· It doesn't work in a distance, thus requiring close contact to the reader
· Data can be damaged by stray magnetic fields
· Since it's not in human readable form can be a disadvantage in some applications
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problems associated with redundancy in data base,Redundancy occurs in same data multiple time tends to several problems some times redundancy controlling is necessary to improve the performance of the query.
There is no single method to solve all types of fraction problems. Some problems and their solutions are relatively simple, others are extremely difficult.
1. You might miss spell something 2. One might record some data incorrectly 3. One might use the incorrect vocabulary
Some common ways that people can protect their personal data include shredding or burning any old documents that contain personal details, and password protecting any information they have on their computer or other storage devices.
some sources of data are information