What is the benefit of running the catctl.pl script during an upgrade of a pre-12c database to an Oracle 12c
It provides a summary of the upgrade results.
It recompiles all invalid PL/SQL and Java code.
It generates a log file containing the fixes that can be made to the source database.
It provides parallel upgrade options to finish the upgrade process with a reduced down time.
It generates fix-up scripts to be run on the source database before upgrade.