Horton

Re: PG 14 release notes, first draft

Peter Geoghegan <pg@bowt.ie>

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From: Peter Geoghegan <pg@bowt.ie>
To: Bruce Momjian <bruce@momjian.us>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>, Justin Pryzby <pryzby@telsasoft.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2021-05-22T22:35:13Z
Lists: pgsql-hackers 
On Thu, May 20, 2021 at 4:54 PM Bruce Momjian <bruce@momjian.us> wrote:
> I think our text "This new default better reflects current hardware
> capabilities." is detailed enough.  People can dig into the item to see
> what it does and how it adjusts costs.

Fair enough.

I noticed something about the same item that needs to be fixed,
though. The vacuum_cost_page_miss GUC does not directly represent any
kind of time-based delay, but the current wording says that it uses
millisecond units. In fact the vacuum_cost_page_miss GUC is based on
abstract cost units, apportioned from vacuum_cost_limit. I suggested
that the wording talk about relative cost differences in part because
that's just how the GUC works, in general.

-- 
Peter Geoghegan

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