Data which improves the performance and accessibility of the database are called:
(B) User Data
(C) Application Metadata
(D) Data Dictionary
Explanation: Data which improves the performance and accessibility of the database are called indexes because index is a type of any data which improves the lookup table. Simply we can say that an index is a pointer to data in a table which increases the accessibility in a book or databases, we can easily access any information with the help of index.
Option (A) is correct
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