The MCDBA is for SQL 2000 and is close to retirement, if not already retired.
Look at the MCITP (Database admin) for SQL 2005.
http://www.microsoft.com/learning/mcp/mcitp/dbadmin/
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability