Question

Explain the undo and redo operations and the recovery techniques that use each

Answer 1

a transaction fails to reach its commit point, the effect of its operation must be undone i.e. the transaction must be rolled back hence we require both undo and redo. This technique is known as undo/redo algorithm. ... When a transaction began executing the current directory is copied into a shadow directory

Answer 2

Answer:  Frankly speaking undo and redo operations are useful features that allow users to reverse and redo their actions within an application. Recovery techniques that use these operations can help users recover lost or damaged data or restore system settings to their original state

Explanation: Undo and redo operations are common features found in many software applications. . Let us look at an explanation of undo and redo operations, as well as the recovery techniques that use each.

Undo Operations:

Firstly an undo operation is a command that allows a user to reverse their most recent action. This feature is particularly useful when a user makes an error and needs to correct it. The undo operation is usually triggered by a keyboard shortcut (such as Ctrl+Z on Windows or Command+Z on Mac) or by selecting the undo option from the application's Edit menu.

Recovery Techniques using Undo:

When a user accidentally deletes a file, an undo operation can be used to restore the deleted file. Similarly, when a user accidentally overwrites a file, an undo operation can be used to revert the changes and recover the original file. In addition, some applications have an auto-save feature that automatically saves a copy of the document after every few minutes, which can be used to recover an older version of the document in case of data loss.

Redo Operations:

Luckily,a redo operation is the opposite of an undo operation. It allows a user to redo an action that they previously undid using the undo operation. This feature is particularly useful when a user undoes an action by mistake and wants to restore it. The redo operation is usually triggered by a keyboard shortcut (such as Ctrl+Y on Windows or Command+Shift+Z on Mac) or by selecting the redo option from the application's Edit menu.

Recovery Techniques using Redo:

Redo operations are not typically used for data recovery. Instead, recovery techniques that involve the use of redo operations are focused on recovering system settings or configurations. For example, if a user accidentally changes a system setting that causes a problem, a redo operation can be used to restore the setting to its original state.

Learn more about UNDO and REDO command: https://brainly.in/question/18187133

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