Hi Surya,
It is not the maximum size of the decesion table but rather the maximum size of the generated ABAP class that is the concern.The class will hold not just the DT but the entire contents of the function, so it is difficult to discuss an absolute limit size of a decesion table ignoring the contents of the function that contains/uses it.
You will find the max size of an ABAP class with standard ABAP documentation.
Regards,
Indranil.