Search Postgresql Archives

Re: index vs. seq scan choice?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



George Pavlov wrote:
From: Tom Lane [mailto:tgl@xxxxxxxxxxxxx] "George Pavlov" <gpavlov@xxxxxxxxxxxxxx> writes:

to 977ms! If I go the other way and SET STATISTICS 1 (or 0) I can bring
down the list to one entry (setting to 0 seems equivalent and still
keeps the one most common entry!?) and I will get the Index scan for all
states except for that one most common state. But, of course, I don't
want to undermine the whole stats mechanism, I just want the system to
use the index that is so helpful and brings runtimes down by a factor of
4-8! What am I missing here?

In those rare cases wouldn't it make more sense to just set enable_seqscan to off; run query; set enable_seqscan to on;

??

Joshua D. Drake



George

---------------------------(end of broadcast)---------------------------
TIP 3: Have you checked our extensive FAQ?

               http://www.postgresql.org/docs/faq



--

      === The PostgreSQL Company: Command Prompt, Inc. ===
Sales/Support: +1.503.667.4564 || 24x7/Emergency: +1.800.492.2240
Providing the most comprehensive  PostgreSQL solutions since 1997
             http://www.commandprompt.com/

Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate
PostgreSQL Replication: http://www.commandprompt.com/products/



[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Postgresql Jobs]     [Postgresql Admin]     [Postgresql Performance]     [Linux Clusters]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Postgresql & PHP]     [Yosemite]
  Powered by Linux