Re: Lock-free compaction. Why not?

Robert Haas <robertmhaas@gmail.com> writes:
> On Thu, Jul 18, 2024 at 7:08 AM David Rowley <dgrowleyml@gmail.com> wrote:
>> I think the primary issue with the old way was index bloat wasn't
>> fixed. The release notes for 9.0 do claim the CLUSTER method "is
>> substantially faster in most cases", however, I imagine there are
>> plenty of cases where it wouldn't be. e.g, it's hard to imagine
>> rewriting the entire 1TB table and indexes is cheaper than moving 1
>> row out of place row.

> The other thing I remember besides index bloat is that it was
> crushingly slow.

Yeah.  The old way was great if there really were just a few tuples
needing to be moved ... but by the time you decide you need VACUUM
FULL rather than plain VACUUM, that's unlikely to be the case.  

            regards, tom lane