| From: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
|---|---|
| To: | Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com> |
| Cc: | Martijn van Oosterhout <kleptog(at)svana(dot)org>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Free space management within heap page |
| Date: | 2007-01-23 09:33:28 |
| Message-ID: | 45B5D668.5050406@enterprisedb.com |
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| Thread: | |
| Lists: | pgsql-hackers |
Pavan Deolasee wrote:
> One assumption I am making here is that its sufficient to mark the line
> pointer
> "unused" (reset LP_USED flag) even though there is an index entry pointing
> to
> the tuple. During index scan, we anyways check for ItemIdIsUsed() before
> proceeding further. I know it might break the ctid chain, but does that
> really
> matter ? I don't see any reason why somebody would need to follow ctid
> chain
> past a dead tuple.
You can't clear the LP_USED flag, but you could use the LP_DELETE flag
that's currently not used in heap pages.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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