Killable Processes in Oracle Database

A multiprocess Oracle database uses some additional processes called background processes. The background processes perform maintenance tasks required to operate the database and to maximize performance for multiple users.

• Mandatory Background Processes
• Optional Background Processes
• Slave Processes

There are few processes which we can kill without terminating the instance.

Killable:

1. ARCn: Redo log archivers
2. CJQn: Job scheduler coordinator
3. Dnnn: Dispatchers
4. DIA0: Diagnosability process 0
5. DIAG: Diagnosability coordinator
6. FDBA: Flashback data archiver process
7. Jnnn: Job scheduler processes
8. MMNL: Manageability Monitor Process 2
9. MMON: Manageability Monitor Process
10. PING: Interconnect latency measurement
11. Qnnn: Queue cleanup processes
12. QMNC: Queue coordinator
13. RECO: Distributed recovery process
14. Snnn: Shared servers
15. SMCO: Space management coordinator
16. Wnnn: Space management processes

Instance-Critical:

1. ACMS: Atomic controlfile to memory server
2. CKPT: Checkpoint
3. DBRM: Resource manager process
4. DBWn: Database writer processes
5. LGWR: Redo log writer
6. LMDn: Global enqueue service daemons
7. LMON: Global enqueue service monitor
8. MMAN: Memory manager
9. PMON: Process monitor
10. PSPn: Process spawners
11. RMSn: RAC management server
12. RVWR: Recovery writer
13. SMON: System monitor process
14. VKTM: Virtual keeper of time process

Note: Above processes were tested on Oracle 11g. “n” respresents the number

Source

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