what is the step by step procedure for reducing MAX size of redo logs.
what does it mean? you want to reduce the size of redo log files? reducing redo log size will not reduce the amount of redo generating in a day.

you need to analyze the programing logic of the sql to identify why they are generating more redo. also, if you are using sql*loader use direct path load to stop generating redo.

google it for more options depends on what is running in your machine.

Thanks,