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Re: increasing the default WAL segment size

David Steele <david@pgmasters.net>

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From: David Steele <david@pgmasters.net>
To: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, Stephen Frost <sfrost@snowman.net>, Robert Haas <robertmhaas@gmail.com>
Cc: Beena Emerson <memissemerson@gmail.com>, tushar <tushar.ahuja@enterprisedb.com>, Prabhat Sahu <prabhat.sahu@enterprisedb.com>, Ashutosh Sharma <ashu.coek88@gmail.com>, Jim Nasby <Jim.Nasby@bluetreble.com>, Kuntal Ghosh <kuntalghosh.2007@gmail.com>, Andres Freund <andres@anarazel.de>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2017-03-22T21:33:37Z
Lists: pgsql-hackers 
On 3/22/17 3:39 PM, Peter Eisentraut wrote:
> On 3/22/17 15:37, Peter Eisentraut wrote:
>> If changing WAL sizes catches on, I do think we should keep thinking
>> about a new format for a future release,
>
> I think that means that I'm skeptical about changing the default size
> right now.

I think if we don't change the default size it's very unlikely I would 
use alternate WAL segment sizes or recommend that anyone else does, at 
least in v10.

I simply don't think it would get the level of testing required to be 
production worthy and I doubt that most tool writers would be quick to 
add support for a feature that very few people (if any) use.

-- 
-David
david@pgmasters.net

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.