database and types of database
TRANSCRIPT
Date:9-1-2015
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DATABASE AND TYPES OF DATABASE
DATABASE MANAGEMENT SYSTEM
A Database is a collection of records.
Database management systems are designed
as the means of managing
all the records. DBMS is a software system
designed to allow the definition , update ,
retrieval and administration of databases.
TYPES OF DATABASE
•Relational database
•Document oriented database
•Embedded database
•Graph database
•Hypertext database
•Operational database
•Distributed database
•Flat file
RELATIONAL DATABASE
A relational database is a database that has a collection
of tables of data items.
Data in a single table represents a relations.
Tables consist of rows and columns.
The columns constitute the attributes.
The rows constitute tuples.
• Row-A data set representing a single item.
• Column-A labeled element of a tuple, e.g. "Address" or "Date of
birth”, of multiple data item.
A primary key is used to uniquely identify each row.
The foreign key a column or group of columns in one table that
points to the primary key of another table.
DOCUMENT ORIENTED DATABASE
A computer program designed for storing, retrieving and
managing document oriented information.
Documents inside a document-oriented database are similar to
records or rows in relational databases.
Do not store data in tables with uniform sized fields for each
record.
Any number of fields of any length can be added to a document.
EMBEDDED DATABASE
•The databases consist of data developed by individual end
users.
•Examples of these are collection of documents, spreadsheets,
presentations and other files.
GRAPH DATABASE
A graph database is a database that uses graph structures with
nodes, edges, and properties to represent and store data.
A graph database is any storage system that provides index-free
adjacency.
This means that every element contains a direct pointer to its
adjacent elements.
HYPERTEXT DATABASE
Hypertext databases are particularly useful for organizing large
amount of disparate information.
Hypertext is text displayed on a computer display or other
electronic devices with references to other text which the reader
can immediately access.
Pages often written in HTML.
OPERATIONAL DATABASE
An operational database contains data about the things
that go on inside an organization or enterprise.
Example: data on customer complaints, employee
information, etc.
DISTRIBUTED DATABASE
It is a database in which portions of the database are stored on
multiple computers within a network.
The DDBMS synchronizes all the data periodically.
Updates and deletes performed on the data at one location will
be automatically reflected in the data stored elsewhere.
FLAT FILE
A flat file database is a database that stores data in a
plain text file.
Flat files are ideal for small amount of data.
Each line of the text file holds one record, with fields
separated by delimiters, such as commas or tabs.
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