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What is the benefit of running the catctl.pl script during an upgrade of a pre-12c database to an Oracle 12c
database?

A.
It provides a summary of the upgrade results.

B.
It recompiles all invalid PL/SQL and Java code.

C.
It generates a log file containing the fixes that can be made to the source database.

D.
It provides parallel upgrade options to finish the upgrade process with a reduced down time.

E.
It generates fix-up scripts to be run on the source database before upgrade.

Explanation:
https://docs.oracle.com/database/121/UPGRD/upgrade.htm#UPGRD52860

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