Oracle Enterprise Manager Conclusion
You should now have a good understanding of the new features within Oracle.
This module discussed
- the backup and recovery scripts within RMAN, which will help you manage the database better;
- the new features within export/import;
- the workings of OEM; and
- the way standby and read-only databases work.
Now that you have completed this module, you should be able to:
- Identify the new features within RMAN
- Explain Fast-Start Fault Recovery
- Explain the new concepts within stand-by database
- Describe the improvements within export/import utilities
- Explore the features of OEM
RMAN Interaction with a Media Manager
Before performing backup or restore to a media manager, you must allocate one or more channels to handle the communication with the media manager.
You can also configure default channels for use with the media manager, which will be applied for all backup and recovery tasks that use the media manager where you do not explicitly allocate channels.
RMAN does not issue specific commands to load, label, or unload tapes. When backing up, RMAN gives the media manager a stream of bytes and associates a unique name with this stream.
When RMAN needs to restore the backup, it asks the media manager to retrieve the byte stream. All details of how and where that stream is stored are handled entirely by the media manager.
For example, the media manager labels and keeps track of the tape and names of files on each tape, and automatically loads and unloads tapes, or signals an operator to do so.
Some media managers support proxy copy functionality, in which they handle the entire data movement between datafiles and the backup devices. Such products may use technologies such as high-speed connections between storage and media subsystems to reduce load on the primary database server. RMAN provides a list of files requiring backup or restore to the media manager, which in turn makes all decisions regarding how and when to move the data.
In this module, you were introduced to the following term file affinity.
File affinity is when the export file created has the role and responsibility of the user within it and when the file is imported by another user,
this user must have the same set of roles and responsibility to complete an import.
In the next module, we will explore the new features and enhancements of Recovery Manager.