很慢我有以下結構的MySQL表:Mysql的InnoDB的是SELECT查詢
mysql> show create table logs \G;
Create Table: CREATE TABLE `logs` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`request` text,
`response` longtext,
`msisdn` varchar(255) DEFAULT NULL,
`username` varchar(255) DEFAULT NULL,
`shortcode` varchar(255) DEFAULT NULL,
`response_code` varchar(255) DEFAULT NULL,
`response_description` text,
`transaction_name` varchar(250) DEFAULT NULL,
`system_owner` varchar(250) DEFAULT NULL,
`request_date_time` datetime DEFAULT NULL,
`response_date_time` datetime DEFAULT NULL,
`comments` text,
`user_type` varchar(255) DEFAULT NULL,
`channel` varchar(20) DEFAULT 'WEB',
/**
other columns here....
other 18 columns here, with Type varchar and Text
**/
PRIMARY KEY (`id`),
KEY `transaction_name` (`transaction_name`) USING BTREE,
KEY `msisdn` (`msisdn`) USING BTREE,
KEY `username` (`username`) USING BTREE,
KEY `request_date_time` (`request_date_time`) USING BTREE,
KEY `system_owner` (`system_owner`) USING BTREE,
KEY `shortcode` (`shortcode`) USING BTREE,
KEY `response_code` (`response_code`) USING BTREE,
KEY `channel` (`channel`) USING BTREE,
KEY `request_date_time_2` (`request_date_time`),
KEY `response_date_time` (`response_date_time`)
) ENGINE=InnoDB AUTO_INCREMENT=59582405 DEFAULT CHARSET=utf8
和它有超過3000條記錄。
mysql> select count(*) from logs;
+----------+
| count(*) |
+----------+
| 38962312 |
+----------+
1 row in set (1 min 17.77 sec)
現在的問題是,這是很慢的選擇結果需要年齡從表中提取記錄。
我下面的子查詢需要近30分鐘,取一天記錄:
SELECT
COUNT(sub.id) AS count,
DATE(sub.REQUEST_DATE_TIME) AS transaction_date,
sub.SYSTEM_OWNER,
sub.transaction_name,
sub.response,
MIN(sub.response_time),
MAX(sub.response_time),
AVG(sub.response_time),
sub.channel
FROM
(SELECT
id,
REQUEST_DATE_TIME,
RESPONSE_DATE_TIME,
TIMESTAMPDIFF(SECOND, REQUEST_DATE_TIME, RESPONSE_DATE_TIME) AS response_time,
SYSTEM_OWNER,
transaction_name,
(CASE
WHEN response_code IN ('0' , '00', 'EIL000') THEN 'Success'
ELSE 'Failure'
END) AS response,
channel
FROM
logs
WHERE
response_code != ''
AND DATE(REQUEST_DATE_TIME) BETWEEN '2016-10-26 00:00:00' AND '2016-10-27 00:00:00'
AND SYSTEM_OWNER != '') sub
GROUP BY DATE(sub.REQUEST_DATE_TIME) , sub.channel , sub.SYSTEM_OWNER , sub.transaction_name , sub.response
ORDER BY DATE(sub.REQUEST_DATE_TIME) DESC , sub.SYSTEM_OWNER , sub.transaction_name , sub.response DESC;
我還添加索引到我的表,但它仍然是非常緩慢的。
任何幫助我如何使它快速?
編輯: 然使用EXPLAIN
+----+-------------+------------+------+----------------------------+------+---------+------+----------+---------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+------------+------+----------------------------+------+---------+------+----------+---------------------------------+
| 1 | PRIMARY | <derived2> | ALL | NULL | NULL | NULL | NULL | 16053297 | Using temporary; Using filesort |
| 2 | DERIVED | logs | ALL | system_owner,response_code | NULL | NULL | NULL |6592 | Using where |
+----+-------------+------------+------+----------------------------+------+---------+------+----------+---------------------------------+
你需要更好地看看你的索引。我想這需要一點時間才能發現 - 因爲你有很多地點/組/訂單標準,你將需要跨越多個列。我假設你已經運行了一個'EXPLAIN'來看看它在掙扎着什麼? – calcinai
您可以嘗試的一件事是將'AND DATE(REQUEST_DATE_TIME)'2016-10-26 00:00:00'和'2016-10-27 00:00:00''更改爲'AND REQUEST_DATE_TIME>'2016-10 -26'AND REQUEST_DATE_TIME <'2016-10-27'' –
另一件值得注意的事情是,默認情況下,InnoDB沒有被分配太多資源。你知道你的使用是什麼嗎? – calcinai