SQL Server误删表恢复

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易语随风去 2018-06-30 17:12:37 ©著作权

文章标签 SQL Server 误删表 fn dblog 文章分类 SQL Server 数据库

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SQL Server 完全恢复模式 下恢复误删除的表，进行精准恢复

1. 找出被删除的表名(无schema，需要从日志中分析进行提取，后续完善)、object_id、表所在数据库、删除人、删除时间等

declare @database_name varchar(200),@type varchar(2),@pass_hours int,
select @database_name='AdventureWorks2014',@pass_hours=-48
declare @file_path sql_variant
select @file_path=value from fn_trace_getinfo(0) where property=2 and traceid=1
SELECT max(gt.HostName) as 'LoginHostName'
,max(gt.ApplicationName) as 'ApplicationName'
,max(gt.LoginName) as 'LoginName'
,min(gt.StartTime) as 'MinStartTime'
,max(gt.StartTime) as 'MaxStartTime'
,gt.ObjectID
,max(gt.ServerName) as 'DBServerName'
,max(gt.ObjectName) as 'ObjectName'
,max(gt.DatabaseName) as 'DatabaseName'
,max(sv.subclass_name) as 'subclass_name'
,max(e.name) as 'OperationType'
FROM fn_trace_gettable(convert(varchar(2000),@file_path), DEFAULT) gt 
LEFT JOIN sys.trace_subclass_values sv 
ON gt.[eventclass] = sv.[trace_event_id] AND sv.[subclass_value] = gt.[objecttype] 
INNER JOIN sys.trace_events e 
ON gt.[eventclass] = e.[trace_event_id] 
INNER JOIN sys.trace_categories c 
ON e.[category_id] = c.[category_id] 
WHERE StartTime>=dateadd(HOUR,@pass_hours,getdate()) and StartTime<=getdate()
and [eventclass]=47 --drop talbe/index
and databasename=@database_name
and subclass_name='U'
group by gt.ObjectID

SQL Server误删表恢复_Server

2. 通过删除时间确定相关信息被记录在哪个日志文件上

select * from msdb.dbo.backupmediafamily where media_set_id=(
select top 1 media_set_id from msdb.dbo.backupset 
where database_name=@database_name
and backup_finish_date>=@max_start_time
and type='L' order by backup_finish_date)

SQL Server误删表恢复_Server_02

3. 从日志文件提取lsn相关信息

declare @lockinfo varchar(100)
set @lockinfo='%SCH_M OBJECT%:'+@ObjectID+':%'
select [Transaction id],'lsn:0x'+[Current LSN] 
from fn_dump_dblog (
        NULL, NULL, N'DISK', 1, @backupfile,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT) as a
where convert(datetime,[Begin Time])
between dateadd(ss,-5,@min_start_time) and dateadd(ss,5,@max_start_time)
and [Transaction Name]='DROPOBJ'
and exists(select 1 from fn_dump_dblog (
        NULL, NULL, N'DISK', 1, @backupfile,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT,
        DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT, DEFAULT)
        where [Transaction id]=a.[Transaction id] and [Lock Information] like @lockinfo)