Why "Separating Data and Indexes improves performance" is a myth?

Hi
Does any one kwnows please,
Why "Separating Data and Indexes improves performance" is a myth?

If they are both accesed at the same time, it will improve performance or
not,
I don't understand exactly what is this myth about?

http://www.niall.litchfield.dial.pipex.com/OracleMyths.zip

Thanks


Juan Carlos Reyes Pacheco
OCP
Database 9.2 Standard Edition


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