Question: What is the actual work of a Oracle DBA and SUN Administrator? 

Answer: An Oracle Database Administrator holds a key role in keeping the system up and running and hence, whatever business it supports up and running. It is a very technical role. They are typically the ones who move objects (tables, views, triggers, functions...) from one environment to the next (Development-->test-->production). They work closely with developers who write software to read/write/update/delete data to and from the database.  They monitor database size allocations and make adjustments for growth. they determine proper data elements that should be used for indexes so that searches against the database run quickly for customers. There is much more. It is a demanding job and they are often the first ones who are required to 'get the system back up and running' when the database goes nutty. (like when someone accidently submits a wacked out query doing a full table scan.\na SUN administrator is different than a DBA because they do not focus on the database but they keep the server hardware running that the database runs on. They monitor server performance and deploy other custom written unix or java applications that programmers have developed. they too get involved with 'getting the system back up' when something goes haywire. It is also a very technical role and requires great knowledge of the unix commands and operating system.
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