https://skillbuilders.com/oracle-multitenant-architecture-is-here-to-stay/
Oracle Multitenant Architecture Is Here To Stay! - SkillBuilders
Jan 19, 2023 - Oracle Multitenant Architecture is the only way to go in version 21c. Are you ready for it? With version 12c the traditional, non-CDB architecture was...
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https://docs.oracle.com/en/database/oracle/oracle-database/19/upgrd/manual-upgrade-scenarios-multitenant-architecture-oracle-databases.html
Manual Upgrade Scenarios for Multitenant Architecture Oracle Databases
To prepare for manual upgrades, review the manual upgrade scenarios and procedures for Oracle Database deployed with multitenant architecture.
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