The document discusses database management systems and file-based systems. It describes some common uses of databases like tracking inventory and processing credit card transactions. It outlines the problems with traditional file-based systems, like the difficulty answering queries that require data from multiple files. A database management system aims to solve these problems by storing all related data together and allowing complex queries across multiple tables.
This presentation gives an overview of Databases and Term used in used in Databases Aspect. It also, help you to understand the clear description of Database Learning. Best Suited for Beginners and advanced level learners.
In this PPT, you will learn:
• The difference between data and information
• What a database is, the various types of databases, and why they are valuable assets for
decision making
• The importance of database design
• How modern databases evolved from file systems
• About flaws in file system data management
• The main components of the database system
• The main functions of a database management system (DBMS)
This presentation gives an overview of Databases and Term used in used in Databases Aspect. It also, help you to understand the clear description of Database Learning. Best Suited for Beginners and advanced level learners.
In this PPT, you will learn:
• The difference between data and information
• What a database is, the various types of databases, and why they are valuable assets for
decision making
• The importance of database design
• How modern databases evolved from file systems
• About flaws in file system data management
• The main components of the database system
• The main functions of a database management system (DBMS)
Kotler Keller - Marketing Management 15th edition
Chapter 01 Lecture slide
Made by Korea Institute of Marketing Education
http://www.marketingkorea.org
02-563-0717
DBMS Vs TRADITIONAL FILES COMPARISON, DBMS ADVANTAGES AND DISADVANTAGES, CLASSIC FILE BASED SYSTEM, ADVANTAGES AND DISADVANTAGES OF CLASSICAL TECHNIQUE
It includes:
Introduction to Database Management System
DBMS vs File System
View of data
Data models
Database Languages: DML, DDL
Database users and administrators
Transaction Management
Database System Structure
Application architectures
Cel 2 Data Management (Form 3) dated 4.8.14John James Yap
Form 3 students MUST read this in order to be able to answer questions in the coming lesson. You can also refer to you textbook from pages 109 through 116.
E-Business and E- Business Type and Transaction Process SystemRashed Barakzai
Transaction Process System,
Transaction Process Cycle,
Group Decision Support System (GDSS),
Group Decision Support System (GDSS) and it's Software tools
Data Mining is defined as extracting information from huge sets of data. In other words, we can say that data mining is the procedure of mining knowledge from data.
According to Inmon, a data warehouse is a subject oriented,
integrated, time-variant, and non-volatile collection of data. He defined the terms
in the sentence as follows:
4th edition mechanics of materials by beer johnston (solution manual)Faizan Shabbir
https://scitechentertainment.blogspot.com/search?label=BOOKS
for more books; please visit above link.
Please gain knowledge and share with others. if you need any other free book related to MECHANICAL ENGINEERING. mail me faizanhitec@gmail.com . . .
Determining the mechanical power of turbineFaizan Shabbir
Determining the mechanical power of turbine
o Objective :
To determine the mechanical power produced by turbine
o Theory background :
• Hydraulic machines :
Hydraulic machines are machinery and tools that use liquid fluid power to do simple work.
• Types of hydraulic machines :
Impulse turbines (e.g. Pelton wheel)
Reaction turbines (e.g. Francis turbine)
• Tachometer :
This instrument is used to find RPM . Usually 3 values of RPM are taken and then their average is used.
Head losses
Major Losses
Minor Losses
Definition • Dimensional Analysis • Types • Darcy Weisbech Equation • Major Losses • Minor Losses • Causes Head Losses
3. • Head loss is loss of energy per unit weight. • Head = Energy of Fluid / Weight • Head losses can be – Kinetic Head – Potential Head – Pressure Head 6/10/2015 4Danial Gondal Head Loss
4. • Kinetic Head – K.H. = kinetic energy / Weight = v² /2g • Potential Head – P.H = Potential Energy / Weight = mgz /mg = z • Pressure Head – P.H = P/ ρ g 6/10/2015 5
5. • (P/ ρ g) + (v² /2g ) + (z) = constant • (FL-2F-1L3LT-2L-1T2) + (L2T-2L1T2)+(L) = constant • (L) + (L) + (L) = constant • As L represent height so it is dimensionally L. 6/10/2015 6 Dimensional Analysis
6. • However the equation (P/ ρ g) + (v² /2g ) + (z) = constant Is valid for Bernoulli's Inviscid flow case. As we are studying viscous flow so (P1/ ρ g) + (v1² /2g ) + (z1) = EGL1(Energy Grade Line At point 1) (P2/ ρ g) + (v2² /2g ) + (z2) = EGL2(Energy Grade Line At point 2) 6/10/2015 7 Head Loss
7. • For Inviscid Flow EGL1 - EGL2= 0 • For Viscous Flow EGL1 - EGL2= Hf 6/10/2015 8 Head Loss
8. MAJOR LOSSES IN PIPES
9. •Friction loss is the loss of energy or “head” that occurs in pipe flow due to viscous effects generated by the surface of the pipe. • Friction Loss is considered as a "major loss" •In mechanical systems such as internal combustion engines, it refers to the power lost overcoming the friction between two moving surfaces. •This energy drop is dependent on the wall shear stress (τ) between the fluid and pipe surface. 6/10/2015 10 Friction Loss
10. •The shear stress of a flow is also dependent on whether the flow is turbulent or laminar. •For turbulent flow, the pressure drop is dependent on the roughness of the surface. •In laminar flow, the roughness effects of the wall are negligible because, in turbulent flow, a thin viscous layer is formed near the pipe surface that causes a loss in energy, while in laminar flow, this viscous layer is non-existent. 6/10/2015 11 Friction Loss
11. Frictional head losses are losses due to shear stress on the pipe walls. The general equation for head loss due to friction is the Darcy-Weisbach equation, which is where f = Darcy-Weisbach friction factor, L = length of pipe, D = pipe diameter, and V = cross sectional average flow velocity.
2. Objectives
• Some common uses of database systems.
• Characteristics of file-based systems.
• Problems with file-based approach.
• Meaning of the term database.
• Meaning of the term Database Management System
(DBMS)
• Typical functions of a DBMS.
• Major components of the DBMS environment.
• Personnel involved in the DBMS environment.
• History of the development of DBMS
• Advantages and disadvantages of DBMS
3. About Data
• The axiom "better data means better
decisions" is more true today than ever.
• No matter what business you're in, the
success of your organization depends on
accurate and timely information
4. First Thing First
• What is data?
• Why: you need data?
• Where: is data reside?
• Who: data belongs to?
• How: is it a worthwhile data?
5. Information Hierarchy
• Data: The raw Material of Information
• Information: Data organized and presented in
a particular manner.
• Knowledge: Justified True belief. Information
that can be acted upon.
• Wisdom: Integrated knowledge. High level
understanding
6. Some examples
• Purchases from a supermarket
• Bar code reader to scan each purchase.
• Bar code reader is linked to an application program
that uses the bar code to find out the price of the
item from a product database.
• This program reduces the number of such items in
stock and displays the price on the cash register.
• If the reorder level falls below a specified threshold,
the database system may automatically place an
order to obtain more stocks of that item.
7. Credit Card Example
• Purchases using your credit card
• Assistant normally checks you have sufficient credit left to
make the purchase. This can be done on the telephone or
may be done automatically by a card reader linked to a
computer system.
• There is a database somewhere that contains information
about the purchases you have made on your credit card.
• To check your credit there is a database application
program that uses your credit card number to check that
the price of the goods you wish to buy together with the
sum of the purchases you have already made this billing
period is within your credit limit.
8. Credit Card Example (conti..)
• After confirmation of the purchase the details of
the purchase are added to this database.
• The application program also accesses the
database to check that the credit card is not on a
list of stolen credit cards before authorizing the
purchase.
• There are other application programs to send
out monthly statements to each credit card
holder and to credit accounts when payment is
received
9. Traditional File-Based Systems
• The file-based system is the predecessor of the
database system.
• This approach is mostly obsolete but:
• understanding the problems inherent in file
based systems may prevent us from repeating
these problems in our database systems,
• understanding how the file system works is
extremely useful when converting a file-based
system to a database system.
10. File-Based Approach
• DEFN: The File-based system is a collection of
application programs that perform services for the
end-users such as the production of reports. Each
program defines and manages its own data.
• These were an early attempt to computerize the
manual filing system that most of us are familiar with.
• Really only works well when the number of items to be
stored is small.
• It works adequately when there are large numbers and
we have only to store and retrieve them
11. Terminology used in file-based
systems
• A file is simply a collection of records, which
contain logically related data.
• Each record contains a logically connected set
of one or more fields,
• where each field represents some
characteristics of the real-world object that is
being modeled.
12. When does the manual filing system
break down?
• The manual filing system breaks down when
we have to cross-reference or process
information in the files.
• Example: A typical real estate agent’s office
might have a separate file for each property
for sale or rent, each potential buyer and
renter, and each member of staff.
13. Real Estate Example ctd…
• How easy would it be to answer these questions using
this set up?
• What flats do you have for rent within three kilometres
of the city centre?
• What is the average rent for a two-bedroom flat?
• What is the total annual salary bill for staff?
• How does last month’s turnover compare with the
projected figure for this month?
• What is the expected monthly turnover for next
financial year?
14. University Management System
• Typically, a university might have different
departments:
• Admission Department
• Entry test, student enrolment, fee collection,
course registration etc.
• Examination Department
• Exams announcements, student results etc
• Employees Management Department.
• Course allocation, salaries etc.
15. University Management System ctd…
• Which students taking the course of IDS which
is allocated to ‘Uzair Muhammad’?
• How many students passed the prerequisite
subject OOP taking course IDS.
• Which students eligible for scholarship
according to University criteria?
16. Data Processing Staff (DP)
• The file-based system was developed in
response to the needs of industry for more
efficient data access. A decentralized
approach was taken, where each
department, with the assistance of Data
Processing (DP) staff, stored and controlled
its own data.
• We will illustrate this using an example
17. Example Real Estate ctd..
• The Sales Department is
responsible for selling and
renting property.
• The form that landlord has
to fill out before property
is marketed for rent is
shown;
• This gives details of rental
property as well as owner
(landlord) details.
19. • With assistance of Data
Processing (DP)
Department, Sales
Department creates an
information system to
handle renting the
property
• This consists of three
files containing
property, owner and
client details
20. • Contracts Department is
responsible for rental
agreements.
• Wheneveraclientagreesto
rentapropertyaformisfille
doutbyoneoftheSalesstaff
whichispassedtotheContr
actsDepartmentwhichallo
catesaleaenumberandco
mpletesthepaymentandre
ntalperioddetails.