Thomas F.O'Connell wrote:

As a result, I was intending to inflate the value of effective_cache_size to closer to the amount of unused RAM on some of the machines I admin (once I've verified that they all have a unified buffer cache). Is that correct?

Effective cache size is IMHO a "bogus" parameter on postgresql.conf, this because:

1) That parameter is not intended to instruct postgres to use that ram but
   is only an hint to the engine on what the "DBA" *believe* the OS cache
   memory for postgres
2) This parameter change only the cost evaluation of plans ( and not soo
   much )

so don't hope to double this parameter and push postgres to use more RAM.

Gaetano Mendola

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