>
> On Oct 15, 2018, at 12:04 PM, Ghiurea, Isabella <Isabella.Ghiurea@nrc-cnrc.gc.ca> wrote:
>
> I am running PGSQL 10.4 on Cent OS Pg instance has ' effective_cache_size' parameter not enabled I would like to
learnwhat will the optimizer behavior be in this case ?
> ( default is set to 4GB , I was thinking PG 's optimizer will try to use all available OS RAM when trying to
estimatea query, is this the case)
That's merely a hint to the optimizer as to how much file data is likely to be cached by the OS--it doesn't directly
affectany PG allocations, rather it might influence PG's choice of steps to carry out a query, which of course could
indirectlychange the RAM that PG would use.
--
Scott Ribe
scott_ribe@elevated-dev.com
https://www.linkedin.com/in/scottribe/
