CS614-Midterm
1 / 50
The need to synchronize data upon update is called
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For good decision making, data should be integrated across the organization to cross the LoB (Line of Business). This is to give the total view of organization from:
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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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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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The automated, prospective analyses offered by data mining move beyond the analyses of past events provided by _____________ tools typical of decision support systems.
6 / 50
DSS queries do not involve a primary key
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With data mining, the best way to accomplish this is by setting aside some of your data in a vault to isolate it from the mining process; once the mining is complete, the results can be tested against the isolated data to confirm the model's _______.
8 / 50
Multidimensional databases typically use proprietary __________ format to store pre-summarized cube structures.
9 / 50
.______ is class of Decision Support Environment.
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________ is the technique in which existing heterogeneous segments are reshuffled, relocated into homogeneous segments.
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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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Pre-join technique is used to avoid
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If some error occurs, execution will be terminated abnormally and all transactions will be rolled back. In this case when we will access the database we will find it in the state that was before the ____________.
14 / 50
Relational databases allow you to navigate the data in ____________ that is appropriate using the primary, foreign key structure within the data model.
15 / 50
People that design and build the data warehouse must be capable of working across the organization at all levels
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The Kimball s iterative data warehouse development approach drew on decades of experience to develop the _________.
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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.
18 / 50
Which statement is true for De-Normalization?
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____________ in agriculture extension is that pest population beyond which the benefit of spraying outweighs its cost.
20 / 50
The input to the data warehouse can come from OLTP or transactional system but not from other third party database.
21 / 50
For a relation to be in 4NF it must be:-
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The growth of master files and magnetic tapes exploded around the mid- _______. :
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Collapsing tables can be done on the ___________ relationships
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Pakistan is one of the five major ________ countries in the world.
25 / 50
Analytical processing uses ____________ , instead of record level access.
26 / 50
The purpose of the House of Quality technique is to reduce ______ types of risk.
27 / 50
The STAR schema used for data design is a __________ consisting of fact and dimension tables. :
28 / 50
NUMA stands for __________
29 / 50
Data mining uses _________ algorithms to discover patterns and regularities in data.
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_________ breaks a table into multiple tables based upon common column values.
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_______________, if too big and does not fit into memory, will be expensive when used to find a record by given key.
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Pipeline parallelism focuses on increasing throughput of task execution, NOT on __________ sub-task execution time.
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Cube is a __________ entity containing values of a certain fact at a certain aggregation level at an intersection of a combination of dimensions.
34 / 50
In horizontal splitting, we split a relation into multiple tables on the basis of
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Horizontal splitting breaks a table into multiple tables based upon_______
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DTS allows us to connect through any data source or destination that is supported by ____________
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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.
40 / 50
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Pre-computed _______ can solve performance problems
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43 / 50
Slice and Dice is changing the view of the data.
44 / 50
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.
45 / 50
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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If every key in the data file is represented in the index file then index is :
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Investing years in architecture and forgetting the primary purpose of solving business problems, results in inefficient application. This is the example of _________ mistake.
48 / 50
30.Data Warehouse is about taking / colleting data from different ________ sources:
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It is observed that every year the amount of data recorded in an organization :
50 / 50
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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