extent size of the table

Hi All ! I need to clarify a small doubt about row size and index size while calculating the extent size and next extent size for a table. Following is a output of dbschema for a table in a said database. Now how the sysetm calculated the index size? If I manually calculated that is index size for the followin table = (10+9+4)+8+25%overhead is comes to 37. any suggestions please.. thanks in advance Rama { TABLE "crs".unvalidated_t_trn row size = 124 number of columns = 7 index size= 40 } create table "crs".unvalidated_t_trn ( nbr_crs_control char(10) not null, nbr_trn char(9) not null, nbr_branch char(4) not null, txt_lnam_ind char(30) not null, txt_fnam_ind char(20), txt_mnam_ind char(10), txt_addr_mark varchar(40), primary key (nbr_crs_control,nbr_trn,nbr_branch) constraint "crs".u106_4 ); revoke all on "crs".unvalidated_t_trn from "public"; ____________________________________________________________________ Get free e-mail and a permanent address at http://www.netaddress.com/?N=1