| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
| Cc: | Peter Kovacs <peter(dot)kovacs(dot)1(dot)0rc(at)gmail(dot)com>, Scott Ribe <scott_ribe(at)killerbytes(dot)com>, "pgsql-general postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Clearing plans |
| Date: | 2007-01-19 17:12:36 |
| Message-ID: | 16778.1169226756@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
> On Thu, Jan 18, 2007 at 10:08:24PM +0100, Peter Kovacs wrote:
>> Are the plans cached per connection? Why not globally?
> Because global plan caching is much harder and nobody has done it yet?
The idea's been discussed before, and there are at least three problems
with it:
* unpredictability of shared-memory requirement
* plan cache would become a contention hot-spot
* much greater need for explicit cache management operations ("restart
your session" would no longer substitute for a flush-the-cache command)
regards, tom lane
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