Oracle,the second largest software company in the world

Question

Although Oracle have a large scale,However, unlike the reputation of Microsoft, IBM, as a prominent,even if many people don't know what is it,but if you want to join in IT,you should know what is Oracle.
First,Oracle is a software company,the company who founded in 1977 Califonia is the world's first company to launch Relational Data Management System(RDBMS).RDBMS have been widely used in various operating environments:Windows NT?UNIX-based minicomputer system?IBM mainframe and some special hardware operating system platforms.In fact,Oracle has become the world's largest supplier of RDBMS.To some extent,Oracle has become synonymous with the RDBMS.Oracle has been actively expanding its business, and successfully developed a number of horizontal and vertical product,for example:Oracle server,Oracle Exchange and Oracle Data Center.
Origin of Oracle Certified Professional
1.Oracle has a wide variety of industries for many years in a variety of solutions,have a different customer environment based on Oracle RDMBS server tools and application of large-scale software systems.
2.The system is being widely used by all walks of life in varying degrees.
So people who can be able to master certain aspects of the system and adapt to the constant renewal of the system of professional engineers from all walks of life must be in urgent need of talent,have good employment prospects.
Oracle Certification Category
Oracle Certified Professional(OCP) is Oracle Corporation authorized by the International Center for the examination of candidates for certification accreditation.
1.Database Administrator  DBA  responsible for day-to-day database management, database backup and recovery after the collapse.
2.Database Operator       DBO
3.Database Developer      DEV
4.Java Developer
5.Application Consultant
Oracle DBA is the most popular, but it is also one of the most difficult certification test.