Re: Insert performance - Mailing list pgsql-performance

From Andreas Kostyrka
Subject Re: Insert performance
Date
Msg-id 20070306122342.GO22981@andi-lap.la.revver.com
Whole thread Raw
In response to Re: Insert performance  (Richard Huxton <dev@archonet.com>)
Responses Re: Insert performance  (Richard Huxton <dev@archonet.com>)
Re: Insert performance  ("hatman" <joel.winteregg@gmail.com>)
List pgsql-performance
* Richard Huxton <dev@archonet.com> [070306 12:22]:
> >>2. You can do a COPY from libpq - is it really not possible?
> >>
> >Not really but i have been testing it and inserts are flying (about
> >100000 inserts/sec) !!
>
> What's the problem with the COPY? Could you COPY into one table then insert from that to your target table?
Well, there are some issues. First your client needs to support it.
E.g. psycopg2 supports only some specific CSV formatting in it's
methods. (plus I had sometimes random psycopg2 crashes, but guarding against
these is cheap compared to the speedup from COPY versus INSERT)
Plus you need to be sure that your data will apply cleanly (which in
my app was not the case), or you need to code a fallback that
localizes the row that doesn't work.

And the worst thing is, that it ignores RULES on the tables, which
sucks if you use them ;) (e.g. table partitioning).

Andreas

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