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IDS Forum

Re: Restore + Logical log - caution

Posted By: George_Palmer@aotx.uscourts.gov
Date: Friday, 20 January 2012, at 3:48 p.m.

In Response To: Re: Restore + Logical log - caution (MARK JALKIEWICZ)

I don't write the engine. I don't even work for IBM.

But, when you start an archive, what is in the DB at the start of an
archive. I have no doubt that some pages have a timestamp prior to the
start of the archive ( so they need to be included in the archive ) but
also have rows on them that have yet to be committed. Think about LRU and
all the other pieces of the DB engine.

Now assume that after the start of the archive and after the end of the
archive that the user causes the transaction to be rolled back. All the
changed rows that were part of that transaction are put back to what they
looked like prior to the start of the transaction....... by using the data
in the logical logs and undoing the changes....

Now suppose you restore you DB using the level 0 archive..... and you are
rolling through the logical logs...... Where is the data to undo that
transaction on the page that had already been written, with uncommitted
data on it when the archive started? Its not in the DB those rows were
part of the archive. Its undo is only in the logical logs the ones that
were written when the update/insert/delete on the row was done. What
should the DB do if it does not have that information?

If you think about this a while it should become clear. Just remember that
a transaction can span many logical logs or few. A transaction can be
larger then the entire buffer pool ( although that would not be ideal ) a
transaction can span many hours even many days..... ( although this too
would be very bad practice and design )

Just work through the issue as if you were writing the engine.

From: "MARK JALKIEWICZ" <mark.jalkiewicz@verizon.net>
To: ids@iiug.org
Date: 01/20/2012 01:40 PM
Subject: Re: Restore + Logical log - caution [26002]
Sent by: ids-bounces@iiug.org

I read the APAR and I am left wondering what's the purpose of putting the
logical logs that encompass the open trx on the archive tape to begin
with ?

Is it requiring just one log prior the archive checkpoint or all that have
an
open transaction ?

Mark

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