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From: Jürgen Purtz <[email protected]>
To: Alvaro Herrera <[email protected]>
Cc: Erik Rijkers <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: Fabien COELHO <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: Corey Huinker <[email protected]>
Cc: Justin Pryzby <[email protected]>
Cc: Roger Harkavy <[email protected]>
Cc: [email protected]
Cc: Michael Paquier <[email protected]>
Subject: Re: Add A Glossary
Date: Sun, 17 May 2020 10:44:43 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On 17.05.20 08:51, Alvaro Herrera wrote:
>> On 15.05.20 02:00, Alvaro Herrera wrote:
>>> Thanks everybody.  I have compiled together all the suggestions and the
>>> result is in the attached patch.  Some of it is of my own devising.
>>>
>>> * I changed "instance", and made "cluster" be mostly a synonym of that.
>> In my understanding, "instance" and "cluster" should be different things,
>> not only synonyms. "instance" can be the term for permanently fluctuating
>> objects (processes and RAM) and "cluster" can denote the more static objects
>> (directories and files). What do you think? If you agree, I would create a
>> patch.
> I don't think that's the general understanding of those terms.  For all
> I know, they*are*  synonyms, and there's no specific term for "the
> fluctuating objects" as you call them.  The instance is either running
> (in which case there are processes and RAM) or it isn't.
>
We have the basic tools "initdb — create a new PostgreSQL database 
cluster" which affects nothing but files, and we have "pg_ctl — 
initialize, start, stop, or control a PostgreSQL server" which - 
directly - affects nothing but processes and RAM. (Here the term 
"server" collides with new definitions in the glossary. But that's 
another story.)

--

Jürgen Purtz

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