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From: Laurenz Albe <[email protected]>
To: richard coleman <[email protected]>
To: Pgsql-admin <[email protected]>
Subject: Re: analyze foreign tables
Date: Thu, 03 Aug 2023 14:37:11 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAGA3vBt726ha1P91DrSOF8oc57X27tLO8o9Wi9oDN5L3qqRi7Q@mail.gmail.com>
References: <CAGA3vBt726ha1P91DrSOF8oc57X27tLO8o9Wi9oDN5L3qqRi7Q@mail.gmail.com>

On Tue, 2023-08-01 at 09:47 -0400, richard coleman wrote:
> In PostgreSQL foreign tables are not automatically analyzed and analyze must be
> specifically called on each table.  In the case of sharing tables between PostgreSQL
> clusters, there is the use_remote_estimate foreign server option.
> 
> In some of our multi terabyte databases, manually running analyze on all of the
> foreign tables can take more than a day.  This is per database containing the
> foreign schema.  Since we have certain large schema that we have centrally located
> and share to all of our other database clusters, this really adds up.

I just saw that PostgreSQL v16 uses remote sampling for ANALYZE on foreign tables.
This is governed by the option "analyze_sampling" on the foreign table or the foreign
server, and the default value "auto" should be just what you need.

Yours,
Laurenz Albe

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