The DOWNTIME_STEPS procedure calls all the other required procedures, in the order they should be executed, to upgrade the inuser schema.
This procedure executes the following procedures in the following order: IN_DB_UTIL.GET_DB_CONNECTIONS, IN_DB_UTIL.GET_DB_CONNECTIONS_COUNT, SCHEMA_UPGRADE_7500_7700, SCHEMA_UPGRADE_7700_7900, IN_DB_UTIL.PRINT_SCHEMA_HIST.