On Mon, Oct 1, 2018 at 6:23 AM Masahiko Sawada <sawada.m...@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
