慢查询需要.0007s？为什么这是我的慢速日志？

Question

SELECT vt.vtid, vt.tag, vt.typeid, vt.id, vt.count, tt.type, u.username, vt.date_added, tc.context, tc.contextid
FROM ( vt, tt, u )
LEFT JOIN tc ON ( vt.vtid = tc.vtid AND tc.userid = vt.userid ) 
WHERE vt.typeid = tt.typeid
AND vt.verified =0
AND vt.userid = u.userid
ORDER BY vt.date_added DESC 
LIMIT 1

需要.0007才能完成

id   select_type     table   type    possible_keys           key             key_len         ref                         rows            Extra
1   SIMPLE          vt      ref     typeid,userid,verified  verified        1               const                       9               Using where; Using filesort
1   SIMPLE          tt      eq_ref  PRIMARY                 PRIMARY         4               vt.typeid       1   
1   SIMPLE          tc      ref     vtid                    vtid            4               vt.vtid         3    
1   SIMPLE          u       eq_ref  PRIMARY                 PRIMARY         4               vt.userid       1               Using where  

如何将此更改为不显示在慢查询日志中？

Answer 1

只是一个猜测.您可以设置log-queries-not-using-indexes标志.根据文档,即使使用索引,也可能导致查询以慢日志记录.