CS614-Midterm
1 / 50
_____ contributes to an under-utilization of valuable and expensive historical data, and inevitably results in a limitedcapability to provide decision support and analysis.
2 / 50
Taken jointly, the extract programs or naturally evolving systems formed a spider web, also known as
3 / 50
To identify the __________________ required we need to perform data profiling
4 / 50
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.
5 / 50
For a DWH project, the key requirement are ________ and product experience.
6 / 50
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 ____________.
7 / 50
Virtual cube is used to query two similar cubes by creating a third “virtual” cube by a join between two cubes.
8 / 50
To measure or quantify the similarity or dissimilarity, different techniques are available. Which of the following option represent the name of available techniques?
9 / 50
For a given data set, to get a global view in un-supervised learning we use
10 / 50
____________ in agriculture extension is that pest population beyond which the benefit of spraying outweighs its cost.
11 / 50
DTS allows us to connect through any data source or destination that is supported by ____________
12 / 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.
13 / 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?
14 / 50
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.
15 / 50
Pakistan is one of the five major ________ countries in the world.
16 / 50
Analytical processing uses ____________ , instead of record level access.
17 / 50
We must try to find the one access tool that will handle all the needs of their users.
18 / 50
The goal of star schema design is to simplify ________
19 / 50
For a relation to be in 4NF it must be:-
20 / 50
In horizontal splitting, we split a relation into multiple tables on the basis of
21 / 50
In _________ system, the contents change with time. :
22 / 50
Pre-computed _______ can solve performance problems
23 / 50
24 / 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.
25 / 50
Multidimensional databases typically use proprietary __________ format to store pre-summarized cube structures.
26 / 50
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.
27 / 50
Which statement is true for De-Normalization?
28 / 50
Pipeline parallelism focuses on increasing throughput of task execution, NOT on __________ sub-task execution time.
29 / 50
The input to the data warehouse can come from OLTP or transactional system but not from other third party database.
30 / 50
If w is the window size and n is the size of data set, then the complexity of merging phase in BSN method is___________
31 / 50
: The goal of ___________ is to look at as few blocks as possible to find the matching records(s).
32 / 50
The need to synchronize data upon update is called
33 / 50
34 / 50
For a smooth DWH implementation we must be a technologist.
35 / 50
The degree of similarity between two records, often measured by a numerical value between _______, usually depends on application characteristics.
36 / 50
37 / 50
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 _______.
38 / 50
Grain is the ________ level of data stored in the warehouse.
39 / 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.
40 / 50
Transactional fact tables do not have records for events that do not occur. These are called
41 / 50
Non uniform distribution, when the data is distributed across the processors, is called ______.
42 / 50
There are many variants of the traditional nested-loop join, if there is an index is exploited, then it is called……
43 / 50
The purpose of the House of Quality technique is to reduce ______ types of risk.
44 / 50
A single database, couldn‟t serve both operational high performance transaction processing and DSS, analytical processing, all at the same time.
45 / 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.
46 / 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 ___________
47 / 50
________ gives total view of an organization
48 / 50
Focusing on data warehouse delivery only often end up _________.
49 / 50
50 / 50
A dense index, if fits into memory, costs only ______ disk I/O access to locate a record by given key.
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