Another "why am I not using the indicies?"

Here is all the information about the system and the steps I took.  If you
can tell me or point me in the right direction I would appreciate it. There
are 624306 records in this table, so it only takes a few seconds, but this
is going to grow to 5M rows/month when this works properly.

Clinton James

#select version();
                               version
----------------------------------------------------------------------
 PostgreSQL 7.1rc4 on i686-pc-linux-gnu, compiled by GCC egcs-2.91.66
(1 row)

#CREATE TABLE ld (
  billmonth CHAR(4),
  cust_num  CHAR(8),
  location  CHAR(4),
  date      TIMESTAMP,
  orignum   CHAR(10),
  destnum   CHAR(13),
  destcity  CHAR(10),
  deststate CHAR(2),
  duration  NUMERIC(8,1),
  callcode  CHAR(9),
  cost      NUMERIC(10,4)
);

#copy ld from '/tmp/ld0104.txt';

#create index ld_custnum_idx ON ld(cust_num);
#create index ld_orignum_idx ON ld(orignum);

#vacuum analyze;

# explain select * from ld where cust_num = '10102899';
NOTICE:  QUERY PLAN:

Seq Scan on ld  (cost=0.00..20810.83 rows=8989 width=128)