Volatility – This is the frequency with which records are added to the fileor
deleted from it. If the frequency is high, the file is said to be volatile.
A file that is not altered is ?static?. If frequency is low, the file
is said to be ?semi-static?.
Activity –Is the processing of a master file. Hit rate is a measure of the
=activity‘ of the file.
Size –This is the amount of data stored in the file. It may be expressed
interms of the number of characters or number of records.
Growth –Files often grow steadily in size as new records are added. growth
mustbe allowed for when planning how to store a file.
(ii)
Volatility
- A file with Volatile variable (has data that can be changed with external process)
is preferably
designed to be accessed using index sequential.
- This is because of speed of access; index sequential files are fast to locate than random or
sequential files.
- For a file whose records are relatively permanent in nature meaning that the hit rate
is low, then random file organization would be preferred.
Activity
- Files that are accessed every now and then should be designed to be accessed using
index sequential method. Speed being one of the reasons for this. Since its mostly used
in transaction files where the hit rate is high to enable records to be located faster.
Size
- A small sized file can well be accessed using random method or sequential method where
as a large file containing large amount of data, its data can easily be located using an
index sequential method since an index file can be used to effectively overcome the
problem of key searching, and to speed up the key search as well.
Growth
- The same consideration would be put in place as that of size of files.
gregorymasila answered the question on November 27, 2017 at 11:19
- Organizations use different options of human computer interfaces such as GUI, command driven or special interfaces. Define GUI and state its advantages.(Solved)
Organizations use different options of human computer interfaces such as GUI, command driven or special interfaces. Define GUI and state its advantages.
Date posted: November 27, 2017. Answers (1)
- Witu Ltd., a motor vehicle spare parts dealer, has its head office in Nairobi. The company
has eight branches in Kenya, two in Uganda and...(Solved)
Witu Ltd., a motor vehicle spare parts dealer, has its head office in Nairobi. The company
has eight branches in Kenya, two in Uganda and one in Rwanda. To enable the branches
share data and other resources, the company has a large database that is replicated in the
computers located in the branches. These computers are interconnected through data
communication networks. The database is centrally administered from Nairobi but the
branches have flexibility and may customize the database to meet their needs.
State the type of database used by Witu Ltd. (2 marks)
Date posted: November 27, 2017. Answers (1)
- Witu Ltd., a motor vehicle spare parts dealer, has its head office in Nairobi. The company has eight branches in Kenya, two in Uganda and...(Solved)
Witu Ltd., a motor vehicle spare parts dealer, has its head office in Nairobi. The company has eight branches in Kenya, two in Uganda and one in Rwanda. To enable the branches share data and other resources, the company has a large database that is replicated in the computers located in the branches. These computers are interconnected through data communication networks. The database is centrally administered from Nairobi but the branches have flexibility and may customize the database to meet their needs.
(i)State and briefly explain advantages and disadvantages of the database used by
Witu Ltd.
(ii)Explain the business reasons that may have encouraged Witu Ltd. to use this
database.
Date posted: November 27, 2017. Answers (1)
- Explain how the following systems development tools or techniques can assist a systems developer to reduce an application‘s development period and costs.(i) Fourth generation languages (4GLs)....(Solved)
Explain how the following systems development tools or techniques can assist a
systems developer to reduce an application‘s development period and costs.
(i) Fourth generation languages (4GLs).
(ii) Prototyping
(iii) Computer aided software engineering (CASE) tools.
Date posted: November 27, 2017. Answers (1)
- (i) Using the general systems theory, indicate whether this is an open loop or closed loop control system.(ii) Explain the importance of open loop...(Solved)
(i) Using the general systems theory, indicate whether this is an open loop or closed loop control system.
(ii) Explain the importance of open loop and closed loop control concepts in the context of a business system.
Date posted: November 27, 2017. Answers (1)
- Explain three major benefits of mobile banking (M-banking)(Solved)
Explain three major benefits of mobile banking (M-banking).
Date posted: November 27, 2017. Answers (1)
- Explain the importance of artificial intelligence (AI) to a developing country(Solved)
Explain the importance of artificial intelligence (AI) to a developing country.
Date posted: November 27, 2017. Answers (1)
- Outline any two anomalies that are associated with redundant data.(Solved)
Outline any two anomalies that are associated with redundant data.
Date posted: November 27, 2017. Answers (1)
- Most computers in use today have open architecture which enables users to open them easily and install new devices. The need to buy new computers...(Solved)
Most computers in use today have open architecture which enables users to open them easily and install new devices. The need to buy new computers is reduced since the existing capability may be enhanced using expansion slots on the computer motherboard to plug in expansion cards.
Required:
Describe any three types of expansion cards.
Date posted: November 27, 2017. Answers (1)
- List four scanning devices and explain how a scanning device works(Solved)
List four scanning devices and explain how a scanning device works. (8 marks)
Date posted: November 27, 2017. Answers (1)
- Digital video disk (DVD) is a relatively new type of data storage device that may be used for diverse data storage tasks. Describe three characteristics of...(Solved)
Digital video disk (DVD) is a relatively new type of data storage device that may be used for diverse data storage tasks.
Describe three characteristics of a DVD.
Date posted: November 27, 2017. Answers (1)
- Auditing information systems by a company's internal auditing staff or external auditors is aimed partly at evaluating whether proper and adequate security measures and management...(Solved)
Auditing information systems by a company's internal auditing staff or external auditors is aimed partly at evaluating whether proper and adequate security measures and management policies have been developed.
Required:
(i) Define the term electronic audit trail
(ii) Differentiate between auditing around the computer and auditing through the
computer and explain the approach which uses electronic audit trial.
(iii) State four skills required of information systems auditors.
Date posted: November 27, 2017. Answers (1)
- Explain the factors that have led to the decentralization of information systems functions(Solved)
Explain the factors that have led to the decentralization of information systems functions.
Date posted: November 27, 2017. Answers (1)
- Dunga Beach Sacco Ltd., a farmers savings and credit co-operative society based in Kisumu Municipality installed an enterprise resource planning (ERP) software two years ago....(Solved)
Dunga Beach Sacco Ltd., a farmers savings and credit co-operative society based in
Kisumu Municipality installed an enterprise resource planning (ERP) software two
years ago. At the time of installation, the Sacco did not undertake the necessary
business process changes, as a result of which most users still prefer to use the
manual system. The Sacco is now planning to undertake the necessary changes.
Required:
(i) State four obstacles that may have hampered the business process changes and suggest four possible strategies that may be used to overcome the obstacles.
(ii) A post installation review of the system revealed that the system was not realizing the anticipated benefits. List six other key areas that the review should have focused on other than the benefits.
Date posted: November 27, 2017. Answers (1)
- Explain the role of information communication technology in business process re-engineering(Solved)
Explain the role of information communication technology in business process re-engineering.
Date posted: November 27, 2017. Answers (1)
- In a systems development life cycle, the systems analyst is interested in finding out the organization's objectives and exploring the nature and scope of the...(Solved)
In a systems development life cycle, the systems analyst is interested in finding out the organization's objectives and exploring the nature and scope of the problems under study during the feasibility stage.
Required:
(i) Explain three objectives of a feasibility study.
(ii) Explain the methods used by the systems analyst in defining the objectives
of an organization.
Date posted: November 27, 2017. Answers (1)
- The increased use of multimedia technology can be largely attributed to the easy-to-use presentation software together with the decreasing costs of the necessary hardware such...(Solved)
The increased use of multimedia technology can be largely attributed to the easy-
to-use presentation software together with the decreasing costs of the necessary
hardware such as LCD projection panels and laptop computers.
Required:
(i) State four elements of multimedia technology.
(ii) Explain two major uses of multimedia technology.
Date posted: November 27, 2017. Answers (1)
- Outline the functions of Read Only Memory (ROM).(Solved)
Outline the functions of Read Only Memory (ROM).
Date posted: November 25, 2017. Answers (1)
- Outline the functions of Random Access Memory (RAM).(Solved)
Outline the functions of Random Access Memory (RAM).
Date posted: November 25, 2017. Answers (1)
- Outline the duties of a computer programmer.(Solved)
Outline the duties of a computer programmer.
Date posted: November 25, 2017. Answers (1)