| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> |
| Cc: | "Florian G(dot) Pflug" <fgp(at)phlo(dot)org>, "Pavan Deolasee" <pavan(dot)deolasee(at)enterprisedb(dot)com>, "Simon Riggs" <simon(at)2ndquadrant(dot)com>, "Bruce Momjian" <bruce(at)momjian(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: CREATE INDEX and HOT - revised design |
| Date: | 2007-03-30 17:54:01 |
| Message-ID: | 21734.1175277241@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
"Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> writes:
> Actually, if we are using Serializable Snapshot then there is no chance
> to replan the query before the transaction completes and the next
> transaction to start in the session must see the index and hence
> we must replan. So it would be enough just to associate a transaction
> id with the cached plan. If this xid is set and our transaction id is
> different than that, we replan.
Hm. So anytime we reject a potentially useful index as being not valid
yet, we mark the plan as "only good for this top-level transaction"?
That seems possibly workable --- in particular it doesn't get more
complicated as soon as you consider multiple such indexes.
regards, tom lane
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