[GENERAL] Not using index

[Crispin Miller]

Hi,
I have a table with about 8million tuples in it. I need to do a search
on two of the table's columns, so I've created a couple of indices, one
for each column.
Then I've run VACUUM ANALYZE. The query planner still wants to do a
sequential scan on the database. Any idea where I'm going wrong?
Crispin