In order for logical logging to work, a logical database operation must have a logical inverse operation. Give an example of a database operation that has no inverse. Suggest a procedure involving logical logging that can handle this case.
What will be an ideal response?
An operation that changes an item x to f (x), where f () is some function with no know n inverse (such as x := 5) is an example. A combination of physical and logical logging can be used. Physical logging is used for operations that have no inverse, logical logging is used for others. Each update record identifies the type of undo/redo that it uses.
Computer Science & Information Technology
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