The Library is currently in the process of being upgraded from Oracle Database Version 22.214.171.124 to 126.96.36.199.
Demos are being upgraded to reflect the new Container paradigm as well as EBR (Edition Based Redefinition) and may contain references to CDBs, PDBs,
and other objects you may not be familiar with such as CDB_OBJECTS_AE: Welcome to 12c.
Do you remember when mainframes were replaced by client-server? When
client-server was replaced by n-tier architecture? The "Cloud" is a
distraction ... DevOps is not. Prepare for the future.