One important log function of the Loader is storing Loader-relevant information in system tables.
When you install the database system, the following system tables are created for the Loader:
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The owner of these system tables is the SYSDBA user. You do not need to specify the owner when you access these tables.
The Loader logs information on the runtime responses of unload and load processes in the TRANSFORMATION system tables. If you perform a load or unload process that spans multiple tables, the system tables are filled with the corresponding information.
You can also configure a transformation using the system tables.
The Loader uses the entries in the system tables to restart commands. You can use this ability to restart by using the RESTART option (restart) of the command.