Disabling redo generation (NOLOGGING)
The NOLOGGING attribute tells Oracle that the operation being performed does not need to be recoverable in the event of a failure. In this case, the database will generate only a small set of metadata that is written to the redo log, and the operation will probably run faster. Oracle is relying on the user to recover the data manually in the event of any failure. In other words, the NOLOGGING option skips the generation of redo for the affected object, but will still log many things such as data dictionary changes caused by space management.
NOLOGGING operations
At the tablespace level, the LOGGING clause specifies the default LOGGING attribute for all tables, indexes, and partitions created in the tablespace ...
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