Bruce Momjian <br...@momjian.us> writes: > On Tue, May 12, 2020 at 03:38:16PM -0700, David G. Johnston wrote: >> The proposal is to document in versions 9.4 to 11 that the recommended value >> for the setting is 2ms while for reasons of continuity the default in these >> versions is 20ms. >> I don't really see any harm in it. Its not like the choice to reduce the >> value >> was made because of new features introduced in 12 - it was a re-evaluation >> of a >> 15 year old default.
> Well, we really need to have some general discussion about whether > changing defaults in major releases should trigger a mention to change > the defaults in back branches. This is something that would have to be > discussed on the hackers list. It's not immediately obvious that the new default value established in version N is appropriate for version N-minus-several. Certainly, whatever testing was done to justify the new default wouldn't have been done on old versions; and there might have been relevant changes. In short: nope, I'm not on board with blindly back-patching such recommendations. regards, tom lane