September 2010
Intermediate to advanced
1704 pages
111h 8m
English
book
Microsoft® SQL Server 2008 R2 Unleashed
by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft® SQL Server 2008 R2 Unleashed
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How SQL Server Manages Transactions
SQL Server uses the database’s transaction log to record the modifications that occur within the database. Each log record is labeled with a unique log sequence number (LSN), and all log entries that are part of the same transaction are linked together so that they can be easily located if the transaction needs to be undone or redone. The primary responsibility of logging is to ensure transaction durability—either ensuring that the completed changes make it to the physical database files or ensuring that any unfinished transactions are rolled back in the event of an error or a server failure.
What is logged? Obviously, the start and end of a transaction are logged, but SQL Server also logs the actual data ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.