Re: BUG #5675: out of memory at request size 32Mb

Am 24.09.10 14:54, schrieb Robert Haas:
> On Fri, Sep 24, 2010 at 8:42 AM, Andreas Pflug
> <pgadmin@pse-consulting.de>  wrote:
>> The following bug has been logged online:
>>
>> Bug reference:      5675
>> Logged by:          Andreas Pflug
>> Email address:      pgadmin@pse-consulting.de
>> PostgreSQL version: 8.4.4
>> Operating system:   Linux 2.6.26 i686
>> Description:        out of memory at request size 32Mb
>> Details:
>>
>> A slony 2.0 cluster running for a year, no config changes lately. Slony has
>> to replicate a table with a bytea column; maximum so far was a little over
>> 32MB.
>>
>> Lately, the slave's slon process fails to replicate. The server reports "out
>> of memory", "Failed on request of size 33554432.". The slon log shows an
>> insert was the failing statement, the server log spits out its memory
>> contexts but not the failing statement.
>>
>> One log line that catched my attention was
>> MessageContext: 485902696 total in 6 blocks; 32160 free (16 chunks);
>> 485870536 used
>> which is well beyond the configured memory limits (280MB shared_buffers,
>> temp 32MB, workmem 64MB)
> Are you sure you meant to report this here?  Seems likely to be a
> Slony issue, although of course I'm not sure of that.
>
It's the postgres server that reports the oom situation on the insert query.

On further invesigation, the slon process (running on the same machine)
consumed all memory on the 144MB-Insert (for a 29MB column) making pgsql
bail out.

Regards,
Andreas