process big

my freebsd 4,7 this creating processes big of postgresql.
help me with some information?

PostgreSQL 7.3.1


CPU states:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100%
idle
Mem: 221M Active, 1890M Inact, 272M Wired, 118M Cache, 199M Buf, 9256K Free
Swap: 1024M Total, 276K Used, 1024M Free

  PID USERNAME  PRI NICE  SIZE    RES STATE    TIME   WCPU    CPU COMMAND
78121 postgres    2   0   128M   125M sbwait   2:07  6.40%  6.40% postgres
78415 postgres    2   0   128M 46572K sbwait   0:02  1.61%  1.61% postgres
76831 postgres    2   0   130M   126M sbwait   0:32  0.00%  0.00% postgres
76833 postgres    2   0   130M   126M sbwait   0:24  0.00%  0.00% postgres
78115 postgres    2   0   128M   115M sbwait   0:23  0.00%  0.00% postgres
  140 postgres    2   0   126M  1652K select   0:19  0.00%  0.00% postgres