On Wed, 1 Oct 2003, Jingren Zhou wrote:
> Hi,
>
> >From the document, it seems that PREPARE/EXECUTE works only in the same
> session. I am wondering whether postgres can prepare a query (save the plan)
> for difference backends.
>
> I am working on a project which requires executing "psql -c 'query'" in
> command line multiple times. Since the performance is critical, it would be
> nice to prepare the same query first to avoid being parsed/optimized each
> time. But psql opens a new backend each time, it looks like that
> PREPARE/EXECUTE doesn't work. Is there any workaround?
Your real overhead here isn't from having to prepare the query each time,
it's from having to start psql and open a new connection each time.
Perhaps you need to rethink your design and go with something that will
maintain a persistent connection.
Kris Jurka
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
