Recently, I undertook the task of upgrading an Oracle database from version 19.10 to 19.18. As the process progressed, I began to encounter a series of errors that were consistently appearing in the alert log. After diving deep into the issue, it was discovered that running a series of scripts after the upgrade would effectively solve the problem. Furthermore, it was necessary to recompile the invalid packages. Without any delay, I proceeded to execute the specified scripts and recompile the invalid objects. And voila, problem solved! I hope this post…