On Mon, Oct 1, 2018 at 6:23 AM Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> Attached patch adds a new option FREEZE_ONLY to VACUUM command. This
> option is same as FREEZE option except for it disables reclaiming dead
> tuples. That is, with this option vacuum does pruning HOT chain,
> freezing live tuples and maintaining both visibility map and freespace
> map but does not collect dead tuples and invoke neither heap vacuum
> nor index vacuum. This option will be useful if user wants to prevent
> XID wraparound a table as quick as possible, especially when table is
> quite large and is about to XID wraparound. I think this usecase was
> mentioned in some threads but I couldn't find them.
The feature seems like a reasonable one, but the name doesn't seem
like a good choice. It doesn't only freeze - e.g. it HOT-prunes, as
it must. Maybe consider something like (without_index_cleanup true)
or (index_cleanup false).
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
