Do you mean one index on two columns? something like this: create index idx1 on tb1(col1, col2);
Thanks much! Xuefeng Zhu (Sherry) Crown Consulting Inc. -- Oracle DBA AIM Lab Data Team (703) 925-3192 Grzegorz Jaśkiewicz <gryz...@gmail.com> 04/07/2010 08:51 AM To Sherry CTR Zhu/AWA/CNTR/f...@faa cc Joel Jacobson <j...@gluefinance.com>, pgsql-performance@postgresql.org, Robert Haas <robertmh...@gmail.com> Subject Re: [PERFORM] LIMIT causes planner to do Index Scan using a less optimal index On Wed, Apr 7, 2010 at 1:20 PM, <sherry.ctr....@faa.gov> wrote: Guys, Thanks for trying and opening your mind. If you want to know how Oracle addressed this issue, here it is: index on two columns. I remember that they told me in the training postgres has no this kind of index, can someone clarify? lies. postgresql allows you indices on multiple columns. What it does not have, is index on multiple tables. -- GJ
