Re: select count() out of memory - Mailing list pgsql-general

From Tom Lane
Subject Re: select count() out of memory
Date
Msg-id 15321.1193322640@sss.pgh.pa.us
Whole thread Raw
In response to Re: select count() out of memory  (Alvaro Herrera <alvherre@commandprompt.com>)
Responses Re: select count() out of memory  (tfinneid@student.matnat.uio.no)
Re: select count() out of memory  ("Scott Marlowe" <scott.marlowe@gmail.com>)
List pgsql-general
Alvaro Herrera <alvherre@commandprompt.com> writes:
> tfinneid@student.matnat.uio.no wrote:
>> I did a test previously, where I created 1 million partitions (without
>> data) and I checked the limits of pg, so I think it should be ok.

> Clearly it's not.

You couldn't have tested it too much --- even planning a query over so
many tables would take forever, and actually executing it would surely
have run the system out of locktable space before it even started
scanning.

The partitioning facility is designed for partition counts in the tens,
or maybe hundreds at the most.

            regards, tom lane

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