Invalid WAL segment size. Allowed values are 1,2,4,8,16,32,64

On Fri, Jun 9, 2017 at 10:55 PM, Cocco Gianfranco
<Gianfranco.Cocco@eng.it> wrote:

Is there a way to fix “wal_segsize” to about 1 Gb in 9.2. version, and “rebuild” postgreSQL server?

As long as you are able to compile your own version of Postgres and
your distribution does not allow that, there is nothing preventing you
to do so.

The goal is to drastically reduce the number of WALs.
Upgrading to 9.5, is the only way to fix this issue?

Note that a server initialized with a segment size of X won't work
with a binary compiled with a size of Y. But you can always take a
logical dump of the server before the upgrade, and reload it in the
version of the server with a larger segment size. The cost here is
more downtime.
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Michael

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On Fri, Jun 9, 2017 at 3:43 PM, Michael Paquier <michael.paquier@gmail.com>
wrote:

On Fri, Jun 9, 2017 at 10:55 PM, Cocco Gianfranco
<Gianfranco.Cocco@eng.it> wrote:

Is there a way to fix “wal_segsize” to about 1 Gb in 9.2. version, and

“rebuild” postgreSQL server?

As long as you are able to compile your own version of Postgres and
your distribution does not allow that, there is nothing preventing you
to do so.

But there is something preventing it. wal_segsize cannot exceed 64MB in
9.2. v10 will be the first version which will allow sizes above 64MB.

Cheers,

Jeff

On Tue, Jun 13, 2017 at 2:27 AM, Jeff Janes <jeff.janes@gmail.com> wrote:

But there is something preventing it. wal_segsize cannot exceed 64MB in
9.2. v10 will be the first version which will allow sizes above 64MB.

Yes, indeed. I have misread --with-segsize and --with-wal-segsize in
the docs. Sorry for the confusion.
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Michael

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Thank you.

If I understand it well, we can build a new postgreSQL server, by setting this value into "configure" file?

--with-wal-segsize=SEGSIZE becomes --with-wal-segsize=1024 ??

_______________________________

Gianfranco Cocco

Gruppo DBA Torino

Managed Operations - Data Center Factory

gianfranco.cocco@eng.it

Engineering.MO S.p.A

Corso Mortara, 22 - 10149 Torino

Tel. 011 19449548 (SHORT CODE: 676548)

www.eng.it

___________________________

-----Messaggio originale-----
Da: Michael Paquier [mailto:michael.paquier@gmail.com]
Inviato: lunedì 12 giugno 2017 23:26
A: Jeff Janes <jeff.janes@gmail.com>
Cc: Cocco Gianfranco <Gianfranco.Cocco@eng.it>; pgsql-performance@postgresql.org; pgsql-bugs@postgresql.org; DBA <DBA@italiaonline.it>
Oggetto: Re: [BUGS] Invalid WAL segment size. Allowed values are 1,2,4,8,16,32,64

On Tue, Jun 13, 2017 at 2:27 AM, Jeff Janes <jeff.janes@gmail.com<mailto:jeff.janes@gmail.com>> wrote:

But there is something preventing it. wal_segsize cannot exceed 64MB

in 9.2. v10 will be the first version which will allow sizes above 64MB.

Yes, indeed. I have misread --with-segsize and --with-wal-segsize in the docs. Sorry for the confusion.

--

Michael

On Tue, Jun 13, 2017 at 6:10 PM, Cocco Gianfranco
<Gianfranco.Cocco@eng.it> wrote:

If I understand it well, we can build a new postgreSQL server, by setting
this value into "configure" file?

--with-wal-segsize=SEGSIZE becomes --with-wal-segsize=1024 ??

Yes, but as Jeff has pointed out upthread, this value can just go up
to 64 when using 9.5.
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Michael

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On Tue, Jun 13, 2017 at 10:39 PM, Cocco Gianfranco
<Gianfranco.Cocco@eng.it> wrote:

./configure --with-wal-segsize=1024

checking for WAL segment size... configure: error: Invalid WAL segment size.
Allowed values are 1,2,4,8,16,32,64.

Please, how can I do?

When trying to compile Postgres 9.6, the maximum value is 64. If you
want to allow 1GB of WAL segment size you will need to wait for 10, or
just use 64MB.
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Michael

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