oracle 12c 在cdb級別開啓閃回，pdb是否受影響

如下實驗測試在cdb級別開啓數據庫閃回，pdb級別是否也會開啓？
SQL> show con_name;

CON_NAME

CDB$ROOT
SQL> select FLASHBACK_ON from v$database;

FLASHBACK_ON

YES

SQL> show pdbs;

CON_ID CON_NAME OPEN MODE RESTRICTED

2 PDB$SEED READ ONLY NO
3 RACDB1PDB MOUNTED
SQL> alter pluggable database racdb1pdb open;

Pluggable database altered.

SQL> alter session set container=racdb1pdb;

Session altered.

SQL> select FLASHBACK_ON from v$database;

FLASHBACK_ON

YES

SQL>

總結：在cdb級別開啓數據庫閃回，pdb級別也會開啓。