Hi,

I want to take backup of all my tables in my system and i want to use in other system.Tell me how to take back up tables in oracle 9i and how to import or use those backup table in another system???

You need to take and export of the schema and import the same into the target system.

you need to use the following commands for the purpose.

EXP
IMP

please find the details here , here and here.