1. PDB1 and PDB2 are pluggable databases in CDB1
   Examine these commands
   $export ORACLE_SID-CDB1
   $sqlplus / as sysdba
   SQL > STARTUP
   SQL> SHOW PDBS
   SQL> ALTER PLUGGABLE DATABASE pdb1 OPEN;
   SQL> ALTER PLUGGABLE DATABASE pdb1 save state;
   SQL> ALTER PLUGGABLE DATABASE pdb1 close;
   SQL> ALTER PLUGGABLE DATABASE pdb2 OPEN;
   CDB1 is then restarted

Which three are true（）?
A、PDB2 will be opened READ WRITE
B、PDB2 will be MOUNTED
C、PDB$SEED will be opened READ ONLY
D、PDB1 will be opened READ WRITE
E、PDB$SEED will be MOUNTED
F、PDB1 will be MOUNED.

答案:BCDhttp://www.cndba.cn/hbhe0316/article/108644http://www.cndba.cn/hbhe0316/article/108644http://www.cndba.cn/hbhe0316/article/108644http://www.cndba.cn/hbhe0316/article/108644

SQL> startup
ORACLE instance started.

Total System Global Area 2516581456 bytes
Fixed Size                  9141328 bytes
Variable Size             553648128 bytes
Database Buffers         1946157056 bytes
Redo Buffers                7634944 bytes
Database mounted.
Database opened.
SQL> show pdbs;

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
         3 PDB01                          MOUNTED

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