How to insert data fast

I am going to insert 2GB data into oracle database. But it took about 1 hour to insert 40MB data.!!

The situation is as follows.

 1 Data is created by program and sent to oracle by oci functions.  2 Data is stored in array(size 100) and sent by 'oexn' function.  3 Commit is made for each oexn.
 4
 4 It is impossible to use The direct path for SQL*Loader ,

    because table are made on hashed cluster.    It is invalid to use the direct path SQLload for hashed cluster.  5 SQL*Loader using normal path is slower than the oci program.

I have some questions.
Please send mail to takaoki_at_ok.cow.melco.co.jp   ,if it's not inconvinient for you.    

Q1,Are there way to tuen Redo Log off?

   If someone knows it, Please tell me.
   If Redo Log turned off,data insert would be much faster,wouldn't it? Q2,What parameters do I have to change in order to fast data insert ?

    and to What values do I set those parameters? Q3,

Thanks in advance.

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