Alvaro Herrera wrote:
> I didn't know we were doing HOT pruning during vacuum; does
> it make sense?
Removing HOT-updated, dead tuples is a bit complicated. It needs to be
done one HOT-chain at a time, and the root line pointer needs to be
updated to the next live tuple in the chain. lazy_scan_heap() calls the
regular pruning function heap_page_prune() to deal with those before
doing the normal scan of line pointers.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com