DATABASE FUNDAMENTALS
DATA WAREHOUSING AND DATA MINING
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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TRUE
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FALSE
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Either A or B
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None of the above
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Detailed explanation-1: -MOLAP generally delivers better performance due to specialized indexing and storage optimizations. MOLAP also needs less storage space compared to ROLAP because the specialized storage typically includes compression techniques. ROLAP is generally more scalable.
Detailed explanation-2: -Advantages. MOLAP allows fastest indexing to the pre-computed summarized data. Helps the users connected to a network who need to analyze larger, less-defined data. Easier to use, therefore MOLAP is suitable for inexperienced users.
Detailed explanation-3: -Multidimensional OLAP (MOLAP) is faster than Relational OLAP (ROLAP).
Detailed explanation-4: -What is MOLAP? MOLAP stands for Multidimensional Online Analytical Processing. MOLAP uses a multidimensional cube that accesses stored data through various combinations. Data is pre-computed, pre-summarized, and stored (a difference from ROLAP, where queries are served on-demand).
Detailed explanation-5: -OLAP works by extracting data from multiple sources and formatting it into cubes, which can then be analyzed from multiple points of view. Multiple cubes can be nested, creating multidimensional “hypercubes."