Purging Table Which Is Having 98 M Rows

I want to purge a table which is having more then 98M rows...here are the details...

Purge Process I followed
---------------------------------------------
Step 1. Created backup table from Main table with required data only
create table abc_98M_purge as
select * from abc_98M where trunc(tran_date)>='01-jul-2011'
-> table created with 5325411 rows

Step 2. truncate table abc_98M

Step 3. inserted all 5325411 rows back to abc_98M from abc_98M_purge using below procedure

DECLARE
TYPE ARRROWID IS TABLE OF ROWID INDEX BY BINARY_INTEGER;
tbrows ARRROWID;
row PLS_INTEGER;
cursor cur_insert is select rowid from abc_98M_purge order by rowid;
BEGIN
open cur_insert;
loop
[code]....