Re: Performance issues with compaq server

On Wed, 8 May 2002, Martijn van Oosterhout wrote:

> On Tue, May 07, 2002 at 06:40:32PM -0400, Samuel J. Sutjiono wrote:
>
> > I tried to load data using insert statement to our new database server
> > (Compaq DL580, DL590, DL380 using SCSI driver) but it was very very slow.
> > The database runs on Red Hat Linux 7.2 and PostgreSQL version 7.1.3
> >
> > Does anybody know any idea to what cause this problem ? or things that I
> > need to look or check (in the config. file)
>
> Put them in a trasaction (begin/commit). Without that, each insert becomes
> it's own transaction which is rather expensive. Postgresql 7.2 improves this
> a bit but the transaction will help anyway.

ACK. On a given hardware I get about 150 inserts per second. Using a
begin/end transaction for a group of 100 inserts speeds it up to about
450 inserts per second.

But beware: if one insert fails (duplicate key, faulty data) then you
have to re-insert the remaining rows as single transactions, else all
rows of the previous transaction are discarded.

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