志的使用情况以及在被那些应用占用

dbcc sqlperf(logspace)

go

Database Name                                                                                                                    Log Size (MB) Log Space Used (%) Status

--------------------------------------------------------------------------------------------------------------

DB_Name      77404.91      9.809758           0

select name, recovery_model_desc, log_reuse_wait,log_reuse_wait_desc from sys.databases

name     recovery_model_desc  log_reuse_wait log_reuse_wait_desc

--------------------------------------------------------------------------------------------------------------

master   SIMPLE                                                       0              NOTHING
tempdb                                                                                                                           SIMPLE                                                       1              CHECKPOINT
model                                                                                                                            FULL                                                         0              NOTHING

msdb                                                                                                                             SIMPLE                                                       1              CHECKPOINT

DB_Name                      FULL                             5              DATABASE_MIRRORING

Backup            FULL                  4              ACTIVE_TRANSACTION

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