From: | Michael Milligan <milli(at)acmeps(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: PG 8.3.3 - ERROR: lock AccessShareLock on object 16385/16467/0 is already held |
Date: | 2008-08-29 20:57:55 |
Message-ID: | 48B862D3.5070000@acmeps.com |
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Thread: | |
Lists: | pgsql-bugs |
Tom Lane wrote:
> Michael Milligan <milli(at)acmeps(dot)com> writes:
>> Uh oh. This is a first (for me). I got this error on a transaction, it
>> did not crash the server but did abort the transaction (of course).
>
>> ERROR: lock AccessShareLock on object 16385/16467/0 is already held
>
> Huh, that shouldn't happen. What object is that? The 16385 should be
> a database OID, and the 16467 is most likely a table's OID within that
> database.
>
>> What was I doing? A large transaction where I was pushing about 20
>> million rows into two tables using prepared transactions. I have been
>> doing this for some time (over a year) on 8.2.6 without any problems.
>
>> I may be able to reproduce, but the transaction takes a long time to
>> complete... about a day. I'm running it again now.
>
> I wonder if it's possible that you overflowed nLocks in the local lock
> table. There are a lot of other things that likely would break first,
> though, so that doesn't seem very probable.
>
> Is this transaction longer than any comparable one you ever did before?
For 8.3.3, yes. This is only the second such large transaction I've
done on 8.3.3, the first one I did was around 6.7 million rows and it
worked.
And a correction, the transaction that caused this error was inserting
13.5 million rows and failed near the end.
Regards,
Mike
--
Michael Milligan -> milli(at)acmeps(dot)com
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