Horton

Re: PG 14 release notes, first draft

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Peter Geoghegan <pg@bowt.ie>
Cc: Fujii Masao <masao.fujii@oss.nttdata.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2021-05-17T20:32:07Z
Lists: pgsql-hackers 
On Mon, May 17, 2021 at 12:45:44PM -0700, Peter Geoghegan wrote:
> I propose that the B-Tree index item (bottom-up index deletion, "Allow
> btree index additions to remove expired index entries to prevent page
> splits") link back to the documentation for those that want to drill
> down:
> 
> https://www.postgresql.org/docs/14/btree-implementation.html#BTREE-DELETION
> 
> The same approach was used for the Postgres 13 B-Tree deduplication
> release note item (same page from the docs, even).
> 
> I understand that it's kind of hard to get the point of the feature
> across within the confines of the release notes, which have a very
> wide audience. I believe that the practical take-away for more
> experienced users should be something like "significantly ameliorates
> write-amplification problems in indexes with non-HOT updates". But
> that's quite a mouthful. Having a hyperlink to the docs seems like a
> sensible compromise. I really just want experienced users to be able
> to make the connection between this feature and well-publicized
> problems with Postgres index bloat/VACUUM.

Yes, I am going to add links to everything, but haven't had time yet.

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

  If only the physical world exists, free will is an illusion.

Commits

  1. doc: add mention of +4GB windows file handling in PG14 relnotes

  2. doc: PG 14 relnotes fixes

  3. doc: PG 14 relnote updates

  4. doc: PG 14 relnotes, adjust pg_{read|write}_all_data entry

  5. Update PG 14 relnotes for vacuum_cost_page_miss

  6. doc: update PG 14 release notes with recent feedback

  7. Update replication statistics after every stream/spill.

  8. Add information of total data processed to replication slot stats.

  9. Use NameData datatype for slotname in stats.

  10. Add back vacuum_cleanup_index_scale_factor parameter.

  11. Don't consider newly inserted tuples in nbtree VACUUM.

  12. pgbench: Improve time logic.

  13. Track total amounts of times spent writing and syncing WAL data to disk.

  14. Allow decoding at prepare time in ReorderBuffer.

  15. Extend the output plugin API to allow decoding of prepared xacts.

  16. Fix nbtree cleanup-only VACUUM stats inaccuracies.

  17. Execute invalidation messages for each XLOG_XACT_INVALIDATIONS message

  18. Fix our Windows stat() emulation to handle file sizes > 4GB.

  19. Trigger autovacuum based on number of INSERTs

  20. Speed up planning when partitions can be pruned at plan time.

  21. Remove support for password_encryption='off' / 'plain'.

  22. Increase work_mem and maintenance_work_mem defaults by 4x