How to make an update of millions of rows using only one commit statement?

Hi, I need to execute a complex update statement over a partitioned table. I take advantage of partitioning: loop for each partition, do the update and make commit. Of that way I'm updating and then commiting around 600.000 rows.
But some of our systems have Oracle Standar Edition version and partitioning is not supported. I want to make the same update without taking advantage of partitioning. That is my problem. I need to update around 15.000.000 of rows but if I try to make commit at the end, this update generates a lot of UNDO data and fails because there is not enought space for retention.
I would like to know your suggestions. There is some way of avoid UNDO data generation? There is some way to execute commit automatically?
Thanks for your support.

>
This is exactly what I was looking for. Its a shame is only available in 11.2.
>
Then you may be interested in 'Do-It-Yourself Parallelism' for your 10g version to accomplish the same thing very effectivelyl.
See the 'Do-It-Yourself Parallelism' section of this article by Tom Kyte.
http://www.oracle.com/technetwork/issue-archive/2009/09-nov/o69asktom-089919.html
>
In my book Expert Oracle Database Architecture , I spent quite a few pages describing how to perform batch operations “in parallel,” using a do-it-yourself parallelism approach. The approach was to break up a table into ranges, using rowids (see www.bit.ly/jRysl for an overview) or primary key ranges (see “Splitting Up a Large Table”). Although the approach I described was rather straightforward, it was always also rather manual. You had to take my “technique” and tweak it for your specific circumstances.
>
You really should get the book since it has ALL of the details. But the above quote has a link to that "Splitting Up a Large Table" doc and that doc shows how to do it.,
http://www.oracle.com/technetwork/issue-archive/2006/06-jan/o16asktom-101983.html
>
Splitting Up a Large Table
I would like to partition a range of values into balanced sets. Initially I figured that one of the analytics functions might be useful for this and decided to look into these and learn more about them. The question I had in mind was, "For an ordered list of values, how can we 'chop' them into ranges and then list the first and last value for each range?"

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