Background Process Information

Here's a list of background processes:
MMAN (10g)
SGA Background Process
The Automatic Shared Memory Management feature uses a new background process named Memory Manager (MMAN). MMAN serves as the SGA Memory Broker and coordinates the sizing of the memory components. The SGA Memory Broker keeps track of the sizes of the components and pending resize operations

RVWR (10g)
Flashback database
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- This a new feature introduced in 10g.
- Flashbacking a database means going back to a previous database state.
- The Flashback Database feature provides a way to quickly revert an entire Oracle database to the state it was in at a past point in time.
- This is different from traditional point in time recovery.
- A new background process Recovery Writer ( RVWR) introduced which is responsible for writing flashback logs which stores pre-image(s) of data blocks
- One can use Flashback Database to back out changes that:
- Have resulted in logical data corruptions.
- Are a result of user error.
- This feature is not applicable for recovering the database in case of media failure.
- The time required for flashbacking a database to a specific time in past is DIRECTLY PROPORTIONAL to the number of changes made and not on the size of the database.

Jnnn (10g)
These are job queue processes which are spawned as needed by CJQ0 to complete scheduled jobs. This is not a new process.

CTWR (10g)
This is a new process Change Tracking Writer (CTWR) which works with the new block changed tracking features in 10g for fast RMAN incremental backups.

MMNL (10g)
The Memory Monitor Light (MMNL) process is a new process in 10g which works with the Automatic Workload Repository new features (AWR) to write out full statistics buffers to disk as needed.

MMON (10g)
The memory monitor (MMON) process was introduced in 10g and is associated with the Automatic Workload Repository new features used for automatic problem detection and self-tuning. MMON writes out the required statistics for AWR on a scheduled basis.

CJQn (10g)
This is the Job Queue monitoring process which is initiated with the job_queue_processes parameter. This is not new. More Info DOCID=222190.1