Do we need any precautions while creating index in MV rather than tables?

Do we need any precautions while creating index in MV rather than tables?
Could you please someone tell me is there we need specifically follows while creation on MVs

MV is a seprate object. You might need to create an indexes on MViews based on how you are accessing that MV. You need to take a same preacutions what you take to create an index on the table,
I do not know what you mean by your 2nd questions. Read this for better understanding
http://docs.oracle.com/cd/B28359_01/server.111/b28326/repmview.htm

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    remove parallel clause and try again

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    HI
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    https://forums.sdn.sap.com/thread.jspa?threadID=953575&messageID=5752406#5752406
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    Thanks
    Hussain.

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