Bitmap Index for marking and unmarking

Hello

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I'm running on a 10.2.0.4 DB, and I have a table with a column which is use for marking and unmarking records.

Table has around twelve millions of rows, column has at most three distinct values (including nulls) and constantly is performed masive updates on this column for specific processes.

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My question is: is it recommendable to use a bitmap index for that column?

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Regards.