Choose the best answer.
Examine this configuration:
1-. CDB1 is a container database.
2-. DEFAULT_SHARING is METADATA.
3-. APP_ROOT is an application root contained in CDB1.
4-. APP_PDB1 is an application PDB contained in APP_ROOT.
5-. COMPANYAPP is an application contained in APP_ROOT.
6-. EMP is a common table created in APP_ROOT and all its application PDBs
Created when version 1.0 of COMPANYAPP was installed.
You execute these commands:
$ sqlplus sys/orac1e@localhost:1521/cdb1 as sysdba
SQL> ALTER SYSTEM SET DEFAULT_SHARING=DATA;
System altered.
SQL> ALTER SESSION SET CONTAINER=app_root;
Session altered.
SQL> ALTER PLUGGABLE DATABASE APPLICATION companyapp BEGIN UPGRADE '1.0' TO
'2.0';
Pluggable database altered.
SQL> ALTER TABLE emp ADD (sal NUMBER NOT NULL) ;
Table altered.
SQL> ALTER PLUGGABLE DATABASE APPLICATION companyapp END UPGRADE TO '2.0';
Pluggable database altered.
SQL> ALTER SESSION SET CONTAINER=app_pdb1;
Session altered.
SQL> DESC emp;
Name Null? Type
--------------------------------------------------------------
ENO
ENAME
SQL> SELECT * FROM emp; ENO ENAME
NUMBER
VARCHAR2 (20)
---------------------------------
100 Alan
200 Ben
SQL> ALTER PLUGGABLE DATABASE APPLICATION companyapp SYNC;
What will be the outcome and why?
A.SAL will be added to APP_PDB1.EMP with 0 in columns of existing rows. B.SAL will be added to APP_PDB1.EMP with NULLs in columns of existing rows. C.It will return an error because the SYNC operation is not allowed when正确答案D
Constraints are added to common objects. D.It will return an error because EMP is not empty in APP_ROOT. E.It will return an error because EMP.SAL is empty in APP_ROOT.
