问题
I need to view the transaction logs of a database on SQL Server 2008 in order to find a delete transaction and hopefully roll it back.
Unfortunately I have no clue where to start, and I\'m finding it difficult to determine which are good articles on Google.
What should I do?
回答1:
You could use the undocumented
DBCC LOG(databasename, typeofoutput)
where typeofoutput:
0: Return only the minimum of information for each operation -- the operation, its context and the transaction ID. (Default)
1: As 0, but also retrieve any flags and the log record length.
2: As 1, but also retrieve the object name, index name, page ID and slot ID.
3: Full informational dump of each operation.
4: As 3 but includes a hex dump of the current transaction log row.
For example, DBCC LOG(database, 1)
You could also try fn_dblog.
For rolling back a transaction using the transaction log I would take a look at Stack Overflow post Rollback transaction using transaction log.
回答2:
You can't read the transaction log file easily because that's not properly documented. There are basically two ways to do this. Using undocumented or semi-documented database functions or using third-party tools.
Note: This only makes sense if your database is in full recovery mode.
SQL Functions:
DBCC LOG and fn_dblog - more details here and here.
Third-party tools:
Toad for SQL Server and ApexSQL Log.
You can also check out several other topics where this was discussed:
Rollback transaction using transaction log
SQL Server Transaction Log Explorer/Analyzer
Read the log file (*.LDF) in SQL Server 2008
回答3:
I accidentally deleted a whole bunch of data in the wrong environment and this post was one of the first ones I found.
Because I was simultaneously panicking and searching for a solution, I went for the first thing I saw - ApexSQL Logs, which was $2000 which was an acceptable cost.
However, I've since found out that Toad for Sql Server can generate undo scripts from transaction logs and it is only $655.
Lastly, found an even cheaper option SysToolsGroup Log Analyzer and it is only $300.
来源：https://stackoverflow.com/questions/4507509/how-to-view-transaction-logs-in-sql-server-2008