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* '''W(X):''' The corresponding transaction "writes" to object X (i.e., it modifies the data stored at X). When the schedule is represented as a list rather than a grid, the action is represented as <math>Wi(X) </math> where <math>i</math> is a number corresponding to a specific transaction.
* '''Com.:''' This represents a "commit" operation in which the corresponding transaction has successfully completed its preceding actions, and has made all its changes permanent in the database.
Alternatively,
==== Example ====
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