Horton

Re: First draft of the PG 15 release notes

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Euler Taveira <euler@eulerto.com>
Cc: Ajin Cherian <itsajin@gmail.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2022-05-12T14:22:17Z
Lists: pgsql-hackers 
On Thu, May 12, 2022 at 11:12:54AM -0300, Euler Taveira wrote:
OB> On Thu, May 12, 2022, at 11:03 AM, Bruce Momjian wrote:
> 
>     I looked at that but thought that everyone would already assume we
>     skipped replication of empty transactions, and I didn't see much impact
>     for the user, so I didn't include it.
> 
> It certainly has an impact on heavy workloads that replicate tables with few
> modifications. It receives a high traffic of 'begin' and 'commit' messages that
> the previous Postgres versions have to handle (discard). I would classify it as
> a performance improvement for logical replication. Don't have a strong opinion
> if it should be mentioned or not.

Oh, so your point is that a transaction that only has SELECT would
previously send an empty transaction?  I thought this was only for apps
that create literal empty transactions, which seem rare.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  Indecision is a decision.  Inaction is an action.  Mark Batterson

Commits

  1. Doc: last minute adjustment to the release notes

  2. Doc: more tweaking of v15 release notes.

  3. Doc: further adjust notes about pg_upgrade_output.d.

  4. Doc: add list of major features to the v15 release notes.

  5. relnotes: update item about public schema permission change

  6. relnotes: update ordered partition scan item

  7. relnotes: add Heikki to UTF8 item

  8. relnotes: improve UTF8 text item in relation to ASCII

  9. relnotes: add null logical replication item

  10. relnotes: adjust several logical replication items and FK text

  11. relnotes: mention non-exclusive backup mode was deprecated

  12. relnotes: add author to in-memory sorts item

  13. relnotes: update for non-exclusive backup mode removal

  14. relnote: improve sorting entries

  15. relnotes: adjustments from Álvaro Herrera

  16. relnotes: update foreign key partition and add sort items

  17. relnotes: more adjustments

  18. relnotes: logical replication permissions checked by subscrib.

  19. relnotes: adjustments

  20. relnotes: remove sequence replication and update 'postgres -C'

  21. relnote: extensive updates

  22. relnotes: "training" -> "trailing"

  23. Standardize references to Zstandard as <productname>

  24. pgstat: Update docs to match the shared memory stats reality.

  25. Raise a WARNING for missing publications.

  26. Skip empty transactions for logical replication.

  27. Optionally disable subscriptions on error.

  28. Allow root-owned SSL private keys in libpq, not only the backend.

  29. Use COPY FREEZE in pgbench for faster benchmark table population.