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From: Erik Rijkers <[email protected]>
To: Alvaro Herrera <[email protected]>
Cc: Jürgen Purtz <[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 11:08:02 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On 2020-05-17 08:51, Alvaro Herrera wrote:
> On 2020-May-17, Jürgen Purtz wrote:
> 
>> On 15.05.20 02:00, Alvaro Herrera wrote:
>> > Thanks everybody.  I have compiled together all the suggestions and the
>> >
>> > * I changed "instance", and made "cluster" be mostly a synonym of that.
>> In my understanding, "instance" and "cluster" should be different 
>> things,
> 
> 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.

For what it's worth, I've also always understood 'instance' as 'a 
running database'.  I admit it might be a left-over from my oracle 
years:

   
https://docs.oracle.com/cd/E11882_01/server.112/e40540/startup.htm#CNCPT601

There, 'instance' clearly refers to a running database.  When that 
database is stopped, it ceases to be an instance.  I've always 
understood this to be the same for the PostgreSQL 'instance'.  Once 
stopped, it is no longer an instance, but it is, of course, still a 
cluster.

I know, we don't have to do the same as Oracle, but clearly it's going 
to be an ongoing source of misunderstanding if we define such a 
high-level term differently.

Erik Rijkers

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