A. he SPFILE is copied along with the datafiles of the pluggable databases (PDBs). The root and the seed database in the container database (CDB) are also duplicated.

B. A backup of pdb1 and pdb5 must exist before executing the command.

C. The duplicate command first creates a backup, and then duplicates the PDBs by using the backup.

D. An auxiliary instance must be started with the initialization parameter ENABLE_PLUGGABLE_DATABASE set to TRUE.

E. A backup of CDB and pdb1 and pdb5 must exist before executing the command.

A. FLASHBACK TABLE can undrop a column.

B. After a database is restored from flashback logs using the FLASHBACK DATABASE command, it is sometimes rolled forward using redo logs.

C. FLASHBACK DROP can undrop an index when undropping a table.

D. FLASHBACK VERSION QUERY can retrieve REDO records from ONLINE and ARCHIVED REDO LOG files.

E. FLASHBACK QUERY can retrieve REDO records from ONLINE and ARCHIVED REDO LOG files.

A. It removes the AUDSYS schema and the AUDIT_ADMIN and AUDIT_VIEWER roles

B. It sets all user tablespaces to "read-only" before starting the upgrade.

C. It increases tablespace size, if required, to meet upgrade requirements.

D. It performs prerequisite checks to verify if the Oracle database is ready for upgrade.

E. It recompiles all stored PL/SQL code by using utlrp.sql.

F. It empties the RECYCLE BIN.

A. defining foreign keys for all tables to speed up joins

B. the configuration of storage arrays

C. defining primary keys for all tables to speed up all queries

D. using check constraints to speed up updates

E. the physical data model

A. database writer performance

B. SQL statements

C. log writer performance

D. general operating system health

E. database instance memory management and sizes