Re: SELECT Query taking 200 ms on PostgreSQL compared to 4 ms on Oracle after migration.

On Sat, Apr 3, 2021 at 10:41:14AM -0500, Justin Pryzby wrote:
> On Sat, Apr 03, 2021 at 11:39:19AM -0400, Tom Lane wrote:
> > Bruce Momjian <bruce(at)momjian(dot)us> writes:
> > > On Sat, Apr 3, 2021 at 08:38:18PM +0530, aditya desai wrote:
> > >> Yes, force_parallel_mode is on. Should we set it off?
> >
> > > Yes. I bet someone set it without reading our docs:
> >
> > > https://www.postgresql.org/docs/13/runtime-config-query.html#RUNTIME-CONFIG-QUERY-OTHER
> >
> > > --> Allows the use of parallel queries for testing purposes even in cases
> > > --> where no performance benefit is expected.
> >
> > > We might need to clarify this sentence to be clearer it is _only_ for
> > > testing.
> >
> > I wonder why it is listed under planner options at all, and not under
> > developer options.
>
> Because it's there to help DBAs catch errors in functions incorrectly marked as
> parallel safe.

Uh, isn't that developer/debugging?

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

If only the physical world exists, free will is an illusion.