The word "expert" shares its roots with the word "experience", to warrant that the candidate had enough experience to be considered an "expert" in Oracle database administration.
Oracle is the world's most robust and flexible database, yet the complexity of Oracle is not rocket science and anyone with real-world Oracle experience is likely to be an Oracle expert.
A broad base with many different types of Oracle database is essential for developing expert status. On the other hand, a single DBA is more likely to get a broader range of experience. The best place to get experience is as an Oracle consultant where you are exposed to dozens of novel databases each year. A well-rounded Oracle DBA will have experience in many areas including OLTP, OLAP and batch databases.
We see these general types of Oracle databases, and an Oracle expert should have exposure to
Contents
Oracle ASM Oracle RAC Oracle Multitenant Oracle Data Guard Oracle Golden Gate Oracle Enterprise Manager Cloud Control