Re: pg_autovacuum crashes when query fails for temp tables

Yeah, I will, I just don't know when. I have been trying to get to this
and lots of other pg_autovacuum tasks, but my schedule has been quite
crazy as of late. Anyway, this should probably be a pretty simple patch,
so I can probably find some time to look at it soon.

Any idea on the 7.4.3 release timeline?

>
> I looked into this and I see a number of cases where pg_autovacuum calls
> send_query(), but doesn't test for a NULL return from the function.
>
> Matthew, would you look into this and submit a patch? Thanks.
>
> ---------------------------------------------------------------------------
>
> Jeff Boes wrote:
>> Recently I installed and started pg_autovacuum against my new Pg 7.4.1
>> installation. We use a fairly large number of temporary tables within an
>> application (that is, several copies of this application may be running,
>> and each creates and drops several temp tables as they cycle through
>> their workload). Here's what I think happened, based on the log
>> (pg_autovacuum's and the postmaster's):
>>
>> pg_autovacuum.log:
>> [2004-02-15 08:10:01 AM] Performing: ANALYZE "pg_temp_13"."tmp_targs"
>> [2004-02-15 08:10:01 AM] Can not refresh statistics information from the
>> database nexcerpt.
>> [2004-02-15 08:10:01 AM] The error is [ERROR: relation
>> "pg_temp_13.tmp_targs" does not exist
>>
>> postmaster.log:
>> 2004-02-15 08:10:01 [31563] ERROR: relation "pg_temp_13.tmp_targs" does
>> not exist
>> 2004-02-15 08:10:01 [31563] LOG: unexpected EOF on client connection
>>
>>
>> It appears that pg_autovacuum collected the name of a temp table, and
>> later tried to analyze it. The table was gone by then, and this caused
>> the daemon to exit. As this happened on a Sunday morning, my weekend
>> experiment to see how pg_autovacuum would maintain our test database was
>> rather spoiled ... 8-(
>>
>> --
>> Jeff Boes vox 269.226.9550 ext 24
>> Database Engineer fax 269.349.9076
>> Nexcerpt, Inc. http://www.nexcerpt.com
>> ...Nexcerpt... Extend your Expertise
>>
>>
>> ---------------------------(end of broadcast)---------------------------
>> TIP 8: explain analyze is your friend
>>
>
> --
> Bruce Momjian | http://candle.pha.pa.us
> pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
> + If your life is a hard drive, | 13 Roberts Road
> + Christ can be your backup. | Newtown Square, Pennsylvania
> 19073
>
>