Find The Memory Occupied

Hai all,

I came a situation where i want to follow one of the method so that memory in the database occupies less.

1) directly exporting the large data into cluster table

2) transform large data using call transformation and then store in cluster table.

i want to which process is best and to follow

i tested this way , but not knowing how to decide.

1)

*EXPORT mdata = ls_prf_data-mdata

comment_c_data = ls_prf_data-cmnt_c_data

comment_ca_data = ls_prf_data-cmnt_ca_data

hier_data = ls_prf_data-hier_data

kffcat = lwa_mxdhdr-kffcat TO DATABASE zclust_db(pt) ID ls_mxdoc.

2) where lv_xml is the string

EXPORT lv_xml TO DATABASE

zclust_db(pt)

Any suggestios or any solution to find

Regards,

kiran rachamalla.