CS614 Midterm Online Quiz

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.

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

The need to synchronize data upon update is called

________ is the technique in which existing heterogeneous segments are reshuffled, relocated into homogeneous segments.

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

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

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 _______.

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

The goal of star schema design is to simplify ________

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

Horizontal splitting breaks a table into multiple tables based upon_______

Collapsing tables can be done on the ___________ relationships

Analytical processing uses ____________ , instead of record level access.

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 ___________

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

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...

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

The goal of star schema design is to simplify ________

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

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

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

De-Normalization normally speeds up

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

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

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

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.

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

 ________ gives total view of an organization

For a smooth DWH implementation we must be a technologist.

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.

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

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

A ________ dimension is a collection of random transactional codes, flags and/text attributes that are unrelated to any particular dimension. The ______ dimension is simply a structure that provides a convenient place to store the ______ attributes.

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

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

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

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

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

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

Normalization effects performance

It is observed that every year the amount of data recorded in an organization :

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

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

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

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

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

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

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

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.

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.