sys.fn_dblog返回当前数据库日志的活动部分的内容
use db1
go
if exists(select 1 from sys.tables where name='t')
drop table t
go
create table t(col int)
go
dbcc traceon(3505, -1)---disable automatic checkpoint behaviorhttp://support.microsoft.com/kb/815436/en-us
go
checkpoint
go
select [Current LSN],[Previous LSN],[Previous Page LSN],PartitionId, Operation,Context,[Transaction ID],[Log Record Fixed Length],[Log Record Length] from sys.fn_dblog(null,null)
go
insert into t values(1)--
go
select [Current LSN],[Previous LSN],[Previous Page LSN],PartitionId, Operation,Context,[Transaction ID],[Log Record Fixed Length],[Log Record Length] from sys.fn_dblog(null,null)—-sql server need to allocate space for the new table
go
checkpoint
go
insert into t values(1)—-
go
select [Current LSN],[Previous LSN],[Previous Page LSN],PartitionId, Operation,Context,[Transaction ID],[Log Record Fixed Length],[Log Record Length] from sys.fn_dblog(null,null)—-only insert operation
go
if exists(select 1 from sys.tables where name='t')
drop table t
go
create table t(col int)
go
dbcc traceon(3505, -1)---disable automatic checkpoint behaviorhttp://support.microsoft.com/kb/815436/en-us
go
checkpoint
go
select [Current LSN],[Previous LSN],[Previous Page LSN],PartitionId, Operation,Context,[Transaction ID],[Log Record Fixed Length],[Log Record Length] from sys.fn_dblog(null,null)
go
insert into t values(1)--
go
select [Current LSN],[Previous LSN],[Previous Page LSN],PartitionId, Operation,Context,[Transaction ID],[Log Record Fixed Length],[Log Record Length] from sys.fn_dblog(null,null)—-sql server need to allocate space for the new table
go
checkpoint
go
insert into t values(1)—-
go
select [Current LSN],[Previous LSN],[Previous Page LSN],PartitionId, Operation,Context,[Transaction ID],[Log Record Fixed Length],[Log Record Length] from sys.fn_dblog(null,null)—-only insert operation
http://support.microsoft.com/kb/815436/en-us
2008 的操作日志怎么解析，特别是 LOP_MODIFY_ROW 操作？ 与 LOP_INSERT_ROWS LOP_DELETE_ROWS 不同
数据库的insert,udpate,delte操作会记录在日志里，
对于insert操作，会产生after image，也就是变更后的结果，
对于delete/update操作，会产生before image(记录变更前的信息）和after image（记录变更后的信息）
通过before image和 after image就可以找到数据变更前和变更后的状态，从而用于数据库恢复，或者事物的回滚。
你可以进行一些insert,update,deltet操作，观察
[RowLog Contents 0]
,[RowLog Contents 1]