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The Oracle Environment
Oracle is a modular system that consists of the Oracle database and several functional
programs. Oracle's tools do four major things of work.
1. Database Management.
2. Data access and Manipulation.
3. Programming
4. Connectivity.
Database Management Tools
This (is usually known as RDBMS by oracle) includes the core programs for Oracle's
database management system, the Oracle database with its associated tables and views, which are
stores information related to every fact of the database system.User name, user access rights, table
attribute, storage information and auditing data for disaster recovery are stored in the data
dictionary.
The Database Administrator
The person responsible for a Database is called the DatabaseAdministrator(DBA).The
DBA has a special set of previleges and has complete over the database.Any system with more
than one user should have a DBA.The function of DBA include.
Creating primary database storage structures.
Modifying the structure of the database.
Backing up and restoring the database.
Monitoring database performance and efficiency.
Transfering data between database and external files.
Manipulating the phisical location of the database.
THE END USER
End user have less complex but equally important tasks.They must be able to
· Query the database.
· Generate printed output.
· Share data with or secure data from others.
· Use non-export methods to update the database.
· Define applications from a user point of view.
WHY ORACLE ?
Oracle is an open system i.e. the database is accessing by different data access
languages like SQL, Visual Basic, Power Builders,Delphi,VC++,JAVA etc.
Oracle supports database upto gigabytes in size.
* Oracle supports large number of concurrent users.
* Oracle supports true client/server environment.if enable processing to be spilt between
database server and the client application programs.
* Oracle provides high levelof data security in terms of users, passwords privileges, and
permissions.
* Oracle database behaves same on all platform line Windows,Unix,Dos,Mainframes etc.
Structure of Oracle Database:
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