[QUOTE][i]First, you must calculate the column size, including byte lengths:

Column size including byte length = column size + (1, if column size < 250, else 3)

Hi Sanjay,

Still my question is How much byte size Oracle considers against each column below for its data type to calculate RowSize?

colA char(3)
colB varchar2(3)
colC number(5,2)
colD date
colE raw(25)
colF rowid
colG long
colH blob
colI clob

I don't think that foruma "Column size including byte length = column size + (1, if column size < 250, else 3)" is same for all the data types.

Any more inputs?

Thanks any way.