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Re: bulk inserts

From: Martin Gainty <mgainty(at)hotmail(dot)com>
To: Sam Mason <sam(at)samason(dot)me(dot)uk>, "pgsql-general(at)postgresql(dot)org"<pgsql-general(at)postgresql(dot)org>
Subject: Re: bulk inserts
Date: 2009-09-29 00:33:45
Message-ID: BLU142-W10E0636EFAAC7CBEAC8B9EAED50@phx.gbl (view raw or flat)
Thread:
Lists: pgsql-general
INSERTS/UPDATES are historically slow especially with autocommit is on (implied autocommit on)
the Database writer actually stops any processing and applies that one record to the database
Most bulk operations such as import/export and copy are well worth their weight as they apply en-masse
before any commit ..remember the DB actually stops flushes its buffers to Disk
and then resumes..the only solution here is to disable autocommit but be wary you may have 100's of statements waiting to be commited and then someone does a quit on your session..all your work is lost

good call on copy
http://www.postgresql.org/docs/8.1/interactive/populate.html

cheers,
Martin Gainty 
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> Date: Mon, 28 Sep 2009 21:52:36 +0100
> From: sam(at)samason(dot)me(dot)uk
> To: pgsql-general(at)postgresql(dot)org
> Subject: Re: [GENERAL] bulk inserts
> 
> On Mon, Sep 28, 2009 at 10:38:05AM -0500, Dave Huber wrote:
> > Using COPY is out of the question as the file is not formatted for
> > that and since other operations need to occur, the file needs to be
> > read sequentially anyway.
> 
> Just to expand on what Martin said; if you can generate a set of EXECUTE
> commands, you can certainly generate a COPY command to insert the same
> data.  The advantage is a large drop in parse time for inserting larger
> numbers of rows.  As you're saying you want to insert 500 rows, I'd
> suggest at least trying to get COPY working.
> 
> -- 
>   Sam  http://samason.me.uk/
> 
> -- 
> Sent via pgsql-general mailing list (pgsql-general(at)postgresql(dot)org)
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