Memory
Postgres FM
The Importance of Cash in Postgres
Postgres never reads files from disk from file system it always goes through page cache. The rule of thunder right now is 25% I remember when we started to have more than a couple of gigabytes of memory on most machines there was a debate like at some point the rule was 25 if it does exceed like 8 gigabytes but now it's already it's okay to allocate 100 200 gigabytes and it's normal.
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