EXPLAIN IndexOnlyScan shows disabled when enable_indexonlyscan=on
| От | David G. Johnston |
|---|---|
| Тема | EXPLAIN IndexOnlyScan shows disabled when enable_indexonlyscan=on |
| Дата | |
| Msg-id | CAKFQuwYx0m2O3rM=CF1nj6xuqNMTe-NPNOsue7chyqS_EjhKng@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: EXPLAIN IndexOnlyScan shows disabled when enable_indexonlyscan=on (David Rowley <dgrowleyml@gmail.com>) |
| Ответы |
Re: EXPLAIN IndexOnlyScan shows disabled when enable_indexonlyscan=on
|
| Список | pgsql-hackers |
On Monday, October 21, 2024, David Rowley <dgrowleyml@gmail.com> wrote:
On Tue, 22 Oct 2024 at 13:45, Melanie Plageman
<melanieplageman@gmail.com> wrote:
> I was surprised today when I saw that with
> enable_indexscan=off
> enable_indexonlyscan=on
Robert did propose to change this behaviour while he was working on
the disabled_nodes changes. I did push back on the proposed change
[1]. If you feel strongly that what we have is wrong, then maybe it's
worth opening the discussion about that again.
We should probably at least improve the documentation in 19.17.1; this interaction is apparently not self-evident.
enable_indexscan
Enable or disable the planner’s use of both index-scan and index-only-scans plan types.
enabled_indexonlyscan
Set to off to disable index-only-scan plan type while leaving index-scan plan types enabled. This setting has no effect if enable_indexscan is set to off.
David J.
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