Oracle’s 9i OCP (Oracle Certified Professional) DBA (Database Administrator) certification is a mid-level certification for IT professionals who manage large-scale databases or develop applications that are used enterprise-wide. The Oracle 9i OCP was introduced in late 2001 and will likely stay very popular until the arrival of the Oracle 10G certification. There is no specific prerequisite for this certification; however, by starting your Oracle certification journey on the 9i path, you will achieve the OCA (Oracle Certified Associate) certification along the way.
This certification is well suited to IT personnel, with titles such as database administrator, database analyst, and database developer, who want to continue on with these roles or move into roles such as data warehouse architect, and data-mining expert. The Oracle 9i OCP designation is achieved by passing four exam as well as attending one instructor-led inclass or instructor-led online course.
Although Oracle certification paths eventually retire, you may continue to use a retired designation as it denotes the version of Oracle it is associated with. Also, Oracle normally provides a one exam upgrade to a newer version of a particular certification.
For more information:
http://www.oracle.com/education/certification/index.html?dba9i_ocp.html
CORE EXAMS
(1Z0-030) Oracle8i to Oracle9i DBA OCP Upgrade 
(1Z0-032) DBA Fundamentals II 
(1Z0-033) Performance Tuning 
(1Z0-035) Oracle7.3 & 8 to Oracle9i DBA OCP Upgrade