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From: Jürgen Purtz <[email protected]>
To: Robert Haas <[email protected]>
Cc: Justin Pryzby <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: Corey Huinker <[email protected]>
Cc: Roger Harkavy <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Fabien COELHO <[email protected]>
Cc: Michael Paquier <[email protected]>
Subject: Re: Add A Glossary
Date: Tue, 24 Mar 2020 20:40:20 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CA+TgmoYT2NnUueP5_=Z48XwVpyzciBfNxuuvYKUtLh-korZEmg@mail.gmail.com>
References: <CADkLM=fwtE-TCU7sRnvaE74z12kOp_A+CdUwMr7aZt39pXbh6A@mail.gmail.com>
	<[email protected]>
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	<CA+TgmoYT2NnUueP5_=Z48XwVpyzciBfNxuuvYKUtLh-korZEmg@mail.gmail.com>


On 24.03.20 19:46, Robert Haas wrote:
>> Do we use shared_buffers for WAL ?
> No.

What's about the explanation in 
https://www.postgresql.org/docs/12/runtime-config-wal.html : 
"wal_buffers (integer)    The amount of shared memory used for WAL data 
that has not yet been written to disk. The default setting of -1 selects 
a size equal to 1/32nd (about 3%) of shared_buffers, ... " ? My 
understanding was, that the parameter wal_buffers grabs some of the 
existing shared_buffers for its own purpose. Is this a 
misinterpretation? Are shared_buffers and wal_buffers two different 
shared memory areas?

Kind regards, Jürgen

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