Re: two queries and dual cpu (perplexed)
| От | Jeff |
|---|---|
| Тема | Re: two queries and dual cpu (perplexed) |
| Дата | |
| Msg-id | 8c459b7b96e6c310d641cebdfa8dcab6@torgo.978.org обсуждение исходный текст |
| Ответ на | two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)") |
| Ответы |
Re: two queries and dual cpu (perplexed)
(Gavin Sherry)
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)") Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)") Re: two queries and dual cpu (perplexed) (Kenneth Marshall) |
| Список | pgsql-performance |
Дерево обсуждения
two queries and dual cpu (perplexed)
("Shoaib Burq (VPAC)",
)
Re: two queries and dual cpu (perplexed) (Jeff, )
Re: two queries and dual cpu (perplexed) (Gavin Sherry, )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) (Russell Smith, )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) (John A Meinel, )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) (Gavin Sherry, )
Re: two queries and dual cpu (perplexed) (Jeff, )
Re: two queries and dual cpu (perplexed) (Tom Lane, )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) (John A Meinel, )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) (Kenneth Marshall, )
Re: two queries and dual cpu (perplexed) (Daniel Schuchardt, )
Re: two queries and dual cpu (perplexed) ("Dave Held", )
Re: two queries and dual cpu (perplexed) (Jeff, )
Re: two queries and dual cpu (perplexed) (Gavin Sherry, )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) (Russell Smith, )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) (John A Meinel, )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) (Gavin Sherry, )
Re: two queries and dual cpu (perplexed) (Jeff, )
Re: two queries and dual cpu (perplexed) (Tom Lane, )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) (John A Meinel, )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) ("Shoaib Burq (VPAC)", )
Re: two queries and dual cpu (perplexed) (Kenneth Marshall, )
Re: two queries and dual cpu (perplexed) (Daniel Schuchardt, )
Re: two queries and dual cpu (perplexed) ("Dave Held", )
On Apr 21, 2005, at 7:49 AM, Shoaib Burq (VPAC) wrote: > Now I have not touch the $PGDATA/postgresql.conf (As I know very little > about memory tuning) Have run VACCUM & ANALYZE. > You should really, really bump up shared_buffers and given you have 8GB of ram this query would likely benefit from more work_mem. > and the time taken is *twice* that for the original. The modification > was > minor. The queries do make use of both CPUs: > Is this an IO intensive query? If running both in parellel results in 2x the run time and you have sufficient cpus it would (to me) indicate you don't have enough IO bandwidth to satisfy the query. Can we see an explain analyze of the query? Could be a bad plan and a bad plan will never give good performance. -- Jeff Trout <> http://www.jefftrout.com/ http://www.stuarthamm.net/
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