Tom Lane-2 wrote
> Postgres would be completely broken if that were true, because
> modifications made to one copy would fail to propagate to other copies.
> I don't know where your data came from, but it can't be an accurate
> representation of the instantaneous state of the buffer cache.
>
> ... actually, after looking at your query, I wonder whether the issue
> is that you're failing to include database and tablespace in the
> grouping key. relfilenode isn't guaranteed unique across directories.
> The fork number can matter, too.
thank you I'll add those columns to my query
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