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Re: pgbench enhancements

From: Tatsuo Ishii <ishii(at)sraoss(dot)co(dot)jp>
To: tgl(at)sss(dot)pgh(dot)pa(dot)us
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: pgbench enhancements
Date: 2006-07-26 22:42:41
Message-ID: 20060727.074241.73653242.t-ishii@sraoss.co.jp (view raw or flat)
Thread:
Lists: pgsql-hackers
> Tatsuo Ishii <ishii(at)sraoss(dot)co(dot)jp> writes:
> > BTW, running long benchmark using pgbench on BIG tables easily causes
> > an integer overflow error in following SQLs:
> 
> Right.
> 
> > I'm inclined to change abalance, tbalance and bbalance column to
> > BIGINT to avoid the error. Opinion?
> 
> No.  The problem is that the deltas are invariably positive, which is
> not realistic (at least *my* bank balance isn't uniformly increasing :-().
> I think the correct fix is just to tweak the range of the randomly
> distributed deltas to be plus and minus not always plus.

I have never thought about it. Seems nice idea. Thanks.

> If you change to bigint then post-change results won't be strictly
> comparable to pre-change results because of the difference in execution
> costs.

Yes, that was my concerning too.
--
Tatsuo Ishii
SRA OSS, Inc. Japan

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