Обсуждение: Reindex time?
A quick question. We're reindexing a table with 1.2 million tuples and around 10 indexes. # REINDEX TABLE tlogs; Does anyone have any anecdotes about the time that a reindex should take? - Ericson Smith http://www.did-it.com eric@did-it.com
At 05:58 AM 7/31/2002 , Ericson Smith wrote: >A quick question. > >We're reindexing a table with 1.2 million tuples and around 10 indexes. > ># REINDEX TABLE tlogs; > >Does anyone have any anecdotes about the time that a reindex should >take? I would imagine it depends on how much you have in the way of system resources (memory, cpu (how fast, how many)) at the time it is done. But to the list, supposing the entire machine was idle, would a reindex spread itself amount cpu's, and perform the task in pieces, or is it bound to a cpu? >- Ericson Smith >http://www.did-it.com >eric@did-it.com > > > > > > >---------------------------(end of broadcast)--------------------------- >TIP 5: Have you checked our extensive FAQ? > >http://www.postgresql.org/users-lounge/docs/faq.html ---------------------------------------------------------------------------- ---------------------------------- Naomi Walker Eldorado Computing, Inc Chief Information Officer nwalker@eldocomp.com 602-604-3100 x242
On Wed, Jul 31, 2002 at 09:32:55AM -0700, Naomi Walker wrote:
>
> But to the list, supposing the entire machine was idle, would a reindex
> spread itself amount cpu's, and perform the task in pieces, or is it bound
> to a cpu?
A single REINDEX command works with one backend, which is a single
process. Therefore, it'll only work on one CPU.
A
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Andrew Sullivan 87 Mowat Avenue
Liberty RMS Toronto, Ontario Canada
<andrew@libertyrms.info> M6K 3E3
+1 416 646 3304 x110
Here's what I found when the thing was finally completed: Hardware: Dual AMD 1600+, 4GB Ram, 110GB RAID, 2GB in shared memory for Pg Environment: We turned off most access to the database, load was down to about .2 when we started. We *did not* run a single process, as the manuals recommended. Reindex took ~45 Minutes on a single table with 10 indices, and 1.2Million Tuples. The reindex process ran on only a single CPU. - Ericson Smith Web Developer http://www.did-it.com eric@did-it.com On Wed, 2002-07-31 at 12:32, Naomi Walker wrote: > At 05:58 AM 7/31/2002 , Ericson Smith wrote: > >A quick question. > > > >We're reindexing a table with 1.2 million tuples and around 10 indexes. > > > ># REINDEX TABLE tlogs; > > > >Does anyone have any anecdotes about the time that a reindex should > >take? > > I would imagine it depends on how much you have in the way of system > resources (memory, cpu (how fast, how many)) at the time it is done. > > But to the list, supposing the entire machine was idle, would a reindex > spread itself amount cpu's, and perform the task in pieces, or is it bound > to a cpu? > > > > >- Ericson Smith > >http://www.did-it.com > >eric@did-it.com > > > > > > > > > > > > > >---------------------------(end of broadcast)--------------------------- > >TIP 5: Have you checked our extensive FAQ? > > > >http://www.postgresql.org/users-lounge/docs/faq.html > > ---------------------------------------------------------------------------- > ---------------------------------- > Naomi Walker > Eldorado Computing, Inc > Chief Information Officer > nwalker@eldocomp.com > 602-604-3100 x242 > >