CS614-Midterm
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Normalization effects performance
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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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The purpose of the House of Quality technique is to reduce ______ types of risk.
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Collapsing tables can be done on the ___________ relationships
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It is observed that every year the amount of data recorded in an organization :
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To judge effectiveness we perform data profiling twice.
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Pakistan is one of the five major ________ countries in the world.
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Data mining is a/an ______ approach , where browsing through data using mining techniques may reveal something that might be of interest to the user as information that was unknown previously.
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Focusing on data warehouse delivery only often end up _________.
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De-Normalization normally speeds up
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For a DWH project, the key requirement are ________ and product experience.
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During ETL process of an organization, suppose you have data which can be transformed using any of the transformation method. Which of the following strategy will be your choice for least complexity?
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Non uniform distribution, when the data is distributed across the processors, is called ______.
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If „M‟ rows from table-A match the conditions in the query then table-B is accessed „M‟ times. Suppose table-B has an index on the join column. If „a‟ I/Os are required to read the data block for each scan and „b‟ I/Os for each data block then the total cost of accessing table-B is _____________ logical I/Os approximately.
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The need to synchronize data upon update is called
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A data warehouse implementation without an OLAP tool is always possible.
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.______ is class of Decision Support Environment.
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Taken jointly, the extract programs or naturally evolving systems formed a spider web, also known as
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Multidimensional databases typically use proprietary __________ format to store pre-summarized cube structures.
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Horizontal splitting breaks a table into multiple tables based upon_______
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: An optimized structure which is built primarily for retrieval, with update being only a secondary consideration is
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________ is the technique in which existing heterogeneous segments are reshuffled, relocated into homogeneous segments.
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The STAR schema used for data design is a __________ consisting of fact and dimension tables. :
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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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DTS allows us to connect through any data source or destination that is supported by ____________
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_________ breaks a table into multiple tables based upon common column values.
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All data is ______________ of something real. I An Abstraction II A Representation Which of the following option is true?
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The key idea behind ___________ is to take a big task and break it into subtasks that can be processed concurrently on a stream of data inputs in multiple, overlapping stages of execution.
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Multi-dimensional databases (MDDs) typically use ___________ formats to store pre-summarized cube structures.
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Pipeline parallelism focuses on increasing throughput of task execution, NOT on __________ sub-task execution time.
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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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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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NUMA stands for __________
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The growth of master files and magnetic tapes exploded around the mid- _______. :
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During the application specification activity, we also must give consideration to the organization of the applications.
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DOLAP allows download of “cube” structures to a desktop platform with the need for shared relational or cube server.
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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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Data Transformation Services (DTS) provide a set of _____ that lets you extract, transform, and consolidate data from disparate sources into single or multiple destinations supported by DTS connectivity.
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Pre-join technique is used to avoid
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in agriculture extension is that pest population beyond which the benefit of spraying outweighs levels
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Change Data Capture is one of the challenging technical issues in _____________
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Pre-computed _______ can solve performance problems
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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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Data mining evolve as 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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Data Warehouse provides the best support for analysis while OLAP carries out the _________ task.
50 / 50
Investing years in architecture and forgetting the primary purpose of solving business problems, results in inefficient application. This is the example of _________ mistake.
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