The operation of moving from finer- granularity data to a coarser granularity (by means of aggregation) is called a                  

Related MCQs

• Once the lower-level lock is released, the operation cannot be undone by using the old values of updated data items, and must instead be undone by executing a compensating operation; such an operation is called
• The granularity of a database item can be chosen to be
• The operation which is not considered a basic operation of relational algebra is
• Whenever an update operation occurs on a page, the operation stores the LSN of its log record in the                field of the page.
• The magnetic storage chip used to provide non-volatile direct access storage of data and that have no moving parts are known as
• The results of each intermediate operation are created and then are used for evaluation of the next-level operations. This is called
•          means that the data used during the execution of a transaction cannot be used by a second transaction until the first one is completed.
•                means that data used during the execution of a transaction cannot be used by a second transaction until the first one is completed.
• Minimal data redundancy means improved _________:
• ____ means that the data used during the execution of a transaction cannot be used by a second transaction until the first one is completed.