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: Bruce Momjian <bruce@momjian.us>
Cc: Dilip Kumar <dilipbalaut@gmail.com>, Alvaro Herrera <alvherre@alvh.no-ip.org>, Andrew Dunstan <andrew@dunslane.net>, Heikki Linnakangas <hlinnaka@iki.fi>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-02-14T20:05:18Z
Lists: pgsql-hackers 
On Mon, Feb 14, 2022 at 1:58 PM Bruce Momjian <bruce@momjian.us> wrote:
> > I think we have consensus on STRATEGY. I'm not sure if we have
> > consensus on what the option values should be. If we had an option to
> > use fs-based cloning, that would also need to issue a checkpoint,
> > which makes me think that CHECKPOINT is not the best name.
>
> I think if we want LOG, it has tob e WAL_LOG instead of just LOG.  Was
> there discussion that the user _has_ to specify and option instead of
> using a default?  That doesn't seem good.

I agree. I think we can set a default, which can be either whatever we
think will be best on average, or maybe it can be conditional based on
the database size or something.

-- 
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.