Horton

Re: EXPLAIN IndexOnlyScan shows disabled when enable_indexonlyscan=on

David Rowley <dgrowleyml@gmail.com>

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From: David Rowley <dgrowleyml@gmail.com>
To: "David G. Johnston" <david.g.johnston@gmail.com>
Cc: Melanie Plageman <melanieplageman@gmail.com>, Pg Hackers <pgsql-hackers@postgresql.org>, Robert Haas <robertmhaas@gmail.com>
Date: 2024-10-22T02:20:22Z
Lists: pgsql-hackers 
On Tue, 22 Oct 2024 at 14:46, David G. Johnston
<david.g.johnston@gmail.com> wrote:
> 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.

Yeah, I agree. The documentation could better reflect the current behaviour.

Do you want to submit that in patch form?

David

Commits

  1. Doc: clarify enable_indexscan=off also disabled Index Only Scans