Hello, 

I am planning to enable acc cdr in my kamailio 4.1 server.

I am testing in my lab and it is working fine.

However, when I check the table definition I see this:

mysql> describe acc_cdrs;

+------------+------------------+------+-----+---------+----------------+

| Field      | Type             | Null | Key | Default | Extra          |

+------------+------------------+------+-----+---------+----------------+

| id         | int(10) unsigned | NO   | PRI | NULL    | auto_increment |

| start_time | varchar(32)      | NO   | MUL |         |                |

| end_time   | varchar(32)      | NO   |     |         |                |

| duration   | varchar(32)      | NO   |     |         |                |

+------------+------------------+------+-----+---------+----------------+

4 rows in set (0.00 sec)

The *_time and duration columns are defined as varchar.

Because of this, i need to perform a cast when doing queries:

  select * from acc_cdrs where cast(start_time as unsigned) >= 1437120622;

which would cause extra processing in the db server.

So I experimented changing these columns to "int unsigned" and to "float unsigned" and it worked for both without problems (records properly added to acc_cdrs and no errors in kamailio.log):

alter table acc_cdrs modify start_time int unsigned;

alter table acc_cdrs modify end_time int unsigned;

alter table acc_cdrs modify duration int unsigned;

alter table acc_cdrs modify start_time float unsigned;

alter table acc_cdrs modify end_time float unsigned;

alter table acc_cdrs modify duration float unsigned;

So I am thinking in doing this in my production server but I would like to know if there is any potential risk of doing this (as I am not sure why it was decided for these fields to be varchar instead of a numeric type).

Regards,

Takeshi