Automatic Shared Memory Management (ASMm) is enabled for your database instance, but parameters for the managed components are not defined.
You execute this command:
SQL> ALTER SYSTEM SET DB_CACHE_SIZE = 100M;
Which statement is true?

Examine the command to duplicate a database:
RMAN> DUPLICATE TARGET DATABASE TO cdb
PLUGGABLE DATABASE pdb1, pdb5;
Which two statements are true about the DUPLICATEcommand? (Choose two.)

One of your databases is in ARCHIVELOG mode and take nightly RMAN backups.
The USERS and IDX tablespaces are missing due to storage array errors.
Which four actions would recover the tablespaces and their contents while the database remains open?
(Choose four.)

A database instance uses an SPFILE. Examine the parameter:

You plan to multiplex the control file to a new location, parallelization for the backup set./u01/app/oracle/oradata/cdb1/disk3/control03.ctl/.
Examine the possible steps that are in random order:
1. Shut down the database instance.
2.Issue ALTER SYSTEM SET CONTROL_FILES= '/u01/app/oracle/oradata/cdb1/disk1/control01.ctl,
/u01/app/oracle/oradata/cdb1/disk2/control02, ctl,
/u01/app/oracle/oradata/cdb1/disk3/control03.ctl'
SCOPE=SPFILE;.
3. Issue ALTER SYSTEM SET CONTROL_FILES
'/u01/app/oracle/oradata/cdb1/disk1/control01.ctl, /u01/app/oracle/oradata/cdb1/disk2/control02.ctl,
/u01/app/oracle/oradata/cdb1/disk3/control03.ctl';.
4. Copy the control file from the existing location to '/u01/app/oracle/oradata/cdb1/disk3/control03.ctl'.
5. Mount the database.
6. Open the database.
Identify the required steps in the correct order to accomplish the task.

You want to reduce fragmentation and reclaim unused space for the sales table but not its dependent objects. During this operation, you want to ensure the following:
i. Long-running queries are not affected.
ii. No extra space is used.
iii. Data manipulation language (DML) operations on the table succeed at all times throughout the process.
iv. Unused space is reclaimed both above and below the high water mark.
Which alter TABLE option would you recommend?