21.10 Troubleshooting the ORA-12516, TNS: listener could not find available handler with matching protocol stack

The TNS: listener could not find available handler with matching protocol stack error appears, when you are migrating MS SQL to Oracle database.

To troubleshoot this scenario, increase the oracle processes by using the below SQL statement and bounce the database to reflect the changes.

SQL> alter system set processes=500 scope=spfile