Doc: small improvements for documentation about VACUUM freezing.

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

Commit: db88112ce17f05b211cf6e2c50f1dd7107556786
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-09-06T21:50:53Z
Releases: 9.4.10
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 +32 −10