Best way to update an OLTP table?

Hello
We have an OLTP table with huge data.
We need to update a column of the status of "n" 'Y' for nearly 70% of the rows based on certain conditions.
This table is accessed by hundreds of sessions at a time.
So, what is the best way to do the same.

Rgds,
ORS

Then, find some interruptions of service and do the update...
or simply do it. It might take awhile, but if to do... to do.

Tags: Database

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