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From: Tom Lane <tgl@sss.pgh.pa.us>
To: David G. Johnston <david.g.johnston@gmail.com>
Cc: Pg Docs <pgsql-docs@lists.postgresql.org>
Cc: Edson Richter <edsonrichter@hotmail.com>
Subject: Re: Partitioning docs (was Re: Range partitioning and overlap)
Date: Sat, 14 Nov 2020 13:11:29 -0500
Message-ID: <469467.1605377489@sss.pgh.pa.us> (raw)
In-Reply-To: <417734.1605323748@sss.pgh.pa.us>
References: <DM6PR13MB3988736CF8F5DC5720440231CFE60@DM6PR13MB3988.namprd13.prod.outlook.com>
	<CAKFQuwavKNFu5oAL4c36uuoWgsMBteSrBBxOg4nrPYoXokHYmw@mail.gmail.com>
	<DM6PR13MB3988F15C65F793B32C1E1F30CFE60@DM6PR13MB3988.namprd13.prod.outlook.com>
	<398613.1605301084@sss.pgh.pa.us>
	<414580.1605320014@sss.pgh.pa.us>
	<CAKFQuwZ+5Lz15bmMizx_dBd+E9LZ4nBKKc2XwxxD1CH=OxeK2g@mail.gmail.com>
	<417734.1605323748@sss.pgh.pa.us>

I wrote:
> "David G. Johnston" <david.g.johnston@gmail.com> writes:
>> I am curious as to your thoughts on unique indexes and whether/how to
>> better incorporate advice regarding the use of ON CONFLICT with
>> partitioning [1] vis-a-vis the overview's claim of:
>> "The partitioning substitutes for leading columns of indexes, reducing
>> index size and making it more likely that the heavily-used parts of the
>> indexes fit in memory" [2]

> Possibly a better way to write that claim is that partitioning can
> substitute for the upper levels of a huge index, rather than "leading
> columns" per se.  That way of looking at it is still sensible when
> a partition covers more than one value of the key column.

I changed it like that and pushed.

			regards, tom lane





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