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Re: Performance Issue after upgrade from 9 to 11

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Perumal Raj <perucinci@xxxxxxxxx> 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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