Doc: small improvements for documentation about VACUUM freezing.

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

Commit: 975768f8eae2581b89ceafe8b16a77ff375207fe
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-09-06T21:50:53Z
Releases: 10.0
Doc: small improvements for documentation about VACUUM freezing.

Mostly, explain how row xmin's used to be replaced by FrozenTransactionId
and no longer are.  Do a little copy-editing on the side.

Per discussion with Egor Rogov.  Back-patch to 9.4 where the behavioral
change occurred.

Discussion: <575D7955.6060209@postgrespro.ru>

Files

PathChange+/−
doc/src/sgml/maintenance.sgml modified +35 −13

Documentation touched