mysql 卡住_一次sql卡住的解决过程（mysql）
一条更新语句，导致数据库卡死，但从OS层面看没有数据库负载
update wlflow.`crm_fm_result_info` set result_status = '已取消',end_date = '2016-07-31 23:59:59',bak2 = '20160805数据对比联通侧无订购'
WHERE `prod_rowid` = '144' AND `result_status` = '成功'
AND `create_date` > '2016-05-08 15:30' AND `create_date` < '2016-08-01'
AND `phone` NOT IN (
SELECT phone FROM report.`ltspfb_20160805`)
进程列表中卡住的sql已经执行了9万多(96309)秒了
mysql> show full processlist;
+-----------+--------------+---------------------+--------+---------+-------+-------+-----------------------+-----------+---------------+
| Id | User | Host | db | Command | Time | State | Info | Rows_sent | Rows_examined |
+-----------+--------------+---------------------+--------+---------+-------+-------+-----------------------+-----------+---------------+
| 104716330 | ssx_dbmanage | 10.25.251.101:47720 | wlflow | Sleep | 21082 | | NULL | 1 | 0 |
| 104723084 | ssx_dbmanage | 10.25.251.101:48246 | wlflow | Sleep | 9832 | | NULL | 1 | 0 |
| 104724995 | ssx_dbmanage | 10.25.251.101:55815 | wlflow | Sleep | 972 | | NULL | 1 | 0 |
| 104725661 | report_sc | 10.25.20.16:64246 | report | Query | 96309| | update wlflow.`crm_fm_result_info` set result_status = '已取消',end_date = '2016-07-31 23:59:59',bak2 = '20160805数据对比联通侧无订购'
WHERE `prod_rowid` = '144' AND `result_status` = '成功'
AND `create_date` > '2016-05-08 15:30' AND `create_date` < '2016-08-01'
AND `phone` NOT IN (
SELECT phone FROM report.`ltspfb_20160805`) | 1 | 0 |
1千2百万条数据
mysql> show table status like 'crm_fm_result_info';
+--------------------+--------+---------+------------+----------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
| Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment |
+--------------------+--------+---------+------------+----------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
| crm_fm_result_info | InnoDB | 10 | Compact |11676615| 219 | 2564784128 | 0 | 3132653568 | 7340032 | 12082756 | 2016-06-17 17:16:56 | NULL | NULL | utf8_general_ci | NULL | | |
+--------------------+--------+---------+------------+----------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
1 row in set
子表：1百5十4万条数据
mysql> show table status like 'ltspfb_20160805';
+-----------------+--------+---------+------------+---------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
| Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment |
+-----------------+--------+---------+------------+---------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
| ltspfb_20160805 | InnoDB | 10 | Compact |1543803| 40 | 62488576 | 0 | 0 | 4194304 | NULL | 2016-08-05 15:20:02 | NULL | NULL | utf8_general_ci | NULL | | |
+-----------------+--------+---------+------------+---------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
1 row in set
mysql> SHOW INDEX FROM report.ltspfb_20160805;
+-----------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-----------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| ltspfb_20160805 | 1 | phone | 1 | phone | A | 1543803 | NULL | NULL | YES | BTREE | | |
+-----------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
1 row in set
mysql> show index from wlflow.crm_fm_result_info;
+--------------------+------------+---------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+--------------------+------------+---------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| crm_fm_result_info | 0 | PRIMARY | 1 | rowid | A | 10535978 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | phone | 1 | phone | A | 10535978 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | result_status | 1 | result_status | A | 3222 | NULL | NULL | YES | BTREE | | |
| crm_fm_result_info | 1 | end_date | 1 | end_date | A | 2633994 | NULL | NULL | YES | BTREE | | |
| crm_fm_result_info | 1 | bak5 | 1 | bak5 | A | 1505139 | 255 | NULL | YES | BTREE | | |
| crm_fm_result_info | 1 | start_date | 1 | start_date | A | 10535978 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | phone_2 | 1 | phone | A | 10535978 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | phone_2 | 2 | prod_rowid | A | 10535978 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | phone_2 | 3 | result_status | A | 10535978 | NULL | NULL | YES | BTREE | | |
| crm_fm_result_info | 1 | prod_rowid_2 | 1 | prod_rowid | A | 26208 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | prod_rowid_2 | 2 | cust_id | A | 10535978 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | prod_rowid_2 | 3 | end_date | A | 10535978 | NULL | NULL | YES | BTREE | | |
| crm_fm_result_info | 1 | prod_rowid | 1 | prod_rowid | A | 16566 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | prod_rowid | 2 | create_date | A | 10535978 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | prod_rowid | 3 | result_status | A | 10535978 | NULL | NULL | YES | BTREE | | |
| crm_fm_result_info | 1 | phone_3 | 1 | phone | A | 10535978 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | phone_3 | 2 | prod_rowid | A | 10535978 | NULL | NULL | | BTREE | | |
| crm_fm_result_info | 1 | phone_3 | 3 | result_status | A | 10535978 | NULL | NULL | YES | BTREE | | |
| crm_fm_result_info | 1 | phone_3 | 4 | create_date | A | 10535978 | NULL | NULL | | BTREE | | |
+--------------------+------------+---------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
19 rows in set
改成select看解析计划
mysql> explain select count(1)
from wlflow.`crm_fm_result_info` a
WHERE `prod_rowid` = '144' AND `result_status` = '成功'
AND `create_date` > '2016-05-08 15:30' AND `create_date` < '2016-08-01'
AND phone not in (
SELECT phone FROM report.`ltspfb_20160805` b ) ;
+----+-------------+-------+-------+---------------------------------------+---------------+---------+-------+---------+------------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+-------+---------------------------------------+---------------+---------+-------+---------+------------------------------------+
| 1 | PRIMARY | a | ref | result_status,prod_rowid_2,prod_rowid | result_status | 303 | const | 5835987 | Using index condition; Using where |
| 2 | SUBQUERY | b | index | phone | phone | 303 | NULL | 1543803 | Using index |
+----+-------------+-------+-------+---------------------------------------+---------------+---------+-------+---------+------------------------------------+
2 rows in set
改成关联查询：(要求B表中phone唯一)
mysql> explain select count(1)
from wlflow.`crm_fm_result_info` a,report.`ltspfb_20160805` b
WHERE a.`phone` = b.`phone`
and `prod_rowid` = '144' AND `result_status` = '成功'
AND `create_date` > '2016-05-08 15:30' AND `create_date` < '2016-08-01';
+----+-------------+-------+-------+-----------------------------------------------------+-------+---------+----------------+---------+--------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+-------+-----------------------------------------------------+-------+---------+----------------+---------+--------------------------+
| 1 | SIMPLE | b | index | phone | phone | 303 | NULL | 1543803 | Using where; Using index |
| 1 | SIMPLE | a | ref | phone,result_status,phone_2,prod_rowid_2,prod_rowid | phone | 302 | report.b.phone | 1 | Using where |
+----+-------------+-------+-------+-----------------------------------------------------+-------+---------+----------------+---------+--------------------------+
2 rows in set
mysql 建索引 是锁表的，可以用一下shell命令
改造后台的SQL如下：
update wlflow.`crm_fm_result_info` a,report.`ltspfb_20160805` b
set a.result_status = '已取消',
a.end_date = '2016-07-31 23:59:59',
a.bak2 = '20160805数据对比联通侧无订购'
WHERE a.`phone` = b.`phone`
and `prod_rowid` = '144' AND `result_status` = '成功'
AND `create_date` > '2016-05-08 15:30'
AND `create_date` < '2016-08-01';
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