How can i create table which in use

Dear all,
How can i create a index on table which have much dml any time?

In 10g :
The CREATE ONLINE waits for existing transactions to commit before it can proceed. Once it starts, it uses a log table (MV Log) to track subsequent changes (i.e. it allows concurrent DML once it has started). At the end of the operation, it encounters another wait if there are existing transactions as it has to sync changes from the MV Log to the index.
Here's an explanation by Jonathan Lewis : Re: Alter Index Rebuild Online
In 11g :
There's an improvement in that only the transactions that were active at the instant when the CREATE .. ONLINE was issued are the ones it waits for. It does not have to wait on subsequent transactions.
Here's an explanation by Richard Foote : http://richardfoote.wordpress.com/2008/02/11/index-create-and-rebuild-locking-improvements-in-11g-ch-ch-ch-changes/
Hemant K Chitale

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