From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
---|---|
To: | "libcub(at)hotmail(dot)com" <libcub(at)hotmail(dot)com>, "pgsql-docs(at)lists(dot)postgresql(dot)org" <pgsql-docs(at)lists(dot)postgresql(dot)org> |
Subject: | Re: the concept of a database cluster |
Date: | 2020-01-03 08:21:05 |
Message-ID: | CAKFQuwYgLTMZHyqEDO2ge=gx1deY70gSLvLVcmZWNToiZ+v3tQ@mail.gmail.com |
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Lists: | pgsql-docs |
On Thursday, January 2, 2020, PG Doc comments form <noreply(at)postgresql(dot)org>
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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