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Which three are true concerning Exadata snapshot databases?
A. They are supported on non-container databases.
B. They are based on a read-write copy of an existing database.
C. They are integrated with the Multitenant architecture.
D. They can be created only on sparse ASM disk groups.
E. They don’t support all Exadata features.
F. They can be created on any type of ASM disk group.
Correct Answer: ACD
Explanation/Reference:
A: An Exadata snapshot database can be either a non-container database (non-CDB) or a container database (CDB). Creating an Exadata snapshot database of a CDB enables access to all of the pluggable databases in that container.
C: You can create two types of Exadata snapshots, depending on the current setup of your environment:
You have a pluggable database (PDB) and want to create a test master from it.
You have a container database (CDB) and want to create test masters from all its PDBs, or you have a simple non-container database and want to create a test master from it.
D: SPARSE disk group based database snapshots is functionality included in Exadata Storage Software. It requires Exadata Storage Software version 12.1.2.1.0 and Oracle Database 12c version 12.1.0.2 with bundle patch 5 or later. This feature is designed to work on native Exadata ASM storage disk groups. It uses ASM SPARSE grid disk based thin provisioning where snapshot databases created on a SPARSE disk group need only the space for changes plus some metadata, thereby enabling storage efficient snapshot databases.
References: http://docs.oracle.com/cd/E80920_01/SAGUG/exadata-storage-server-snapshots.htm#SAGUG-GUID-E1D6EF45-36EF-40E3-A57E-F80B749E6122
http://www.oracle.com/technetwork/database/exadata/learnmore/exadata-database-copy-twp-2543083.pdf
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