Re: Non-deterministic buffer counts reported in execution with EXPLAIN ANALYZE BUFFERS

Tomas Vondra <tomas@vondra.me> writes:
> On 2/5/26 01:15, David Rowley wrote:
>> I imagined if it's just for machines running tests then you could just
>> load everything. If it was coded in such a way that a tuple fetched by
>> doing a Seq Scan on the catalogue table was what went into the cache,
>> rather than the Seq Scan drives the normal cache lookup code,
>> resulting in a subsequent Index Scan on the catalogue's index, then it
>> could be done with fairly low overhead. I imagine in the order of
>> <10ms from fresh initdb. That doesn't seem excessively long for
>> machines running tests in the background.

> So we'd just go through all the caches relcaches/catcaches/... and load
> all the stuff that's in pg_catalog? I guess that could work,

... until there's a cache flush event.  This whole discussion seems
to me to be based on a misconception.

            regards, tom lane