About Dbupgrade Scripts and catupgrd.sql in Earlier ...
The function of the catupgrd.sql script is replaced by the Parallel Upgrade Utility, catctl.pl, and the dbupgrade and dbupgrade.cmd scripts.. In earlier releases of Oracle Database, the catupgrd.sql Upgrade Utility processed the upgrade. Starting with Oracle Database 12c release 1 (12.1), this script is replaced by the catctl.pl Parallel Upgrade Utility, and its command-line script, dbupgrade.
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