DBCC CHECKDB用法 手工修复数据库
快速修复 DBCC CHECKDB ('数据库名', REPAIR_FAST) 重建索引并修复 DBCC CHECKDB ('数据库名', REPAIR_REBUILD) 如果必要允许丢失数据修复 DBCC CHECKDB ('数据库名'', REPAIR_ALLOW_DATA_LOSS) 如果出现错误:未处理修复语句。数据库需处于单用户模式下。
快速修复
DBCC CHECKDB ('数据库名', REPAIR_FAST)
重建索引并修复
DBCC CHECKDB ('数据库名', REPAIR_REBUILD)
如果必要允许丢失数据修复
DBCC CHECKDB ('数据库名'', REPAIR_ALLOW_DATA_LOSS)
如果出现错误:未处理修复语句。数据库需处于单用户模式下。
可以先启用单用户模式,方法如下执行存储过程:
Use master
go
sp_dboption 数据库名, single, true
--更改成单用户
alter database ams2 set single_user with rollback immediate
--还原数据库为多用户模式
alter database ams2 set multi_user with rollback immediate
############################################################
############################################################
手工修复数据库试例
操作步骤:
----------------------------------------------------------------------------------------------
进入SQL查询分析器,执行语句:
--检查数据库完整性
dbcc checkdb('ams1')
执行结果:
---------------------------------------------------------------
CHECKDB 发现了 0 个分配错误和 11 个一致性错误(在数据库 'ams1' 中)。
repair_allow_data_loss 是最低的修复级别(对于由 DBCC CHECKDB (ams1 ) 发现的错误而言)。
DBCC 执行完毕。如果 DBCC 输出了错误信息,请与系统管理员联系。
说明数据库确实有问题,11个错误,找到错误地方:
-------------------------------------------------------------------------------
对象 'Tb_Archives_File_1' 有 3777 行,这些行位于 172 页中。
CHECKDB 发现了 0 个分配错误和 2 个一致性错误(在表 'Tb_Archives_File_1' 中,该表的对象 ID 为 907150277)。
表明 'Tb_Archives_File_1' 表确实有2个错误,难怪一查询就要死机,于是运行语句进行表修复:
--------------------------------------------------------------------------------------
--以repair_allow_data_loss级别修复表
dbcc checktable('Tb_Archives_File_1',repair_allow_data_loss)
go
执行结果:
服务器: 消息 7919,级别 16,状态 3,行 2
未处理修复语句。数据库需要处于单用户模式下。
DBCC 执行完毕。如果 DBCC 输出了错误信息,请与系统管理员联系。
---------------------------------------------------------------------------------------------------
需要将数据库改为"单用户模式",于是再执行:
--更改成单用户
alter database ams2 set single_user with rollback immediate
go
--已repair_allow_data_loss级别修复表
dbcc checktable('Tb_Archives_File_1',repair_allow_data_loss)
go
--若还有问题,修复索引表
DBCC DBREINDEX('Tb_Archives_File_1')
--再修复表
DBCC CHECKTABLE('Tb_Archives_File_1')
直到返回的结果没有错误!
--查询是否正常
select * from Tb_Archives_File_1
再查询那张错误表,不报错,也不死机了,数据也完好无损.....哈哈....
--还原数据库为多用户模式
alter database ams2 set multi_user with rollback immediate

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