CS614 Midterm Online Quiz

The STAR schema used for data design is a __________ consisting of fact and dimension tables. :

Normalization effects performance

_____ contributes to an under-utilization of valuable and expensive historical data, and inevitably results in a limitedcapability to provide decision support and analysis.

DOLAP allows download of “cube” structures to a desktop platform with the need for shared relational or cube server.

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.

People that design and build the data warehouse must be capable of working across the organization at all levels

Node of a B-Tree is stored in memory block and traversing a B-Tree involves ______ page faults.

.______ is class of Decision Support Environment.

Pakistan is one of the five major ________ countries in the world.

: An optimized structure which is built primarily for retrieval, with update being only a secondary consideration is

A single database, couldn‟t serve both operational high performance transaction processing and DSS, analytical processing, all at the same time.

Transactional fact tables do not have records for events that do not occur. These are called

There are many variants of the traditional nested-loop join, if there is an index is exploited, then it is called……

In horizontal splitting, we split a relation into multiple tables on the basis of

Many data warehouse project teams waste enormous amounts of time searching in vain for a _______.

Multidimensional databases typically use proprietary __________ format to store pre-summarized cube structures.

Virtual cube is used to query two similar cubes by creating a third “virtual” cube by a join between two cubes.

If every key in the data file is represented in the index file then index is :

The divide & conquer cube partitioning approach helps alleviate the ____________ limitations of MOLAP implementation.

Focusing on data warehouse delivery only often end up _________.

It is observed that every year the amount of data recorded in anorganization is

_______________, if fits into memory, costs only one disk I/O access to locate a record by given key.

The automated, prospective analyses offered by data mining move beyond the analysis of past events provided by respective tools typical of ___________.

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.

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 ___________

Non uniform distribution, when the data is distributed across the processors, is called ______.

Pakistan is one of the five major ________ countries in the world.

The need to synchronize data upon update is called

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.

: The goal of ___________ is to look at as few blocks as possible to find the matching records(s).

All data is ______________ of something real. I An Abstraction II A Representation Which of the following option is true?

For a given data set, to get a global view in un-supervised learning we use

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.

_________ breaks a table into multiple tables based upon common column values.

During the application specification activity, we also must give consideration to the organization of the applications.

____________ in agriculture extension is that pest population beyond which the benefit of spraying outweighs its cost.

The performance in a MOLAP cube comes from the O(1) look-up time for the array data structure.

Change Data Capture is one of the challenging technical issues in _____________

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.

In DWH project, it is assured that ___________ environment is similar to the production environment

The degree of similarity between two records, often measured by a numerical value between _______, usually depends on application characteristics.

_________ breaks a table into multiple tables based upon common column values.

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.

The input to the data warehouse can come from OLTP or transactional system but not from other third party database.

In a traditional MIS system, there is an almost linear sequence of queries.

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?

Data Warehouse provides the best support for analysis while OLAP carries out the _________ task.

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.

Naturally Evolving architecture occurred when an organization had a _______ approach to handling the whole process of hardware and software architecture.

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.