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Archives of the TeradataForum
Message Posted: Mon, 24 Sep 2012 @ 21:52:16 GMT
| Subj: | | Re: Rolforward to checkpoint from a Journal |
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| From: | | Bakthavachalam, Roopalini |
Anomy.Anom wrote:
| | Then ROLLFORWARD will stop at the first CHKMON it finds in the restored journal, even if that was from weeks ago, unless you use the event
ID reported by the Checkpoint command. | |
| | When you use permanent journals, you are responsible not only for checkpointing "active" to "saved" subtable so you can archive, but also
explicitly deleting "saved" records from the journal when appropriate. ROLLFORWARD / ROLLBACK by default delete the "restored" subtable, but
ARCHIVE JOURNAL never deletes the "saved" subtable. Note that DELETE JOURNAL purges the entire subtable, there is no way to filter selected
records. | |
| | While you could opt to purge journal records every time you archive the journal, you typically will want to accumulate checkpoints in
"saved" until your next full backup. For example, a weekly job might: archive the table but retain the lock, checkpoint with save and archive the
journal , delete the saved journal, then release the lock on the table. | |
Hi,
I didn't understand it clearly. Could you elaborate more. Or could you
please explain with an example?
Thanks
Roopalini
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