Issue in updating large number of rows which is taking a long time

Hi all,
Am new to oracle forums. First I will explain my problems as below:
1) I have a table of 350 columns for which i have two indexes. One is for primary key's id
and the other is the composite id (combination of two functional ids)
2) Through my application, the user can calculate some functional conditions and the result
is updated in the same table.
3) The table consists of all input, intermediate and output columns.
4) The only way of calculation is done through update statements. The problem is, for one
complete process, the total number of update statement hits the db is around 1000.
5) From the two index, one indexed column is mandatory in all update where clause. So one
will come at any case but the other is optional.
6) Updating the table is taking a long time if the row count exceeds 1lakh.
7) I will now explain the scenario:
a. Say there is 5lakh 100 records in the table in which mandatory indexed column id 1 has
100 records and id 2 has 5 lakhs record.
b. If I process id 1, it is very fast and executed within 10seconds. But if I process id 2,
then it is taking more than 4 minutes to update.
Is there any way to increase the speed of the update statement. Am using oracle 10g.
Please help me in this, Since I am a developer and dont have much knowledge in oracle.
Thanks in advance.
Regards,
Sethu

refer the link:
http://hoopercharles.wordpress.com/2010/03/09/vsession_longops-wheres-my-sql-statement/

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