Transactions and Logging
Changes made to a database may be logged, to provide back-up protection in the event of hardware failure, provided that the changes occur within a transaction and that the databanks involved have the LOG option. Transaction handling is, therefore, important even in standalone environments where concurrency control issues do not arise.
Transaction control and logging is determined at the databank level by options set when the databank is defined.
The options are:
All operations on the databank are performed without transaction control (even if they are requested within a transaction), and are not logged. Sets of operations (DELETE, UPDATE or INSERT on several rows) which are interrupted will not be rolled back.
Note: All important databanks should be defined with LOG option, so that valuable data is not lost by any system failure.
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