Skip site navigation (1) Skip section navigation (2)

Re: Postgresql 8.3 statistic stadistinct value dead wrong even with default_statistics_target=1000

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Maxim Boguk <mboguk(at)masterhost(dot)ru>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Postgresql 8.3 statistic stadistinct value dead wrong even with default_statistics_target=1000
Date: 2008-08-22 15:37:35
Message-ID: 13326.1219419455@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-general
Maxim Boguk <mboguk(at)masterhost(dot)ru> writes:
> [ ndistinct estimates way off ]

Estimating the number of distinct values in a distribution with a long
tail is just a really hard problem :-(

			regards, tom lane

In response to

Responses

pgsql-general by date

Next:From: Alvaro HerreraDate: 2008-08-22 16:02:41
Subject: Re: problem with foreign keys + data-only backup
Previous:From: Sam MasonDate: 2008-08-22 14:38:02
Subject: Re: SERIAL datatype

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group