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Does your RDBMS's built-in caching not handle this pretty well? Just up the cache size, e.g. in PostgreSQL changing effective_cache_size https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Serv...

For reads, yes. It's fine on reading data. The problems are writes which always wait for disk consistency to return.

shared_buffers is the setting you're thinking of here.

effective_cache_size should be set to a reasonable value of course, but it does not affect the allocated cache size, it's just used by the query optimizer.

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