What should be optimizer mode

Oracle 10g Rl- 2 (RAC)
OS- HP-UX 11i
Optimizer_mode parameter is all_rows in my database. It is OLTP enviornment.
What should be the the optimizer in this condition?

pls go through this link.
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams145.htm

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