CS614 Midterm Online Quiz

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

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

_____modeling technique is more appropriate for data warehouses.

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.

De-Normalization normally speeds up

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.

If someone told you that he had a good model to predict customer usage, the first thing you might try would be to ask him to apply his model to your customer _______, where you already knew the answer.

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

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?

Suppose the amount of data recorded in an organization is doubled every year. This increase is __________ .

The goal of star schema design is to simplify ________

A dense index, if fits into memory, costs only ______ disk I/O access to locate a record by given key.

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

B-Tree is used as an index to provide access to records

The goal of star schema design is to simplify ________

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

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

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 _________ 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.

De-Normalization normally speeds up

Pre-join technique is used to avoid

Pre-computed _______ can solve performance problems

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

 ________ gives total view of an organization

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

Analytical processing uses ____________ , instead of record level access.

As apposed to the out come of classification, estimation deal with ____________ valued outcome.

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

Ad-hoc access means to run such queries which are known already.

The Kimball s iterative data warehouse development approach drew on decades of experience to develop the _________.

Which statement is true for De-Normalization?

Slice and Dice is changing the view of the data.

_____________ is a process which involves gathering of information about column through execution of certain queries with intention to identify erroneous records.

Horizontal splitting breaks a table into multiple tables based upon_______

Pipeline parallelism focuses on increasing throughput of task execution, NOT on __________ sub-task execution time.

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 ___________

Grain is the ________ level of data stored in the warehouse.

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

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?

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

Pre-computed _______ can solve performance problems

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 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.

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

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

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

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

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

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

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.