Data Anomaly are the logical or structural in database.For example, if we have a multiple instances of same information in a table, it may happen that the data is not consistent after operations like update. This may result in the loss od data integrity.
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I try to answer as simple as people can understand. Island Of Information means the same data (such scattered data locations) separated at the different places. Data Anomaly caused by Island Of Information. We can say that Data Anomaly is something wrong with the data or information. Some examples are Modification Anomalies(data cannot be deleted), Insertion Anomalies(data cannot be inserted) and Deletion Anomalies(data cannot be deleted).
Anomalies is the plural of the noun anomaly.
The extra leg on this baboon was quite an anomaly. The spring snowstorm was an anomaly that could not be explained.
abnormality
No; although it ends in -LY, it is a noun. An anomaly is a deviation or abnormality from what is considered normal or expected. The adjective form is anomalous.