CS614-Midterm
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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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Naturally Evolving architecture occurred when an organization had a _______ approach to handling the whole process of hardware and software architecture.
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Companies collect and record their own operational data, but at the same time they also use reference data obtained from _______ sources such as codes, prices etc.
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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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In horizontal splitting, we split a relation into multiple tables on the basis of
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7 / 50
Non uniform distribution, when the data is distributed across the processors, is called ______.
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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 __________ the portion of the program that must be executed sequentially, the greater the scalability of computation.
9 / 50
DTS allows us to connect through any data source or destination that is supported by ____________
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The divide & conquer cube partitioning approach helps alleviate the ____________ limitations of MOLAP implementation.
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The users of data warehouse are knowledge workers in other words they are _______in the organization.
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Pre-computed _______ can solve performance problems
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It is observed that every year the amount of data recorded in an organization :
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Focusing on data warehouse delivery only often end up _________.
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_____________ is a process which involves gathering of information about column through execution of certain queries with intention to identify erroneous records.
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It is observed that every year the amount of data recorded in anorganization is
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Pakistan is one of the five major ________ countries in the world.
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DSS queries do not involve a primary key
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________ is the technique in which existing heterogeneous segments are reshuffled, relocated into homogeneous segments.
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Suppose the amount of data recorded in an organization is doubled every year. This increase is __________ .
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During the application specification activity, we also must give consideration to the organization of the applications.
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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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25 / 50
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.
26 / 50
We must try to find the one access tool that will handle all the needs of their users.
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De-Normalization normally speeds up
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Normalization effects performance
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The degree of similarity between two records, often measured by a numerical value between _______, usually depends on application characteristics.
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To judge effectiveness we perform data profiling twice.
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The need to synchronize data upon update is called
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Data mining uses _________ algorithms to discover patterns and regularities in data.
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B-Tree is used as an index to provide access to records
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A dense index, if fits into memory, costs only ______ 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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Virtual cube is used to query two similar cubes by creating a third “virtual” cube by a join between two cubes.
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Data warehousing and on-line analytical processing (OLAP) are _______ elements of decision support system.
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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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: An optimized structure which is built primarily for retrieval, with update being only a secondary consideration is
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To identify the __________________ required we need to perform data profiling
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NUMA stands for __________
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A ________ dimension is a collection of random transactional codes, flags and/text attributes that are unrelated to any particular dimension. The ______ dimension is simply a structure that provides a convenient place to store the ______ attributes.
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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.
45 / 50
Data Warehouse provides the best support for analysis while OLAP carries out the _________ task.
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The goal of star schema design is to simplify ________
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________ gives total view of an organization
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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.
49 / 50
_________ breaks a table into multiple tables based upon common column values.
50 / 50
The purpose of the House of Quality technique is to reduce ______ types of risk.
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