Bind with mysql backend

[Mike Ragusa]

I have been using the default schema with bind-dlz and mysql as noted on
their website. I was wondering what people use to manage this information
and if they used another database schema that offered better performance or
ablity to manage the data better.
Default Schema:
+-------------+------------+------+-----+---------+-------+
| Field       | Type       | Null | Key | Default | Extra |
+-------------+------------+------+-----+---------+-------+
| zone        | text       | YES  | MUL | NULL    |       |
| host        | text       | YES  | MUL | NULL    |       |
| type        | text       | YES  | MUL | NULL    |       |
| data        | text       | YES  |     | NULL    |       |
| ttl         | int(11)    | NO   |     | 3600    |       |
| mx_priority | text       | YES  |     | NULL    |       |
| refresh     | int(11)    | YES  |     | NULL    |       |
| retry       | int(11)    | YES  |     | NULL    |       |
| expire      | int(11)    | YES  |     | NULL    |       |
| minimum     | int(11)    | YES  |     | NULL    |       |
| serial      | bigint(20) | YES  |     | NULL    |       |
| resp_person | text       | YES  |     | NULL    |       |
| primary_ns  | text       | YES  |     | NULL    |       |
+-------------+------------+------+-----+---------+-------+


Default MySQL for named.conf:

dlz "Mysql zone" {
   database "mysql
   {host=localhost dbname=dns user=dns pass=bind-dlz-test}
   {select zone from dns_records where zone = '%zone%'}
   {select ttl, type, mx_priority, case when lower(type)='txt' then
concat('\"', data, '\"')
        when lower(type) = 'soa' then concat_ws(' ', data, resp_person,
serial, refresh, retry, expire, minimum)
        else data end from dns_records where zone = '%zone%' and host =
'%record%'}
   {}
   {select ttl, type, host, mx_priority, case when lower(type)='txt' then
        concat('\"', data, '\"') else data end, resp_person, serial,
refresh, retry, expire,
        minimum from dns_records where zone = '%zone%'}
   {select zone from xfr_table where zone = '%zone%' and client =
'%client%'}";
};