Horton

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

Nathan Bossart <bossartn@amazon.com>

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From: "Bossart, Nathan" <bossartn@amazon.com>
To: "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2017-05-10T20:10:48Z
Lists: pgsql-hackers

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Hi Hackers,

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’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 attached patch requires that only one table be specified in order to specify a column list.  But before I spend too much more time working on this, I thought I’d see how pgsql-hackers@ felt about this feature.

Thanks,
Nathan Bossart

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.