index creation taking too much time

["Ananda Kumar" <anandkl@xxxxxxxxx>]

Hi All,
We have a table which is around 100 Million rows. Its a myisam table, but
the db default is innodb.
CREATE TABLE `dc_data` (
  `id` decimal(22,0) NOT NULL,
  `words` varchar(255) NOT NULL,
  `lf_id` decimal(22,0) NOT NULL,
  `occurence` bigint(20) NOT NULL,
  `date_modified` timestamp NULL default CURRENT_TIMESTAMP on update
CURRENT_TIMESTAMP) ENGINE=MyIsam DEFAULT CHARSET=utf8


indexs are as below

PRIMARY KEY  (`id`),
  KEY `KI_IDX_0805090456` (`words`,`id`),
  KEY `CI_IDX_0805090456` (`lf_id`)

we have 8 cpu, 8 gb ram.
We use set below parameters at session level

myisam_sort_buffer_size=300MB
myisam_max_sort_file_size=10GB

Each index creation is taking 10hrs, is there any way i can speed up index
creation.

regards
anandkl