CS614-Midterm
1 / 50
Multidimensional databases typically use proprietary __________ format to store pre-summarized cube structures.
2 / 50
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 ___________
3 / 50
Suppose the amount of data recorded in an organization is doubled every year. This increase is __________ .
4 / 50
For a given data set, to get a global view in un-supervised learning we use
5 / 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.
6 / 50
Analytical processing uses ____________ , instead of record level access.
7 / 50
Cube is a __________ entity containing values of a certain fact at a certain aggregation level at an intersection of a combination of dimensions.
8 / 50
Ad-hoc access means to run such queries which are known already.
9 / 50
The degree of similarity between two records, often measured by a numerical value between _______, usually depends on application characteristics.
10 / 50
In _________ system, the contents change with time. :
11 / 50
DOLAP allows download of “cube” structures to a desktop platform with the need for shared relational or cube server.
12 / 50
A dense index, if fits into memory, costs only ______ disk I/O access to locate a record by given key.
13 / 50
The need to synchronize data upon update is called
14 / 50
_______________, if fits into memory, costs only one disk I/O access to locate a record by given key.
15 / 50
Slice and Dice is changing the view of the data.
16 / 50
Many data warehouse project teams waste enormous amounts of time searching in vain for a _______.
17 / 50
As apposed to the out come of classification, estimation deal with ____________ valued outcome.
18 / 50
DSS queries do not involve a primary key
19 / 50
_________ breaks a table into multiple tables based upon common column values.
20 / 50
A data warehouse implementation without an OLAP tool is always possible.
21 / 50
in agriculture extension is that pest population beyond which the benefit of spraying outweighs levels
22 / 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.
23 / 50
To judge effectiveness we perform data profiling twice.
24 / 50
_____________, if fits into memory , costs only one disk I/O access to locate a record by given key.
25 / 50
Virtual cube is used to query two similar cubes by creating a third “virtual” cube by a join between two cubes.
26 / 50
Naturally Evolving architecture occurred when an organization had a _______ approach to handling the whole process of hardware and software architecture.
27 / 50
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.
28 / 50
29 / 50
________ gives total view of an organization
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Data mining derives its name from the similarities between searching for valuable business information in a large database, for example, finding linked products in gigabytes of store scanner data, and mining a mountain for a _________ of valuable ore.
31 / 50
NUMA stands for __________
32 / 50
30.Data Warehouse is about taking / colleting data from different ________ sources:
33 / 50
De-Normalization normally speeds up
34 / 50
For a relation to be in 4NF it must be:-
35 / 50
5 million bales.
36 / 50
To measure or quantify the similarity or dissimilarity, different techniques are available. Which of the following option represent the name of available techniques?
37 / 50
Taken jointly, the extract programs or naturally evolving systems formed a spider web, also known as
38 / 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...
39 / 50
_______________, if too big and does not fit into memory, will be expensive when used to find a record by given key.
40 / 50
Normalization effects performance
41 / 50
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?
42 / 50
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.
43 / 50
In horizontal splitting, we split a relation into multiple tables on the basis of
44 / 50
The purpose of the House of Quality technique is to reduce ______ types of risk.
45 / 50
If every key in the data file is represented in the index file then index is :
46 / 50
People that design and build the data warehouse must be capable of working across the organization at all levels
47 / 50
The input to the data warehouse can come from OLTP or transactional system but not from other third party database.
48 / 50
____________ in agriculture extension is that pest population beyond which the benefit of spraying outweighs its cost.
49 / 50
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?
50 / 50
For a DWH project, the key requirement are ________ and product experience.
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