CS614 Midterm Online Quiz

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

De-Normalization normally speeds up

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

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

30.Data Warehouse is about taking / colleting data from different ________ sources:

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

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.

The automated, prospective analyses offered by data mining move beyond the analyses of past events provided by _____________ tools typical of decision support systems.

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

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

_______ is an application of information and data.

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.

DSS queries do not involve a primary key

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

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

5 million bales.

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

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

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

Multi-dimensional databases (MDDs) typically use ___________ formats to store pre-summarized cube structures.

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

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

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.

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

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

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 ___________

We must try to find the one access tool that will handle all the needs of their users.

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

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

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:

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

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

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

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

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

The goal of ideal parallel execution is to completely parallelize those parts of a computation that are not constrained by data dependencies. The smaller the portion of the program that must be executed __________, the greater the scalability of the computation.

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

Pre-computed _______ can solve performance problems

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

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

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.

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

Pre-join technique is used to avoid

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

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 _______.

Which statement is true for De-Normalization?

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

The goal of star schema design is to simplify ________

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

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