In TDSHL, no table excluded = complete database export?

Experts:

We get the same issue that is a complete database export generated WITHOUT  the expected size reduction.

When executing the activity " Determine tables to be excluded from the export" , we did NOT exclude any table.

Is this the reason why a complete DB export created? 

Because the export is done outside of cnv_mbt_tdms on OS level.  If NO table is excluded, I do not see

any TDMS step can  influence the export control file.   If I am wrong, could you tell me which TDMS step

influence the control file to reduce the export size?

We truly have made sure that the default sapinst_dir is  NOT used for the export, i.e. the *TPL file created by

R3ldctl is used by sapinst and export monitor.

Could you tell how to avoid this ?

Thanks!