Processos Oracle

Alguém sabe o que são esses processos Oracle ???

385 oracle 16 0 1636m 30m 29m S 0.0 1.5 0:00.24 ora_smon_PD01
409 oracle 17 0 1637m 18m 17m S 0.0 0.9 0:00.86 ora_qmn0_PD01
379 oracle 16 0 1650m 15m 7996 S 0.0 0.8 0:00.16 ora_dbw0_PD01
393 oracle 16 0 1637m 14m 13m S 0.0 0.7 0:00.08 ora_s000_PD01
381 oracle 16 0 1652m 12m 7056 S 0.0 0.6 0:00.15 ora_lgwr_PD01
399 oracle 16 0 1640m 10m 6076 S 0.0 0.5 0:00.08 ora_arc0_PD01
387 oracle 17 0 1636m 10m 9352 S 0.0 0.5 0:00.03 ora_reco_PD01
389 oracle 16 0 1636m 9836 8780 S 0.0 0.5 0:00.03 ora_cjq0_PD01
377 oracle 16 0 1637m 8824 7400 S 0.0 0.4 0:00.04 ora_pmon_PD01
397 oracle 16 0 1637m 7832 6380 S 0.0 0.4 0:00.04 ora_d000_PD01
383 oracle 16 0 1636m 7580 6532 S 0.0 0.4 0:00.03 ora_ckpt_PD01
401 oracle 16 0 1640m 6972 5884 S 0.0 0.3 0:00.03 ora_arc1_PD01
395 oracle 16 0 1637m 6788 5540 S 0.0 0.3 0:00.03 ora_s001_PD01