Horton

Re: [Proposal] Fully WAL logged CREATE DATABASE - No Checkpoints

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Ashutosh Sharma <ashu.coek88@gmail.com>
Cc: Dilip Kumar <dilipbalaut@gmail.com>, Neha Sharma <neha.sharma@enterprisedb.com>, Bruce Momjian <bruce@momjian.us>, Greg Nancarrow <gregn4422@gmail.com>, Andres Freund <andres@anarazel.de>, Heikki Linnakangas <hlinnaka@iki.fi>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-02-08T17:11:49Z
Lists: pgsql-hackers 
On Wed, Dec 22, 2021 at 9:32 AM Ashutosh Sharma <ashu.coek88@gmail.com> wrote:
> I couldn't find the mdpostchkpt() function. Are you talking about
> SyncPostCheckpoint() ? Anyway, as you have rightly said, we need to
> unlink all the files available inside the dst_tablespaceoid/dst_dboid/
> directory by scanning the pendingUnlinks list. And finally we don't
> want the next checkpoint to unlink this file again and PANIC so for
> that we have to update the entry for this unlinked rel file in the
> hash table i.e. cancel the sync request for it.

Until commit 3eb77eba5a51780d5cf52cd66a9844cd4d26feb0 in April 2019,
there was an mdpostckpt function, which is probably what was meant
here.

-- 
Robert Haas
EDB: http://www.enterprisedb.com

Commits

  1. When using the WAL-logged CREATE DATABASE strategy, bulk extend.

  2. Avoid using a fake relcache entry to own an SmgrRelation.

  3. Fix data-corruption hazard in WAL-logged CREATE DATABASE.

  4. initdb: When running CREATE DATABASE, use STRATEGY = WAL_COPY.

  5. Simplify a needlessly-complicated regular expression.

  6. In 020_createdb.pl, change order of command-line arguments.

  7. Add new block-by-block strategy for CREATE DATABASE.

  8. Fix replay of create database records on standby

  9. Refactor code for reading and writing relation map files.

  10. Replace RelationOpenSmgr() with RelationGetSmgr().

  11. Refactor the fsync queue for wider use.