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From: David G. Johnston <[email protected]>
To: [email protected] <[email protected]>
To: [email protected] <[email protected]>
Subject: Re: the concept of a database cluster
Date: Fri, 3 Jan 2020 01:21:05 -0700
Message-ID: <CAKFQuwYgLTMZHyqEDO2ge=gx1deY70gSLvLVcmZWNToiZ+v3tQ@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Thursday, January 2, 2020, PG Doc comments form <[email protected]>
wrote:

> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/12/creating-cluster.html
> Description:
>
> In 18.2, a database cluster is said to be "a database storage area on
> disk",
> and then shortly afterward is is defined as "a collection of databases that
> is managed by a single instance of a running database server". Those seem
> very different things. Sometimes in the manual I can't tell which usage is
> intended.
>

A garage is a “car storage area for a house”. A garage can (typically)
store multiple cars just as a database cluster can store multiple
databases.  The files are only useful if there is a running instance and
all databases stored in the cluster are managed by a single shared
instance.  You will need to better explain your confusion because the
documentation is describing a complex system accurately but in parts that
are related - two sides of the same coin, if you will.

David J.

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