これって、postmasterの２重起動っすか？

[postgres pgsql]$ ps aux | grep post
postgres 2000 0.0 0.4 5056 840 ? SN Oct31 0:02 [postmaster]
postgres 2661 0.0 0.0 4916 0 ? SWN Oct31 0:00 [postmaster]
postgres 3479 0.0 1.1 5072 2308 ? SN Oct31 0:00
/usr/bin/postgres
postgres 3482 0.0 1.1 5072 2308 ? SN Oct31 0:00
/usr/bin/postgres
root 13094 0.0 0.5 2120 1056 pts/0 S 02:00 0:00 login --
postgres
postgres 13095 0.0 0.4 1692 924 pts/0 S 02:00 0:00 -bash
postgres 13624 0.0 0.3 2324 688 pts/0 R 02:07 0:00 ps aux
postgres 13625 0.0 0.4 1692 924 pts/0 R 02:07 0:00 -bash