Not all organizations that utilize Oracle Databases immediately upgrade to the newest release. For this reason, Database Administrators often need to validate their expertise in the older versions. Currently, oracle offers certification exams and DBA certification options for the 10g, even while 11g options are also available.
DBAs have the chance to obtain their intermediate or master level certifications from Oracle. The most commonly completed of these exams are the 1Z0-042 and 1Z0-043, which are the Administrator I & II exams, respectively. However, you can additionally document your skills in managing Oracle on Linux, with the 1Z0-046, or demonstrate your expertise with new features for the Oracle 8i OCPs, with the 1Z0-045 exam.
Real Application Clusters in the 10g environment can also be proven by successfully completing the 1Z0-048 exam, and mastery of the Oracle Database 10g administrator function is achieved with the 10GOCM exam.
No matter which exam or certification path you decide will serve you best, you want to ensure you are successful on your first testing attempt. Preparation is the way to accomplish your goals, and practice tests are essential. Sites like examtrace.com are a wonderful resource in this respect, providing access to full length practice tests that are so like the real certification exam you will take that you will be fully prepared by the time you sit for your exam(s).