Tom Lane wrote:
> Recall also that "committed deleted" does not mean "safe to remove".
> There may still be live transactions that could see the tuple. The
> "committed deleted" bit just exists to allow subsequent visitors to the
> row to skip one of the more expensive steps in deciding whether they can
> see it or not.
>
> To determine that a row is removable requires additional tests above and
> beyond what backends normally do.
Aah - there is the first bullet hole in my multi-ctid-index-idea. Now
the question becomes how expensive these tests are (if a normal backend
can do them at all within reason)?
Jan
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