1Z0-497 practice question 20 of 25

Which two statements about multitenant architecture are true?

Answer options

A: Multiple PDBs on a single server need multiple database instances and multiple sets of database files.

B: Although consolidated into a single physical database, PDBs mimic the behavior of non-CDBs.

C: A PDB administrator can use Oracle Flashback or point-in-time recovery to retrieve lost data from a PDB, only by shutting down all the PDBs from the CDB.

D: It is easier to collect performance metrics for many databases in a CDB than individual non-CDB databases.

E: It takes more time to apply a patch to one CDB that holds hundreds of PDBs than to hundreds of non-CDB databases.

Correct Answer:

Explanation

B: A PDB is a portable collection of schemas, schema objects, and nonschema objects that appears to an Oracle Net client as a non-CDB. All Oracle databases before Oracle Database 12c were non-CDBs. D: Ease of performance tuning It is easier to collect performance metrics for a single database than for multiple databases. It is easier to size one SGA than 100 SGAs.
Explanation:
Reference: Benefits of the Multitenant Architecture for Database Consolidation URL: http://docs.oracle.com/cd/E16655_01/server.121/e17633/cdbovrvw.htm#CNCPT89239

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