Query response time

Hi all,

I am using PostgresSQL 7.4 and having some serious performance issues.
Trawling through the archives and previous posts the only visible advice
I could see was either by running vacuum or setting the fsynch flag to
false.

I am using tables that only contain approx 2GB of data. However
performing a number of simple conditional select statements takes a
great deal of time. Putting limits on the data obviously reduces the
time, but there is still a delay. (Note: on one particular query I set
the limit to 538 and the query returns in under 2mins if the limit
becomes 539 the query loops indefinitely!)
>From previous experience I know these delays are longer than both
Informix and MySql. In some instances it takes so long I end up having
to kill the query.

The install was performed by yum onto a RAID server using Centos. I am
sure there is something fundamentally wrong for I can't believe that
postgres would have the reputation it has based on the statistics I'm
getting. Does anyone have any advice?

The data I am using was imported from an Informix system as part of a
migration strategy.
I know this is long shot but I hope someone can shed some light.

Regards,

Jonathan

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