Hi, On Thu, Dec 19, 2024 at 06:12:04AM +0000, Bertrand Drouvot wrote: > I think I'll start a dedicated thread to discuss the > stats_fetch_consistency/'snapshot' > point (will be easier to follow than resuming the discussion in this thread).
I gave more thoughts on it and did some research in the mailing list. I've read those comments, from [1]: " We had a lot of discussion around what consistency model we want, and Tom was adamant that there needs to be a mode that behaves like the current consistency model (which is what snapshot behaves like, with very minor differences) " and from [2]: " One thing we definitely need to add documentation for is the stats_fetch_consistency GUC. I think we should change its default to 'cache', because that still gives the ability to "self-join", without the cost of the current method. " So now, I think that it is not a good idea for the per backend stats to behave differently than the other stats kinds. I think we should get rid of the "snapshot" for all of them or for none of them. Reading the above comments, it looks like it has already been discussed and that the outcome is to keep it for all of them. Regards, [1]: https://www.postgresql.org/message-id/20220404210610.6dgbwzpbiveyl5y3%40alap3.anarazel.de [2]: https://www.postgresql.org/message-id/20220329072651.imjqtzxwk6xycojv%40alap3.anarazel.de -- Bertrand Drouvot PostgreSQL Contributors Team RDS Open Source Databases Amazon Web Services: https://aws.amazon.com
