CS614 Midterm Online Quiz

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

DTS allows us to connect through any data source or destination that is supported by ____________

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

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

The growth of master files and magnetic tapes exploded around the mid- _______. :

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.

For good decision making, data should be integrated across the organization to cross the LoB (Line of Business). This is to give the total view of organization from:

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

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 ___________

Slice and Dice is changing the view of the data.

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

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

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

Pre-computed _______ can solve performance problems

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

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

To identify the __________________ required we need to perform data profiling

Investing years in architecture and forgetting the primary purpose of solving business problems, results in inefficient application. This is the example of _________ mistake.

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

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.

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

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

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

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

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

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

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

: 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.

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.

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

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

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

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

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.

5 million bales.

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

The need to synchronize data upon update is called

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

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

_____modeling technique is more appropriate for data warehouses.

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.

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?

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

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.

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 _______.

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

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

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?