I Have a question from a Customer about ONLINE OPTION

Hi all,
I have the below question from one of my customers, and non being a DB expert I am not able to answer or even where to find a documentation supporting the answer.
"We need to know how the "Online Option" to reorg indexes or tables is safe to be used, this way:
- Alter table ... Move .. online;
- Alter table ... Rebuild .. online;
to understand if the technique can be used to maintain the DB without stopping service to end users.
The DB is in 11gR2. I do not want notes or PDF's but just answers on:
- It's Safe ? yes/No or Yes with some tricks, Best practices (which?)
- Any known issues or bugs or patches to be applied (or Service Packs)"
I was planning to setup a Bug Review with my ACS Service Engineers but they would like a quick preliminary answer to the fist question before starting the full Bug Review.
In my understanding, the Online option is to reorg indexes and not tables... am I right?
Which can be a documentation page or community discussion or any additional link you can share ?
Or may be you just have a full answer :)
Thank you
Kind regards
Chiara
Edited by: Chiara Scarafiotti on Jun 7, 2013 2:35 AM

Rebuilding an index online will lock the base table at the start and end of the rebuild, this can cause issues if there are active transactions see http://richardfoote.wordpress.com/2008/02/11/index-create-and-rebuild-locking-improvements-in-11g-ch-ch-ch-changes/
alter table move online will make any associated indexes unusable and these will need to be rebuilt after the table is moved.
Two other options:-
for indexes a coalesce is generally faster and requires less space.
For everything dbms_redefinition has more options and is less intrusive at the expense of being more complex.
Also probably the biggest risk is you move tables rebuild indexes charge your customer for all this work and it fails to improve anything (or actually makes things worse)

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