CS614-Midterm
1 / 50
Ad-hoc access means to run such queries which are known already.
2 / 50
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...
3 / 50
5 million bales.
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De-Normalization normally speeds up
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_________ breaks a table into multiple tables based upon common column values.
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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.
7 / 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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NUMA stands for __________
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Transactional fact tables do not have records for events that do not occur. These are called
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Pakistan is one of the five major ________ countries in the world.
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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___________
12 / 50
The automated, prospective analyses offered by data mining move beyond the analysis of past events provided by respective tools typical of ___________.
13 / 50
There are many variants of the traditional nested-loop join, if there is an index is exploited, then it is called……
14 / 50
Analytical processing uses ____________ , instead of record level access.
15 / 50
The goal of ______is to look at as few block as possible to find the matching records.
16 / 50
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:
17 / 50
A single database, couldn‟t serve both operational high performance transaction processing and DSS, analytical processing, all at the same time.
18 / 50
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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Cube is a __________ entity containing values of a certain fact at a certain aggregation level at an intersection of a combination of dimensions.
20 / 50
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.
21 / 50
Change Data Capture is one of the challenging technical issues in _____________
22 / 50
Pipeline parallelism focuses on increasing throughput of task execution, NOT on __________ sub-task execution time.
23 / 50
Multidimensional databases typically use proprietary __________ format to store pre-summarized cube structures.
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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 users of data warehouse are knowledge workers in other words they are _______in the organization.
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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.
28 / 50
For a DWH project, the key requirement are ________ and product experience.
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In DWH project, it is assured that ___________ environment is similar to the production environment
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It is observed that every year the amount of data recorded in an organization :
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Grain is the ________ level of data stored in the warehouse.
33 / 50
DTS allows us to connect through any data source or destination that is supported by ____________
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Which statement is true for De-Normalization?
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36 / 50
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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.
38 / 50
For a given data set, to get a global view in un-supervised learning we use
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Collapsing tables can be done on the ___________ relationships
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To identify the __________________ required we need to perform data profiling
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____________ in agriculture extension is that pest population beyond which the benefit of spraying outweighs its cost.
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Suppose the amount of data recorded in an organization is doubled every year. This increase is __________ .
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The goal of star schema design is to simplify ________
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The growth of master files and magnetic tapes exploded around the mid- _______. :
45 / 50
To judge effectiveness we perform data profiling twice.
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_____________, if fits into memory , costs only one disk I/O access to locate a record by given key.
47 / 50
The performance in a MOLAP cube comes from the O(1) look-up time for the array data structure.
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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?
49 / 50
_______ is an application of information and data.
50 / 50
Normalization effects performance
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