1Z1-060 Latest Exam Braindumps
Question 15: What is the effect of specifying the "ENABLE PLUGGABLE DATABASE" clause in a "CREATEDATABASE" statement?
A. It will create a CDB that must be plugged into an existing CDB.
B. It will create a CDB with root opened and seed mounted.
C. It will create a CDB with root and seed opened and one PDB mounted.
D. It will create a CDB with root opened and seed read only.
E. It will create a multitenant container database (CDB) with only the root opened.
Correct Answer: D
Explanation
* The CREATE DATABASE ... ENABLE PLUGGABLE DATABASE SQL statement creates a new CDB. If you
do not specify the ENABLE PLUGGABLE DATABASE clause, then the newly created database is a non-
CDB and can never contain PDBs.
Along with the root (CDB$ROOT), Oracle Database automatically creates a seed PDB (PDB$SEED). The
following graphic shows a newly created CDB:
* Creating a PDB
Rather than constructing the data dictionary tables that define an empty PDB from scratch, and then
populating its Obj$ and Dependency $ tables, the empty PDB is created when the CDB is created.
(Here, we use empty to mean containing no customer-created artifacts.) It is referred to as the seed
PDB and has the name PDB $Seed. Every CDB non-negotiably contains a seed PDB; it is non-negotiably
always open in read-only mode. This has no conceptual significance; rather, it is just an optimization
device. The create PDB operation is implemented as a special case of the clone PDB operation.
