More DBA job interview questions and answers at
http://dba.fyicenter.com/Interview-Questions/
(Continued from previous question...)
Sources of DBA Certification Information
Oracle
http://www.oracle.com/education/certification/
Microsoft SQL Server
http://www.microsoft.com/trainingandservices/default.asp?PageID=training
IBM DB2
http://www.ibm.com/certify
Sybase Adaptive Server
http://www.sybase.com/education/profcert/
Informix
http://www-3.ibm.com/software/data/informix/education