introduction to DBMS and MS Access

1. Database Management System(DBMS)
• A database management system (DBMS) is a
collection of interrelated data and a set of
programs to access those data.
• The collection of data, usually referred to as the
database, contains information relevant to an
enterprise.
• The primary goal of a DBMS is to provide a way
to store and retrieve database information that
is both convenient and efficient.

2. Characteristics
1. Real Entity: An entity can be a real world object, that can be easily identifiable. For
example in a school database , students, teachers , classes and offered courses
offered can be considered as entities .
2. Relation based structure: DBMS allows entities and relations between them to form
tables . A user can understand the architecture of a database just by seeing at the
table names.
3. Inaccessibility of data and application:
4. Lowest redundancy
5. Consistency
6. Query languages
7. ACID Properties used in transactions .A-Atomicity,
C-consistency, I-Issolation , D-Durability
1. Concurrent and multiuser access
2. Multiple views
3. Security

3. Advantages of DBMS
• Data Independence
• Efficient Data Access
• Data Security and integrity
• Reduced Development time

4. Disadvantages of DBMS
• Complexity
• Skilled Personnel
• Cost
• Lower Efficiency

5. Schema and Instance
• The overall design of the database is called the
database schema.
• The collection of the information stored in the
database at a certain moment is called an instance of
the database.

6. Data models
• The structure of a database is the data model: a
collection of conceptual tools for describing data, data
relationships, data semantics, and consistency
constraints.
• To illustrate the concept of a data model, we outline
two data models in this section: the entity-relationship
model and the relational model. Both provide a way to
describe the design of a database at the logical level

7. Entity Relationship Data model
The entity-relationship (E-R) data model is based on a perception of a real world
that consists of a collection of basic objects, called entities, and of relationships
among these objects. An entity is a “thing” or “object” in the real world that is
distinguishable from other objects. For example, each person is an entity, and
bank accounts can be considered as entities.
customer accountDepositer

8. Relational Data models
• The relational model uses a collection of tables to represent both data and the
relationships among those data. Each table has multiple columns, and each column
has a unique name. It uses the unique key called primary key to identify record
uniquely.

9. Microsoft access
• Microsoft Access is a Relational Database
Management System (RDBMS), designed
primarily for home or small business usage.
• Access is known as a desktop database system
because it's functions are intended to be run
from a single computer. This is in contrast to
a server database application (such as SQL
Server), where it is intended to be installed on
a server, then accessed remotely from
multiple client machines.

10. BASICS
• A Table is an arrangement of data in a row
and column.
• A field is a column in a table that contains
particular information about a record.
• A Primary Key is a field uniquely identifies
every record in a table.
• A Record is a set of information stored about a
particular entry.

11. • Forms are used to customize formats for
adding, editing, deleting or displaying data.
• Queries display information from one or more
tables based on a selection criteria.
• Reports contain data from one or more tables
and databases that can be printed. Selective
fields and records can be displayed in a report.
• Macros perform a fixed set of tasks every
time they are run.

12. All about Tables
• Opening up MS Access and creating a table.

13. Table Design Toolbar
Creating Fields
Defining data types

14. • Text data type is used to store all valid printable
characters. Default size is 255.
• Memo data type is used to create a text field in which
size of the values can vary widely . Like to store
paragraph its size is 6500 characters.
• Number data type enables you to enter numeric data.
• Currency data type enables you to enter monetary
data.
• Date/Time data type can store date and time values.
• Yes/No data type, also known as a logical type, stores
data that can have only two values.

15. • Auto number data type stores an integer that
is incremented or decremented automatically
as you add or delete records.
• OLE object type can store any type of object
such as video clip, a picture or a word
document.
• Lookup Wizard is a field that displays a list
that looks up data from an existing table or
from a fixed set of user-defined values.