Info needed on X_$ or V_$ !!

Dear All,
http://forums.oracle.com/forums/forum.jspa?forumID=61

1. Where we can use X_$ or V_$.
2. Is X_$ and V_$ contains the same data/info.
If the info is not same, then at which the info is presented.
3. Is both X_$ and V_$ are views

Please let me know your concerns.

Thanks,
Amit Verma
Oracle DBA & System Adminstrator

E-Mail:- in.amitverma@xxxxxxxxx, v.amit@xxxxxxxxxxx
WebSite:- http://www.linkedin.com/in/vamit
IM:- verma.labs@xxxxxxxxx
Mobile:- (+91) 98910.98927

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