The post provides information on new background processes introduced in 12c.
|BWnn||Database Writer Processes|
|FENC||Fence Monitor Process|
|IPC0||IPC Service Background Process|
|LDDn||Global Enqueue Service Daemon Helper Slave|
|LGnn||Log Writer Worker|
|LREG||Listener Registration Process|
|OFSD||Oracle File Server Background Process|
|RPOP||Instant Recovery Repopulation Daemon|
|SCRB||ASM Disk Scrubbing Master Process|
|SCRn||ASM Disk Scrubbing Slave Repair Process|
|SCVn||ASM Disk Scrubbing Slave Verify Process|
BWnn – Database Writer Processes
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
FENC 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.
ASM background processes in 11gR2
Understanding Oracle Background Processes