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Re: increasing the default WAL segment size

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: Michael Paquier <michael.paquier@gmail.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Simon Riggs <simon@2ndquadrant.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2016-08-26T03:54:29Z
Lists: pgsql-hackers 
On Fri, Aug 26, 2016 at 9:04 AM, Michael Paquier
<michael.paquier@gmail.com> wrote:
> On Fri, Aug 26, 2016 at 12:25 PM, Amit Kapila <amit.kapila16@gmail.com> wrote:
>> If we change the default to 64MB, then I think it won't allow to use
>> old databases as-is because we store it in pg_control (I think one
>> will get below error [1] for old databases, if we just change default
>> and don't do anything else).  Do you have way to address it or you
>> think it is okay?
>
> Those would still be able to work with ./configure
> --with-wal-segsize=16, so that's not really an issue.
>

Right, but do we need suggest users to do so?  The question/point was
if we deliver server with default value as 64MB, then it won't allow
to start old database.



-- 
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com

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.