Tore Halset <[email protected]> writes:
> On Oct 15, 2012, at 2:27 AM, Tom Lane <[email protected]> wrote:
>> Tore Halset <[email protected]> writes:
>>> On this box I drop a 80GB database each night followed by a restore of a
>>> similar sized database. It is a restore of our production database to a
>>> development server. This box is running 9.2rc1 (sorry).
>>> du and df reported quite different numbers and lsof show that autovacuum is
>>> holding lots of deleted files. After killing the autovacuum daemon, some
>>> disk space was restored and the du and df numbers was more equal.
>> Hm. I've been able to reproduce some leakage of file descriptors in the
>> autovac launcher, but it required (a) fairly small shared_buffers and
>> (b) very heavy update activity on large tables. So I'm not sure that it
>> would explain the consistent leakage you seem to be seeing. Can you
>> tell us more about your usage pattern on the development server?
> A cron job dropdb one of the databases and createdb it and then pg_restore.
> Roughly 80GB dump.
So far, my guess is that this is fixed by commits a1f064fc2 + d7598aeea.
> Out production PostgreSQL running a 9.1 variant does not have this problem.
> It does not have the nightly dropdb/createdb/pg_restore, but otherwise
> similar usage patterins. It is also configured to use more memory.
9.1 has the same bug (and the same patches), but I think that the aspect
you're running into is specific to DROP DATABASE scenarios.
regards, tom lane
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