Why upgrade to 19c Client from 12c or 18c?
Oracle Database Client 19c represents the long-term support release of Oracle’s client connectivity software. While the database engine itself does the heavy lifting of storing and retrieving data, the "Client" is the essential middleman that allows applications, administrators, and developers to communicate with that engine. oracle database client 19c
Even with a perfect install, things can go wrong. Why upgrade to 19c Client from 12c or 18c
If you are installing on Linux (RHEL/CentOS/OL 7 or 8), you must address dependencies: you must address dependencies: