pg_stat

Hi,

I have query:
select pg_stat_get_numscans(76529669),
pg_stat_get_blocks_fetched(76529669),
pg_stat_get_blocks_hit(76529669);

The result is:
 pg_stat_get_numscans | pg_stat_get_blocks_fetched |
pg_stat_get_blocks_hit
----------------------+----------------------------+------------------------
                    0 |                      23617 |
               23595
(1 row)

My questions are:
1. How can index disk blocks be requested (either
from disk or cache) without index scan?
2. If I want to check if an index is used after
pg_stat_reset(), how can I get it? By number of scans
or block requests, or some other ways?

Thanks,




__________________________________
Do you Yahoo!?
Win a $20,000 Career Makeover at Yahoo! HotJobs
http://hotjobs.sweepstakes.yahoo.com/careermakeover