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NEW QUESTION 21
Which two are true about changing the LOCAL_UNDO_ENABLED property to false in a CDB? (Choose two.)

A. Any new PDB and existing PDBs are automatically configured to use the default undo tablespace in CDB$ROOT.B. After the change, only a common user with the required privilege can create an undo tablespace in CDB&ROOT.C. Undo tablespaces existing in PDBs must be dropped before the change.D. After the change, only one undo tablespace can exist in CDB$ROOT.E. After the change, any user with the required privilege can create an undo tablespace in the PDBs.F. After the change, each existing PDB has to be reopened for the new undo mode to take effect.

Answer: A,D

Explanation:
You can set a CDB in local UNDO mode either at CDB creation or by altering the CDB property. When the database property LOCAL_UNDO_ENABLE is FALSE, which is the default, there is only one UNDO tablespace that is created in the CDB root, and that is shared by all containers. When LOCAL_UNDO_ENABLE is TRUE, every container in the CDB uses local undo and each PDB must have its own local UNDO tablespace. To maintain ease of management and provisioning, UNDO tablespace creation happens automatically and does not require any action from the user. When a PDB is opened and an UNDO tablespace is not available, its automatically created.
Reference:
https://docs.oracle.com/en/database/oracle/oracle-database/18/multi/creating-and-configuring-a- cdb.html#GUID-12ADA04D-F81D-4579-A68C-0958CC7D6C2F

 

NEW QUESTION 22
Choose two. Which two are true about gathering optimizer statistics?

A. Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to a PDB opened in read/ write mode gathers object statistics for that PDB.B. Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to CDB$ROOT gathers object statistics in all open pluggable databases (PDBs).C. Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to CDB$ROOT gathers object statistics only in CDB$ROOT.D. Executing DBMS_STATS.GATHER_DATABASE_STATS while connected to CDB$ROOT gathers object statistics only in PDB$SEED.E. System statistics can be gathered only while the CDB is in MOUNT state.

Answer: A,C

 

NEW QUESTION 23
Choose two. For which two tasks can you use the DBMS_PDB.DESCRIBE procedure?

A. to determine whether an XML file describes a PDB that can be plugged into the CDB in which you run the procedureB. to generate a . pdb archive file for any PDB in the current CDBC. to generate an XML metadata file that describes a non-CDB Oracle 12c database so that it can be plugged in as a PDBD. to generate an XML metadata file from any unplugged PDBE. to generate an XML metadata file that describes the current plugged-in PDB

Answer: C,E

 

NEW QUESTION 24
Which three actions are performed by Database Upgrade Assistant (DBUA)? (Choose three.)

A. It removes the AUDSYS schema and the AUDIT_ADMIN and AUDIT_VIEWER rolesB. It recompiles all stored PL/SQL code by using utlrp.sql.C. It empties the RECYCLE BIN.D. It increases tablespace size, if required, to meet upgrade requirements.E. It sets all user tablespaces to "read-only" before starting the upgrade.F. It performs prerequisite checks to verify if the Oracle database is ready for upgrade.

Answer: B,D,F

Explanation:
Reference:
https://oracle-base.com/articles/12c/upgrading-to-12c

 

NEW QUESTION 25
Choose the best answer You want to create a duplicate database DUP_DB from your production database PROD on the same host. The PROD database uses Automatic Storage Management (ASM) for storage. Regular backups are taken using RMAN connected to a recovery catalog. You create an auxiliary instance and want to execute the command: RMAN> DUPLICATE TARGET DATABASE TO dup_db FROM ACTIVE DATABASE; What is a prerequisite for the successful execution of this command

A. Flashback must be enabled for the PROD database.B. RMAN must be connected to the target database instance and the auxiliary instance.C. A most recent backup set of the PROD database must exist.D. The target database must be in MOUNT state.

Answer: B

 

NEW QUESTION 26
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