CS614-Midterm
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30.Data Warehouse is about taking / colleting data from different ________ sources:
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Data Warehouse provides the best support for analysis while OLAP carries out the _________ task.
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For a DWH project, the key requirement are ________ and product experience.
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_________ breaks a table into multiple tables based upon common column values.
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The goal of star schema design is to simplify ________
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Normalization effects performance
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To identify the __________________ required we need to perform data profiling
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If someone told you that he had a good model to predict customer usage, the first thing you might try would be to ask him to apply his model to your customer _______, where you already knew the answer.
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Taken jointly, the extract programs or naturally evolving systems formed a spider web, also known as
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The Kimball s iterative data warehouse development approach drew on decades of experience to develop the _________.
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Multidimensional databases typically use proprietary __________ format to store pre-summarized cube structures.
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_____modeling technique is more appropriate for data warehouses.
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Rearranging the grouping of source data, delivering it to the destination database, and ensuring the quality of data are crucial to the process of loading the data warehouse. Data ____________ is vitally important to the overall health of a warehouse project. 1. Cleansing 2. Cleaning 3. Scrubbing Which of the following options is true?
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_____ contributes to an under-utilization of valuable and expensive historical data, and inevitably results in a limitedcapability to provide decision support and analysis.
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If w is the window size and n is the size of data set, then the complexity of merging phase in BSN method is___________
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NUMA stands for __________
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Horizontal splitting breaks a table into multiple tables based upon_______
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in agriculture extension is that pest population beyond which the benefit of spraying outweighs levels
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The technique that is used to perform these feats in data mining modeling, and this act of model building is something that people have been doing for long time, certainly before the _______ of computers or data mining technology.
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In _________ system, the contents change with time. :
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There are many variants of the traditional nested-loop join. If the index is built as part of the query plan and subsequently dropped, it is called
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The _________ is only a small part in realizing the true business value buried within the mountain of data collected and stored within organizations business systems and operational databases.
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Ad-hoc access means to run such queries which are known already.
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Multi-dimensional databases (MDDs) typically use ___________ formats to store pre-summarized cube structures.
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When performing objective assessments, companies follow a set of principles to develop metrics specific to their needs, there is hard to have “one size fits all” approach. Which of the following statement represents the pervasive functional forms?
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Grain is the ________ level of data stored in the warehouse.
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: The goal of ___________ is to look at as few blocks as possible to find the matching records(s).
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The automated, prospective analyses offered by data mining move beyond the analyses of past events provided by _____________ tools typical of decision support systems.
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____________ in agriculture extension is that pest population beyond which the benefit of spraying outweighs its cost.
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Execution can be completed successfully or it may be stopped due to some error. In case of successful completion of execution all the transactions will be ___________
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During the application specification activity, we also must give consideration to the organization of the applications.
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Data mining evolve as a mechanism to cater the limitations of ________ systems to deal massive data sets with high dimensionality, new data types, multiple heterogeneous data resources etc.
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The goal of ideal parallel execution is to completely parallelize those parts of a computation that are not constrained by data dependencies. The smaller the portion of the program that must be executed __________, the greater the scalability of the computation.
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De-Normalization normally speeds up
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The divide & conquer cube partitioning approach helps alleviate the ____________ limitations of MOLAP implementation.
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Node of a B-Tree is stored in memory block and traversing a B-Tree involves ______ page faults.
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Non uniform distribution, when the data is distributed across the processors, is called ______.
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Data mining is a/an __________ approach, where browsing through data using data mining techniques may reveal something that might be of interest to the user as information that was unknown previously.
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Change Data Capture is one of the challenging technical issues in _____________
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________ gives total view of an organization
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Focusing on data warehouse delivery only often end up _________.
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_______________, if fits into memory, costs only one disk I/O access to locate a record by given key.
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People that design and build the data warehouse must be capable of working across the organization at all levels
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The growth of master files and magnetic tapes exploded around the mid- _______. :
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Slice and Dice is changing the view of the data.
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To measure or quantify the similarity or dissimilarity, different techniques are available. Which of the following option represent the name of available techniques?
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Pre-join technique is used to avoid
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