Why in 12c there is only one container but In 19.10 there 5 containers?
12c
CON_NAME
------------------------------
TAG12GP2
SQL> select PDB from v$services;
PDB
------------------------------
6 rows selected.
SQL>
19.10
CON_NAME
------------------------------
CDB$ROOT
SQL> select PDB from v$services;
PDB
--------------------------------------------------------------------------------
ST19STAGE3A
CDB$ROOT
CDB$ROOT
CDB$ROOT
CDB$ROOT