Re: Fwd: Clarification about HOT

Gokulakannan Somasundaram wrote:
> Thanks Heikki. To clarify, there won't be any redirect-line pointers in this
> implementation. That space is saved. We will have the index tuple point to
> the latest live tuple in the update chain.  So no need for redirect-line
> pointers.

The redirected line pointers are there for a reason. The reason is to be 
able to retail vacuum (= prune) a page without having to do a regular 
vacuum, scanning all indexes.

If you lose that ability, the idea is dead in the water.

--   Heikki Linnakangas  EnterpriseDB   http://www.enterprisedb.com