Many thanks for Heitor Faria(Mr./Ms.) and Randoslaw
Koreniewski(Mr./Ms)
Mysql DB was MyISAM therefore changed to InnoDB.
and also inserted few lines as suggested on http://bacula.us/tuning/
as follows
     sort_buffer_size = 2MB
     innodb_buffer_pool_size = 128MB
     innodb_flush_log_at_trx_commit = 0
     innodb_flush_method = O_DIRECT
then "Bulding directory tree" finish almost immidiatly.
FYI following case take only less than 30seconds
+-------+-------+----------+---------------+---------------------+------------+
| JobId | Level | JobFiles | JobBytes      | StartTime           |
VolumeName |
+-------+-------+----------+---------------+---------------------+------------+
|     4 | F     |  258,441 | 2,262,481,683 | 2015-07-02 14:32:50 |
Vol-0004   |
|    14 | I     |      158 |    79,623,411 | 2015-07-03 04:32:49 |
Vol-0014   |
+-------+-------+----------+---------------+---------------------+------------+
Thanks again for the help.
F.Otake



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