| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Martin Marques <martin(at)marquesminen(dot)com(dot)ar> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: meaning of default_statistics_target |
| Date: | 2008-04-28 14:57:39 |
| Message-ID: | 20080428145739.GA5761@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Martin Marques escribió:
> Is the value measured in some scale, or does it depend on something
> internal? What does 1000 mean?
1000 histogram and MCV entries, and also a larger sample:
>> Increasing the target also increases the number of rows that ANALYZE
>> samples to prepare the stats, so you should theoretically get more
>> accurate stats for the other columns too, even though they'll still get
>> boiled down to the same array lengths as before.
How larger is the sample, I don't know.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Craig Ringer | 2008-04-28 15:48:29 | Re: How to modify ENUM datatypes? |
| Previous Message | Martin Marques | 2008-04-28 14:49:22 | Re: meaning of default_statistics_target |