> Possibly stopping at the tablespace level might be more straightforward.
> To avoid messing up the pages in shared buffers we'd perhaps need
> something like several shared buffer pools - each with either its own
> blocksize or associated with a (set of) tablespace(s).
This is exactly how Oracle does it. You can specify the blocksize when
creating a tablespace.
For each blocksize a separate buffer cache ("shared buffers" in Postgres
terms) can be configured. So the cache is not maintained on tablespace level
but on blocksize level.
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