Database management-system

DATABASES

Presented by,
R.Mujeebabeham
Final year,CSE.

SEQUENCES:

1.Definition(DBMS)

2.Components Of DBMS
RDBMS
ODBMS

3.Types of Database

4.Models

5.Storage Structure

6.Indexing

7.Transaction

8.Replication

9.Security(Confidentiality)

10.Locking

11.OnLine DATABASE's
List of OnLine DB's

1.Definition(DBMS):

A database consists of an organized
collection of data.

Digital databases are managed using
database management systems, which
store database contents, allowing data
creation and maintenance, and search and
other access.

2.Components Of DBMS:
Most DBMS as of 2009 implement a relational model.

i)RDBMS components:

Sublanguages DDL, DCL, DML.


Interface driversJDBC,ODBC,MySQL/PHP,
FireBird/Python.


SQL engine, Transaction engine, Relational engine,
Storage engine.

ii)ODBMS Components:


ODBMS handle DDL, DCL and update tasks
differently. Instead of using sublanguages, they provide
APIs for these purposes.


Example object query languages are OQL, LINQ,
JDOQL, JPAQL and others.


The query engine returns collections of objects instead
of relational rows.

3.Types of Database:

operational DB   Distributed DB

Datawarehouse  End_User DB

Analytical DB      External DB

          Hypermedia DB

4.Models:

Postrelational database models
Products offering a more general data
model than the relational model are
sometimes classified as Postrelation.


Object database models
     object databases attempt to introduce
     key ideas of object programming, such
     as envapsulation and Polymorphism,
     into the world of databases.

5.Storage Structure:

Databases may store relational
tables/indexes in memory or on hard disk in
one of many forms:


ordered/unordered flat files

ISAM

Heaps

Hash buckets

logicallyblocked files

B+ trees

6.Indexing:

Indexing is a technique for improving database
performance.


In large databases, this can reduce query time/cost by
orders of magnitude.

7.Transaction:

DBMS provide some form of support for
transaction.


Itallow multiple data items to be updated in a
consistent fashion.

ACID RULES:
1.Atomicity: Either all the data changes in a
transaction must happen, or none of them.

2.Consistency: Every transaction must be
Preserved.

3.Isolation:Two concurrent transactions cannot
interfere with one another

4.Durability:Completed transactions cannot be
aborted later.

8.Replication:

Replication involves maintaining multiple copies of a
database on different computers, to allow more users to
access it.

9.Security(Confidentiality):

DBMSs usually enforce security through access
control, auditing, and encryption.

10.Locking:

Locks also provide one method of ensuring that data
does not change while a transaction that once read it
has completed.


An online database is a database accessible from a
network, including from the Internet.


Some differences from typical traditional databases
such as Oracle, Microsoft SQL Server, Sybase..etc

(i)These online databases are delivered primarily via a
web browser .

(ii)They are often purchased by a monthly subscription

(iii)They embed common collaboration features such as
sharing, email notifications, etc.

My conclusion:

Open source Databases for “CONTENT


MANAGEMENT SYSTEM ”

What Open Source Databases are there?


MySQL
PostgreSQL
Berkeley DB
mSQL
SAP DB
InterBase

MySQL:


Most widely used OSDB
Very fast read access, good for web apps

SQL interface, ODBC, JDBC


Language bindings


C, C++, Perl, Python, TCL

Commercially supported


MySQL AB
NuSphere

Database architecture
in LAMP

Open source spatial databases (PostGIS) are new,
but are already in use around the world.

Many GIS database problems can now realistically
be addressed with open source technology


Open source databases have the capabilities to
handle real world problems, and are in widespread
use.

Database management-system

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