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

Yes. I have made suggestions on connection pooling as well. Currently it is
being done from Application side.

On Sat, Apr 3, 2021 at 11:12 PM Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
wrote:

>
>
> so 3. 4. 2021 v 19:37 odesílatel aditya desai <admad123(at)gmail(dot)com> napsal:
>
>> Hi Justin/Bruce/Pavel,
>> Thanks for your inputs. After setting force_parallel_mode=off Execution
>> time of same query was reduced to 1ms from 200 ms. Worked like a charm. We
>> also increased work_mem to 80=MB. Thanks
>>
>
> super.
>
> The too big max_connection can cause a lot of problems. You should install
> and use pgbouncer or pgpool II.
>
>
> https://scalegrid.io/blog/postgresql-connection-pooling-part-4-pgbouncer-vs-pgpool/
>
> Regards
>
> Pavel
>
>
>
>
>> again.
>>
>> Regards,
>> Aditya.
>>
>> On Sat, Apr 3, 2021 at 9:14 PM aditya desai <admad123(at)gmail(dot)com> wrote:
>>
>>> Thanks Justin. Will review all parameters and get back to you.
>>>
>>> On Sat, Apr 3, 2021 at 9:11 PM Justin Pryzby <pryzby(at)telsasoft(dot)com>
>>> 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.
>>>>
>>>> --
>>>> Justin
>>>>
>>>