how does expdp use undospace

From: David Yu <mr.fishyu@xxxxxxxxx>
To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
Date: Thu, 29 May 2014 22:19:25 +0800

Hi List,

I am using expdp to dump two schemas  in two sessions with parallel3,but I have 
Ora-01555 error.

My understanding for the undo space usage by expdp is for the consistent read 
for  those blocks which are changed by the transactions after starting expdp. 
I'd like to understand how dose expdp use the undo space?


Rgds

David--
//www.freelists.org/webpage/oracle-l

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