Oracle 19c - CDB / PDB - useful sqls 

sqlplus / as sysdba

set lines 200

COL name FORMAT A30

col CON_ID form 999999

col OPEN_TIME FORMAT a40

col pdb form a30

COLUMN pdb_name FORMAT A20

SELECT con_id, name, open_mode, restricted, open_time  FROM gv$containers;

SELECT name, cdb, open_mode                     FROM   v$database;

SELECT name, pdb                                FROM   v$services  ORDER BY name;

select PDB_ID,PDB_NAME,CON_ID,STATUS,LOGGING,FORCE_LOGGING from dba_pdbs ORDER BY pdb_name;

SELECT con_id, name, open_mode, restricted      FROM   v$pdbs ORDER BY name;

select inst_id, con_id, name, recovery_status, open_mode from gv$pdbs

# the end