Silke Trissl <trissl(at)informatik(dot)hu-berlin(dot)de> writes:
> I found out, that the change of the operator from '~*' to '=' for the
> item.description brought a great boost in performance (425 secs to 1
> sec!), but not in cost (Query plans at the end).
The main problem seems to be bad estimation of the number of rows
extracted from the item table. Have you ANALYZEd that table lately?
regards, tom lane
In response to
pgsql-performance by date
|Next:||From: Tom Lane||Date: 2004-04-28 13:05:04|
|Subject: Re: planner/optimizer question |
|Previous:||From: Rod Taylor||Date: 2004-04-28 12:23:35|
|Subject: Re: Simply join in PostrgeSQL takes too long|