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. RMSnRAC 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

Thank you for giving your valuable time to read the above information.

If you want to be updated with all our articles send us the Invitation or Follow us:

Skant Gupta’s LinkedIn: www.linkedin.com/in/skantali/

Joel Perez’s LinkedIn: Joel Perez’s Profile

Anuradha’s LinkedIn: Anuradha’s Profile

LinkedIn Group: Oracle Cloud DBAAS

Facebook Page: OracleHelp

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.