Horton

Re: [Proposal] Allow users to specify multiple tables in VACUUM commands

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: "Bossart, Nathan" <bossartn@amazon.com>
Cc: "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2017-05-10T21:40:08Z
Lists: pgsql-hackers 
"Bossart, Nathan" <bossartn@amazon.com> writes:
> Currently, VACUUM commands allow you to specify one table or all of the tables in the current database to vacuum.  I’ve recently found myself wishing I could specify multiple tables in a single VACUUM statement.  For example, this would be convenient when there are several large tables in a database and only a few need cleanup for XID purposes.  Is this a feature that the community might be interested in?

I'm a bit surprised to realize that we don't allow that, since the
underlying code certainly can do it.

You realize of course that ANALYZE should grow this capability as well.

> I’ve attached my first attempt at introducing this functionality.  In the patch, I’ve extended the table_name parameter in the VACUUM grammar to a qualified_name_list.  While this fits into the grammar decently well, I suspect that it may be desirable to be able to specify a column list for each table as well (e.g. VACUUM foo (a), bar (b)).

The column list only matters for ANALYZE (or VACUUM ANALYZE).  But yes,
it should be per-table.

			regards, tom lane

Commits

  1. Allow multiple tables to be specified in one VACUUM or ANALYZE command.

  2. Give a better error for duplicate entries in VACUUM/ANALYZE column list.

  3. Reject ANALYZE commands during VACUUM FULL or another ANALYZE.