與正在20秒返回結果:(發送數據的時間太長,但指標AREADY創建
在表案件和cases_cstm查詢我有問題,我有96萬行
這是我的查詢:
SELECT cases.id ,cases_cstm.assunto_c, cases.name , cases.case_number ,
cases.priority , accounts.name account_name ,
accounts.assigned_user_id account_name_owner ,
'Accounts' account_name_mod, cases.account_id ,
LTRIM(RTRIM(CONCAT(IFNULL(jt1.first_name,''),' ',IFNULL(jt1.last_name,'')))) assigned_user_name ,
jt1.created_by assigned_user_name_owner ,
'Users' assigned_user_name_mod, cases.status , cases.date_entered ,
cases.assigned_user_id
FROM cases
LEFT JOIN cases_cstm ON cases.id = cases_cstm.id_c
LEFT JOIN accounts accounts ON
cases.account_id=accounts.id AND accounts.deleted=0 AND
accounts.deleted=0
LEFT JOIN users jt1 ON
cases.assigned_user_id=jt1.id AND
jt1.deleted=0 AND jt1.deleted=0
where
(((LTRIM(RTRIM(CONCAT(IFNULL(accounts.name,'')))) LIKE 'rodrigo fernando%' OR
LTRIM(RTRIM(CONCAT(IFNULL(accounts.name,'')))) LIKE 'rodrigo fernando%'))) AND
cases.deleted=0 ORDER BY cases.date_entered DESC LIMIT 0,11;
這裏是表的索引:
+-------+------------+--------------------+--------------+------------------
+-----------+-------------+----------+--------+------+------------+--------
| Table | Non_unique | Key_name | Seq_in_index | Column_name |Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment
+-------+------------+--------------------+--------------+------------------
+-----------+-------------+----------+--------+------+------------+---------
| cases | 0 | PRIMARY | 1 | id | A | 911472 | NULL | NULL | | BTREE |
| cases | 0 | case_number | 1 | case_number | A | 911472 | NULL | NULL | | BTREE |
|
| cases | 1 | idx_case_name | 1 | name | A | 911472 | NULL | NULL | YES | BTREE |
|
| cases | 1 | idx_account_id | 1 | account_id | A | 455736 | NULL | NULL | YES | BTREE |
|
| cases | 1 | idx_cases_stat_del | 1 | assigned_user_id| A | 106 | NULL | NULL | YES | BTREE |
|
| cases | 1 | idx_cases_stat_del | 2 | status | A | 197 | NULL | NULL | YES | BTREE |
|
| cases | 1 | idx_cases_stat_del | 3 | deleted | A | 214 | NULL | NULL | YES | BTREE |
|
| cases | 1 | idx_priority | 1 | priority | A | 455736 | NULL | NULL | YES | BTREE |
|
| cases | 1 | idx_date_entered | 1 | date_entered| A | 455736 | NULL | NULL | YES | BTREE |
+-------+------------+--------------------+--------------+------------------
+-----------+-------------+----------+--------+------+------------+---------
The Explain command of query(Image!)
這是查詢執行的個人資料:
+--------------------+-----------+
| Status | Duration |
+--------------------+-----------+
| starting | 0.000122 |
| Opening tables | 0.000180 |
| System lock | 0.000005 |
| Table lock | 0.000005 |
| init | 0.000051 |
| optimizing | 0.000017 |
| statistics | 0.000071 |
| preparing | 0.000021 |
| executing | 0.000003 |
| Sorting result | 0.000004 |
| Sending data | 21.595455 |
| end | 0.000012 |
| query end | 0.000002 |
| freeing items | 0.000419 |
| logging slow query | 0.000005 |
| logging slow query | 0.000002 |
| cleaning up | 0.000004 |
有人可以幫助我undertang爲什麼查詢花費這麼長時間來執行呢?
謝謝!
你有很多的函數調用where子句,可能是這個問題 – blueCat
像往常一樣,Profile說無用的「發送數據」。 –
這不應該花20秒。其他事情正在發生。請提供'SHOW CREATE TABLE cases'。 –