Query for Client Errors
You can
                query for database client errors using v$client_errors to search
                for alert log related error data.
               
V$CLIENT_ERRORS shows the contents of the XML-based error log. For
                        example, if you want to search for errors related to client connection
                        tracing, you can query V$CLIENT_ERRORS. Also you can query
                                V$CLIENT_ERRORS if you want to pull the data from
                        these logs to another analytic solution for tracing errors. For example, if
                        you want to search for user errors, such as ORA-4021, you
                        can query V$CLIENT_ERRORS.
               
See V$CLIENT_ERRORS View for more information.
Parent topic: Notes for Users Migrating from Other Oracle Databases