Uncommitted Transaction

Oct 19, 2007



Dear friends,

Transaction means the actions user perform in a database, like create table, update, select. Is that correct? Can back up or restore be transactions?

I recently read the tool-kit book and encountered 'uncommitted transactions' many times, esp. in the chapter of 'Backup and Recovery'. For example, today I wanna backup my database by backuping a full database, then three hours later performing a differential backup, and five mins later do transaction log backup. Then I restore those backups following the same sequence. When I restore diferential backup and log backup, I have the option to use one of the three options:

Leave the database ready for use by rolling back the uncommitted transactions. Additional transaction logs cannot be restored. (RESTORE WITH RECOVERY)



Leave the database non-operational, and do not roll back the uncommitted transactions. Additional transaction logs can be restored. (RESTORE WITH NORECOVERY)



Leave the database in read-only mode. Undo uncommitted transactions, but save the undo actions in a standby file so that recovery effects can be reverted. (RESTORE WITH STANDBY)


In the definitions above, 'uncommitted transactions' are all mentioned.

I do not understand why uncommitted transaction happned during or before or after backup( in my opinion, all transactions should be committed before you doing backup)? Can you please give me an example?



Thank you

Julian

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