The correct answer: Data independence
Data independence<span> is the type of </span>data<span> transparency that matters for a centralised DBMS. It refers to the immunity of user applications to changes made in the definition and organization of </span>data<span>. Physical </span>data independence<span> deals with hiding the details of the storage structure from user applications.
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The logical<span> structure of the data is known as the 'schema definition'. In general, if a user application operates on a subset of the </span>attributes<span> of a </span>relation<span>, it should not be affected later when new attributes are added to the same relation. Logical data independence indicates that the conceptual schema can be changed without affecting the existing schemas.
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<span>The physical structure of the data is referred to as "physical data description". Physical data independence deals with hiding the details of the storage structure from user applications. The application should not be involved with these issues since, conceptually, there is no difference in the operations carried out against the data.</span>
The <em><u>sound energy into electric energy and then into radiant energy.</u></em>
<em>[That's it]:)</em>
Rest your fingers gently on the home row or home keys.
Rest your palms on the keyboard.
Relax your fingers.
All the above are proper keyboard techniques apart from slouch in your chair. It is always recommended to sit up straight with your feet positioned on the floor for balance. Do not cross. Center your body to the H key and have your elbows at sides and bent about 90 degrees. Use correct fingering and deploy touch typing. These and many others will help develop optimal speed and accuracy and help prevent the development of stress injury.
There are three tunneling protocols. They are ISATAP, <span>teredo and 6TO4</span><span />
