CS614 Midterm Online Quiz

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.

To measure or quantify the similarity or dissimilarity, different techniques are available. Which of the following option represent the name of available techniques?

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

Which statement is true for De-Normalization?

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

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.

For a relation to be in 4NF it must be:-

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

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

For a DWH project, the key requirement are ________ and product experience.

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...

If w is the window size and n is the size of data set, then the complexity of merging phase in BSN method is___________

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

A data warehouse implementation without an OLAP tool is always possible.

The goal of ______is to look at as few block as possible to find the matching records.

_______ is an application of information and data.

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

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.

_______________, if too big and does not fit into memory, will be expensive when used to find a record by given key.

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

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

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.

Pre-computed _______ can solve performance problems

Data mining uses _________ algorithms to discover patterns and regularities in data.

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

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 _______.

in agriculture extension is that pest population beyond which the benefit of spraying outweighs levels

The purpose of the House of Quality technique is to reduce ______ types of risk.

Pre-join technique is used to avoid

The users of data warehouse are knowledge workers in other words they are _______in the organization.

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

 ________ gives total view of an organization

Data warehousing and on-line analytical processing (OLAP) are _______ elements of decision support system.

There are many variants of the traditional nested-loop join. If the index is built as part of the query plan and subsequently dropped, it is called

Relational databases allow you to navigate the data in ____________ that is appropriate using the primary, foreign key structure within the data model.

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

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

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

De-Normalization normally speeds up

In _________ system, the contents change with time. :

Cube is a __________ entity containing values of a certain fact at a certain aggregation level at an intersection of a combination of dimensions.

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

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.

The goal of star schema design is to simplify ________

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

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

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.

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?

Slice and Dice is changing the view of the data.

.______ is class of Decision Support Environment.