I feel that Microsoft DBA’s are not so worried about knowing every nook-and-cranny of their DBMS because Microsoft can always be relied on to find a specialist to help out 🙂
Oracle DBA’s on-the-other-hand know that Oracle PLC only does databases, not Support or Documentation (ok I may be exaggerating a bit). So Oracle DBA’s are on their own, and really need an intimate understanding of their particular DBMS internals.
I’m not inferring the superiority of one tribe over the other, just noting the difference 🙂
Database Consultant 