A:ASM_POWER_LIMIT specifies the maximum power on an Automatic Storage Management instance for disk rebalancing. The higher the limit, the faster rebalancing will complete. Lower values will take longer, but consume fewer processing and I/O resources.
D: *Normally a separate process is fired up to do that rebalance. This will take a certain amount of time. If you want it to happen faster, fire up more processes. You tell ASM it can add more processes by increasing the rebalance power. *ASMB ASM Background Process Communicates with the ASM instance, managing storage and providing statistics
Incorrect: Not B: A higher, not a lower, value ofDISK_REPAIR_TIMEwould be helpful here. Not E:If you implement database writer I/O slaves by setting the DBWR_IO_SLAVES parameter, you configure a single (master) DBWR process that has slave processes that are subservient to it. In addition, I/O slaves can be used to "simulate" asynchronous I/O on platforms that do not support asynchronous I/O or implement it inefficiently. Database I/O slaves provide non-blocking, asynchronous requests to simulate asynchronous I/O.

AC (not E):
The md_restore command allows you to restore a disk group from the metadata created by the
md_backup command.
md_restore can't restore data, only metadata.

B: Through initialization parameters, you specify the file system directory to be used for a particular type of file. The database then ensures that a unique file, an Oracle-managed file, is created and deleted when no longer needed.
D: The database internally uses standard file system interfaces to create and delete files as needed for the following database structures:
Tablespaces Redo log files Control files Archived logs Block change tracking files Flashback logs RMAN backups
Note:
* Using Oracle-managed files simplifies the administration of an Oracle Database. Oracle-managed files eliminate the need for you, the DBA, to directly manage the operating system files that make up an Oracle Database. With Oracle-managed files, you specify file system directories in which the database automatically creates, names, and manages files at the database object level. For example, you need only specify that you want to create a tablespace; you do not need to specify the name and path of the tablespace's datafile with the DATAFILE clause.
Reference: What Are Oracle-Managed Files?

B:A PDB would have its SYSTEM, SYSAUX, TEMP tablespaces.It can also contains other user created tablespaces in it. *
Incorrect: Not A:High consolidation density. The many pluggable databases in a single container database share its memory and background processes, letting you operate many more pluggable databases on a particular platform than you can single databases that use the old architecture.
Not C, Not F:Oracle Database creates both the SYSTEM and SYSAUX tablespaces as part of every database.