Re: pg_clog not getting cleared

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От Scott Whitney
Тема Re: pg_clog not getting cleared
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Msg-id 21700506.3248.1293052359046.JavaMail.root@zimbra.int.journyx.com
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Ответ на pg_clog not getting cleared  (Scott Whitney <scott@journyx.com>)
Ответы Re: pg_clog not getting cleared  (Tom Lane <tgl@sss.pgh.pa.us>)
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I'm certain it was -f, not -F, since it's still in the script I use, albeit commented out.

I understand the purpose of the clogs, but I would think that the transactions would have been frozen on all dbs (I've got about 300 in my cluster) by now. My logs go back to July 13th which, I think, is when the server was last restarted.

I'll try the -F on Sat and see if that resolves the issue. I'll also have logs available at that time, assuming all goes well.

Thanks for the advice.


Scott Whitney <scott@journyx.com> wrote:
 
> Each Saturday, I run: vacuumdb -a -v. I have autovac on all the
> time.
>
> However, my pg_clog directory lists clog files going back to
> July.
>
> This is pg 8.4.4 on Linux (CentOS 5.5).
>
> I know this isn't a whole lot of information at this time. What
> more would be useful in finding out what's failing and where?
 
Nothing is failing -- clog is needed to track what has committed
until transactions are "frozen".
 
> I seem to recall that doing vacuumdb -f -a -v resolved it
 
Are you sure that wasn't -F rather than -f ?  The uppercase switch
freezes tuples, which would allow clog to be cleaned up.  This
shouldn't normally be needed, unless you have some other reason to
need aggressive freezing.
 
-Kevin

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