My Databse size is 10 gb what will be my export dump size?

My Databse size is 10 gb what will be my export dump size?
Why is there is difference ?

Hi,
an Oracle Block constists not only of the row-data itself,
but also has a block header.
This is made up ofdifferent structures which will use about
- 60 bytes of fixed administrative information for the block
- 24 bytes per transaction slot (depending of the value inittrans there will be a number of preallocated slots for transaction pointers, default 1 for tables 2 for indexes, in every block header) this socalled ITL consists of three parts:
- Undo segment number the transaction is using for the before images
- Undo slot number in the undo segment
- sequence number (this will be incremented at commit time)
2 bytes for every row which is inserted into the block.
Also the rows have a header each (congtaining the number of columns belonging to the row for example) and every column in a row has header also(containing the informatin of the datatype and the length of the value for the column.
You see that there is a lot more info in a block than just the rowdata.

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