Which two statements about multitenant architecture are true?
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.
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.