Bruce Momjian wrote:
> Well, let's walk through this. Let's suppose you have three updates
> that stay on the same page and don't update any indexed columns --- that
> would produce a HOT chain of four tuples. If you then do an update that
> changes an indexed column, prior to this patch, you get a normal update,
> and more HOT updates can be added to this. With WARM, we can join those
> chains
With WARM, what happens is that the first three updates are HOT updates
just like currently, and the fourth one is a WARM update.
> and potentially trim the first HOT chain as those tuples become
> invisible.
That can already happen even without WARM, no?
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