Subject: New Background Processes In 10g
Doc ID: NOTE:268197.1
Last Revision Date: 03-OCT-2008
In this Document
Oracle Server - Enterprise Edition - Version: 10.1.0.2 to 10.2.0.4
Information in this document applies to any platform.
This article provides information on some new and some pre-existing background processes in 10G which may be
BACKGROUND PROCESS INFORMATION
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
- 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
- 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.
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These are job queue processes which are spawned as needed by CJQ0 to complete scheduled jobs. This is not a new
This is a new process Change Tracking Writer (CTWR) which works with