Cramps in your hand can arise from a number of different causes. Hand cramps develop as a result of conditions affecting muscles and nerves in your hand. Trauma or injury to a nerve in your hand can also cause hand cramps. Even breathing too fast (hyperventilation) can result in hand cramps, as carbon dioxide levels in the blood become too low. Everyday, simple reasons, such as fatigue from overuse, can lead to temporary, acute cramps in the hand.
Just like files that you save on the device's internal storage, Android stores your database in private disk space that's associated application. Your data is secure, because by default this area is not accessible to other applications. A useful set of APIs is available in the SQLiteOpenHelper class.
A DB file is a database file used on mobile devices such as Android, iOS, and Windows Phone 7 mobile phones. It is often used to store contacts and SMS information but may store any type of device or application data. DB files are commonly stored in an SQLite database format but may also be locked or encrypted so the user cannot see the data directly.