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Keeping data in a temporary table is more efficient than placing this data in a permanent table.

This is primarily due to less redo activity when a session is applying DML to temporary tables. DML statements on temporary tables do not generate redo logs for the data changes. However, undo logs for the data and redo logs for the undo logs are generated.

Oracle writes data for temporary tables into temporary segments and thus doesn’t require redo log entries. Oracle writes rollback data for the temporary table into the rollback segments (also known as the undo log). Even though redo log generation for temporary tables will be lower than permanent tables, it’s not entirely eliminated because Oracle must log the changes made to these rollback segments.

To summarize – “log generation should be approximately half of the log generation (or less) for permanent tables.”
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