Re: Very poor read performance, query independent

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From: Charles Nadeau [mailto:charles.nadeau@xxxxxxxxx]
Sent: Tuesday, July 11, 2017 11:25 AM
To: Igor Neyman <ineyman@xxxxxxxxxxxxxx>
Cc: pgsql-performance@xxxxxxxxxxxxxx
Subject: Re: [PERFORM] Very poor read performance, query independent

 

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Igor,

 

The sum of effective_cache_size and shared_buffer will be higher than the physical memory I have. Is it OK?

Thanks!

 

Charles

 

Yes, that’s normal.

 

shared_buffers is the maximum that Postgres allowed to allocate, while effective_cache_size is just a number that optimizer takes into account when creating execution plan.

 

Igor

 


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