APPLIES TO:

Oracle Database - Enterprise Edition - Version 12.1.0.1 and later


Information in this document applies to any platform.


PURPOSE

This article provides information on new background processes introduced in 12c


A complete list of background processes can be found in the Oracle Documentation:

​​https://docs.oracle.com/database/121/REFRN/GUID-86184690-5531-405F-AA05-BB935F57B76D.htm#REFRN104​​


DETAILS

*  BWnn  There can be 1 to 100 Database Writer Processes. The names of the first 36 Database Writer Processes are DBW0-DBW9 and DBWa-DBWz. The names of the 37th through 100th Database Writer Processes are BW36-BW99. The database selects an appropriate default setting for the DB_WRITER_PROCESSES parameter or adjusts a user-specified setting based on the number of CPUs and processor groups.

 

*  FENC (Fence Monitor Process) Processes fence requests for RDBMS instances which are using Oracle ASM instances



*  IPC0 (IPC Service Background Process) Common background server for basic messaging and RDMA primitives based on IPC (Inter-process communication) methods.


* LDDn (Global Enqueue Service Daemon Helper Slave) Helps the LMDn processes with various tasks


* LGnn (Log Writer Worker) On multiprocessor systems, LGWR creates worker processes to improve the performance of writing to the redo log. LGWR workers are not used when there is a SYNC standby destination. Possible processes include LG00-LG99.


*LREG  (Listener Registration Process) Registers the instance with the listeners

 

*OFSD (Oracle File Server Background Process) Serves file system requests submitted to an Oracle instance


* RPOP (Instant Recovery Repopulation Daemon) Responsible for re-creating and/or repopulating data files from snapshot files and backup files


*  SAnn (SGA Allocator) Allocates SGA  The SAnn process allocates SGA in small chunks. The process exits upon completion of SGA allocation.


*  SCRB (ASM Disk Scrubbing Master Process) Coordinates Oracle ASM disk scrubbing operations


* SCRn  (ASM Disk Scrubbing Slave Repair Process) Performs Oracle ASM disk scrubbing repair operation

 

* SCVn  (ASM Disk Scrubbing Slave Verify Process) Performs Oracle ASM disk scrubbing verify operation


New Background Processes In 12c (Doc ID 1625912.1)