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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.
Correct Answer: BD
Explanation/Reference:
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.
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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