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Re: increasing the default WAL segment size

Peter Eisentraut <peter.eisentraut@2ndquadrant.com>

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From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
To: Robert Haas <robertmhaas@gmail.com>, Andres Freund <andres@anarazel.de>
Cc: "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2016-09-21T14:50:13Z
Lists: pgsql-hackers 
On 9/21/16 8:12 AM, Robert Haas wrote:
>> Oh, I'm on board with increasing the default size a bit. A different
>> > default size isn't a non-default compile time option anymore though, and
>> > I don't think 1GB is a reasonable default.
> But that's not the question.  What Peter said was: "maybe we should at
> least *allow* some larger sizes, for testing out".  I see very little
> merit in restricting the values that people can set via configure.
> That just makes life difficult.  If a user picks a setting that
> doesn't perform well, oops.

Right.  If we think that a larger size can have some performance benefit
and we think that 64MB might be a good new default (as was the initial
suggestion), then we should surely allow at least say 128 and 256 to be
tried out.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Make WAL segment size configurable at initdb time.

  2. Perform only one ReadControlFile() during startup.

  3. Introduce BYTES unit for GUCs.

  4. Remove useless duplicate inclusions of system header files.

  5. Refactor other replication commands to use DestRemoteSimple.

  6. Add a SHOW command to the replication command language.

  7. Add a new DestReceiver for printing tuples without catalog access.

  8. Support fls().

  9. Extend yesterday's patch making BLCKSZ and RELSEG_SIZE configurable to also

  10. Commit the reasonably uncontroversial parts of J.R. Nield's PITR patch, to

  11. XLOG (also known as WAL -:)) Bootstrap/Startup/Shutdown.

  12. Transaction log manager core code.