Introduction

      It is very large and multi user Database Management System. Oracle Database is a collection of data treated as a unit. The purpose of a database is to store data and retrieve related information. 

      Oracle Database is the first database designed for enterprise grid computing, the most flexible and cost effective way to manage information and applications. It is the excellent database server choice for client/computing. Oracle supports in all major operating system.

   The database has logical structures and physical structures. Because the physical and logical structures are separate, the physical storage of data can be managed without affecting the access to logical storage structures.

                             

      i – internet

      g – grid

      c – cloud

 

History:-

1977 Software Development Laboratories, the precursor to Oracle, is founded by Larry Ellison, Bob Miner, and Ed Oates.

1978 Oracle Version 1, written in assembly language, runs on PDP-11 under RSX, in 128K of memory. Implementation separates Oracle code and user code.Oracle V1 is never officially released.

1979 Oracle Version 2, the first commercial SQL relational database management system, is released. The company changes its name to Relational Software Inc. (RSI).

1981 RSI Started developing tools for Oracle.

1982 RSI Renamed as Oracle Corporation.

1983 Oracle Released version 3.0 (rewritten in C language and multiple Platforms).

1984/1985 Oracle Released version 4.0 ( Concurrency control , consistency etc)

1986 Oracle Released client/server relational database.

1989 Oracle Released version 6.0.

1997 Oracle Released version 8.0 (object relational).

1999 Oracle Released version 8i (internet) (Java Virtual Machine).

2000 Oracle Released Application Server.

2001 Oracle Released  9i (internet) Database server.

2003/2004  Oracle Released 10g (Grid) Database server.

2009  Oracle Released  Oracle version 11g (Grid) Database server.

2014  Oracle Released  Oracle 12c (Cloud) Database server.