From: Stephen Frost <sfrost@snowman.net>
To: Emi Lu <emilu@encs.concordia.ca>
Cc: pgsql-performance@postgresql.org
Cc: david.g.johnston@gmail.com
Subject: Re: autocommit (true/false) for more than 1 million records
Date: Fri, 22 Aug 2014 17:21:15 -0400
Message-ID: <20140822212115.GB16422@tamriel.snowman.net> (raw)
In-Reply-To: <53F7B1E5.6030507@encs.concordia.ca>
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<20140822210018.GZ16422@tamriel.snowman.net>
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* Emi Lu (emilu@encs.concordia.ca) wrote:
> >*
> >>Trying to insert into one table with 1 million records through java
> >>JDBC into psql8.3. May I know (1) or (2) is better please?
> >>
> >>(1) set autocommit(true)
> >>(2) set autocommit(false)
> >> commit every n records (e.g., 100, 500, 1000, etc)
> >It depends on what you need.
> >
> >Data will be available to concurrent processes earlier with (1), while
> >(2) will go faster.
> No need to worry about the lock/loosing records because after data
> loading will do a check. For now, I'd like the fastest way. Would
> you suggest commit every 1000 or 3000 records?
The improvement drops off pretty quickly in my experience, but it
depends on the size of the records and other things.
Try it and see..? It's almost certainly going to depend on your
specific environment.
Thanks,
Stephen
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To: pgsql-performance@postgresql.org
Cc: sfrost@snowman.net, emilu@encs.concordia.ca, david.g.johnston@gmail.com
Subject: Re: autocommit (true/false) for more than 1 million records
In-Reply-To: <20140822212115.GB16422@tamriel.snowman.net>
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