Re: Performance Issue after upgrade from 9 to 11

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От Perumal Raj
Тема Re: Performance Issue after upgrade from 9 to 11
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Msg-id CALvqh4o-eyy4tO-Ed=qaxw_Vo6o6xESNRt-dEKW57JMdUMnpMw@mail.gmail.com
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Ответ на Re: Performance Issue after upgrade from 9 to 11  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Performance Issue after upgrade from 9 to 11
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Hi Tom /Adrian,

Issue is not specific to a table or particular Query. Also there is no change in DB parameter after upgrade.

That the only way i can make it most of the the query to run as like before upgrade.

Note:
Some web reference says , Engine will take some time to adjust until it runs autovacuum .




On Wed, Jan 29, 2020 at 10:22 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
Perumal Raj <perucinci@gmail.com> writes:
> We have recently upgraded postgres from 9.2 to 11.6 and started seeing
> performance issue immediately and  able to fix the performance issue after
> disabling parameter: enable_seqscan.
> Question :
> Should i keep the above parameter always disabled ? If not why the behavior
> changed in Higher version ?

This is unanswerable with the amount of information you've given.
Yes, turning off enable_seqscan is a bad idea in general, but why
you got a worse plan without that requires details.

https://wiki.postgresql.org/wiki/Slow_Query_Questions

                        regards, tom lane

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