>>>>> "Robert" == Robert Haas <robertmh...@gmail.com> writes:
Robert> One idea that occurred to me is to somehow record -- I guess in Robert> pg_class using non-transactional updates -- the last cutoff XID Robert> used to vacuum any given table. Then we could just make a rule Robert> that you can't vacuum the TOAST table with an XID that's newer Robert> than the last one used for the main table. That would preserve Robert> the property that you can vacuum the tables separately while Robert> avoiding dangling pointers. But that's obviously not Robert> back-patchable, The suggestion made previously (in a historical thread) was to use an entry in the reloptions field for this, at least in back branches. It would be necessary for vacuum to add the entry initially in a normal transactional update, after which it could be updated inplace. -- Andrew (irc:RhodiumToad)
