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 Does transaction log contain data or commands
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Posting Yak Master

United Kingdom
180 Posts

Posted - 07/25/2014 :  10:18:37  Show Profile  Reply with Quote
Hi all,

What does the transaction log actually contain?

Is it each individual data row that is inserted/modified?

Or the command that modified the data?

I'm guessing it's the former


Constraint Violating Yak Guru

252 Posts

Posted - 07/25/2014 :  10:34:19  Show Profile  Reply with Quote
It contains information about everything done in your db for rollback and roll forward purposes

-- take a look
FROM fn_dblog (null, null);

-- some good links
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Flowing Fount of Yak Knowledge

United Kingdom
2179 Posts

Posted - 07/26/2014 :  03:04:39  Show Profile  Visit jackv's Homepage  Reply with Quote
According to SQL Server BOL;supplied the SQL Server Books Online :
1) The start and end of each transaction
2) Every data modification (insert, update, or delete). This includes changes by system stored procedures or data definition language (DDL) statements to any table, including system tables.
3) Every extent and page allocation or deallocation.
4) Creating or dropping a table or index
5) Rollback operations
6) Transaction SID

Also , check:

Jack Vamvas
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