From: Tom Lane <tgl@sss.pgh.pa.us>
To: Murthy Nunna <mnunna@fnal.gov>
Cc: pgsql-admin@postgresql.org <pgsql-admin@postgresql.org>
Subject: Re: pg_dump -Are statistics saved?
Date: Mon, 27 Nov 2023 19:45:45 -0500
Message-ID: <4040678.1701132345@sss.pgh.pa.us> (raw)
In-Reply-To: <DM8PR09MB6677154B85D10BF16F8379CBB8BCA@DM8PR09MB6677.namprd09.prod.outlook.com>
References: <DM8PR09MB6677154B85D10BF16F8379CBB8BCA@DM8PR09MB6677.namprd09.prod.outlook.com>
Murthy Nunna <mnunna@fnal.gov> writes:
> The pg_dump (used verbose) log said "pg_dump: reading extended statistics".
> Does it mean it saved statistics and they can be restored with pg_restore?
What that means is that it will output clones of any CREATE STATISTICS
commands you may have issued.
> If not, is it necessary to run ANALYZE after pg_restore?
That has always been necessary after a dump/restore, and still is.
The pg_dump man page makes this clear enough, I should think:
The dump file produced by pg_dump does not contain the statistics used
by the optimizer to make query planning decisions. Therefore, it is
wise to run ANALYZE after restoring from a dump file to ensure optimal
performance; see Section 25.1.3 and Section 25.1.6 for more
information.
regards, tom lane
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To: pgsql-admin@postgresql.org
Cc: tgl@sss.pgh.pa.us, mnunna@fnal.gov
Subject: Re: pg_dump -Are statistics saved?
In-Reply-To: <4040678.1701132345@sss.pgh.pa.us>
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