mysql - Select from a big table with GROUP BY and ORDER BY -


i need top 30 ips period (month here) maximum sum of bytes.

select sum(bytes) bytes,  ip               table             stamp_inserted >= '2015-04-01 00:00:00'             group ip             order bytes desc             limit 30

table has 10 000 000+ records (will grow). type myisam.

i tryed add indexes bytes, ip, stamp_insered. , 1 index (complex index?).

explain says:

type: range key: stamp_inserted (complex index) rows: 6988465 extra: using where; using index; using temporary; using filesort

it takes 15 seconds. if remove order - 10 seconds. normal? or how can make faster?

table structure:

create table if not exists `all` (   `id` int(10) unsigned not null auto_increment,   `ip` char(15) not null,   `bytes` bigint(20) unsigned not null,   `stamp_inserted` datetime not null,   primary key (`id`),   key `ip` (`ip_dst`),   key `bytes` (`bytes`),   key `stamp_inserted` (`stamp_inserted`),   key `bytes_2` (`bytes`,`ip`,`stamp_inserted`) ) engine=myisam  default charset=utf8 auto_increment=11218827 ;


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