>> i am now a computer faculty.
You don't write like any professor I've ener met.
At what university are you tenured?
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>> can i change my job as dba after certification
It's not regulated, why stop there?
There are foreigners who give themselves titles like Supreme Majestic Certified DBA Expert Emeritus.
Here is one famous fakir:
http://www.dba-oracle.com/oracle_news/2004_11_22a_webb.htm