Re: Fwd: Help required on query performance

After doing an analyze on the database, it improved a lot :)



On Mon, Feb 1, 2010 at 12:13 PM, Scott Marlowe <scott.marlowe@gmail.com> wrote:
> On Sun, Jan 31, 2010 at 6:09 PM, Dave Clements <dclements89@gmail.com> wrote:
>> I did the re-analyze serveral times, using the command:
>>
>> ANALYZE tablename;
>>
>> Is there any other command as well or another way to do that?
>
> It's important that the stats target get increased as well, it looks
> like you're not getting enough buckets to get a good estimate of rows
> to be returned for various conditions.
>
> # show default_statistics_target ;
>  default_statistics_target
> ---------------------------
>  10
>
> # alter database smarlowe set default_statistics_target=200;
> ALTER DATABASE
> # analyze;
>
> Then run the explain analyze again and see if your row estimates are
> closer and if the plan changes.
>