1. 相关查询连接数的命令

mysql>show variables like '%max_connections%';
+-------------------------+-----------------+
| Variable_name           | Value           |
+-------------------------+-----------------+
| extra_max_connections   |                 |
| max_connections         | 572             |
+-------------------------+-----------------+
返回行数:[2],耗时:3 ms.
mysql>select SUBSTRING_INDEX(host,':',1) as ip , count(*) from information_schema.processlist group by ip;
+----------------+--------------------+
| ip             | count(*)           |
+----------------+--------------------+
| 10.172.172.252 | 3                  |
| 10.24.190.26   | 2                  |
| 10.252.40.152  | 1                  |
| 10.44.33.0     | 2                  |
| 11.192.101.60  | 4                  |
| 113.47.233.165 | 4                  |
+----------------+--------------------+
返回行数:[6],耗时:2 ms.
mysql>show full processlist;
+--------------+-----------------+----------------------+-----------------+-------------------+----------------+-----------------+-----------------------+-----------------------+--------------------------------+------------------------+------------------------------+-------------------------------+--------------------------------+--------------------------------+-------------------------------+
| Id           | User            | Host                 | db              | Command           | Time           | State           | Info                  | Memory_used           | Memory_used_by_query           | Logical_read           | Physical_sync_read           | Physical_async_read           | Temp_user_table_size           | Temp_sort_table_size           | Temp_sort_file_size           |
+--------------+-----------------+----------------------+-----------------+-------------------+----------------+-----------------+-----------------------+-----------------------+--------------------------------+------------------------+------------------------------+-------------------------------+--------------------------------+--------------------------------+-------------------------------+
| 151531737    | chgg_dev        | 10.252.40.152:34428  | chgg_erp_dev    | Sleep             |              3 |                 |                       | 0                     | 8208                           | 57                     | 2                            | 0                             | 0                              | 0                              | 0                             |
| 151620590    | chgg_erp_prod   | 11.192.101.60:39350  | chgg_erp_prod   | Sleep             |             41 |                 |                       | 0                     | 8208                           | 0                      | 0                            | 0                             | 0                              | 0                              | 0                             |
| 168356902    | chgg_plant_prod | 10.24.190.26:33829   | chgg_plant_prod | Sleep             |              4 |                 |                       | 0                     | 8208                           | 422                    | 20                           | 0                             | 0                              | 0                              | 0                             |
| 168474692    | chgg_plant_prod | 113.47.233.165:39228 | chgg_plant_prod | Sleep             |            301 |                 |                       | 0                     | 8208                           | 145692                 | 3566                         | 580                           | 0                              | 0                              | 0                             |
| 168755874    | chgg_pmonitor   | 10.172.172.252:49211 | chgg-pmonitor   | Sleep             |              1 |                 |                       | 2204008               | 8208                           | 48178                  | 287                          | 0                             | 0                              | 0                              | 0                             |
| 202170433    | chgg_plant_prod | 113.47.233.165:39235 | chgg_plant_prod | Sleep             |            336 |                 |                       | 7512                  | 8208                           | 0                      | 0                            | 0                             | 0                              | 0                              | 0                             |
| 218187874    | chgg_plant_prod | 113.47.233.165:39240 | chgg_plant_prod | Sleep             |            338 |                 |                       | 0                     | 8208                           | 11                     | 5                            | 0                             | 0                              | 0                              | 0                             |
| 218973130    | chgg_erp_prod   | 11.192.101.60:39372  | chgg_erp_prod   | Query             |              0 | init            | show full processlist | 0                     | 8208                           | 0                      | 0                            | 0                             | 0                              | 0                              | 0                             |
| 537180277    | chgg_plant_prod | 113.47.233.165:39244 | chgg_plant_prod | Sleep             |            338 |                 |                       | 0                     | 8208                           | 0                      | 0                            | 0                             | 0                              | 0                              | 0                             |
| 537315291    | chgg_pmonitor   | 10.172.172.252:49210 | chgg-pmonitor   | Sleep             |              1 |                 |                       | 2201064               | 8208                           | 47574                  | 244                          | 0                             | 0                              | 0                              | 0                             |
| 537591682    | chgg_erp_prod   | 11.192.101.60:39234  | chgg_erp_prod   | Sleep             |              6 |                 |                       | 2240                  | 8208                           | 0                      | 0                            | 0                             | 0                              | 0                              | 0                             |
| 570439957    | chgg_dev        | 10.44.33.0:51664     | zentaopms       | Sleep             |              3 |                 |                       | 0                     | 8208                           | 45                     | 0                            | 0                             | 0                              | 0                              | 0                             |
| 571064761    | chgg_dev        | 10.44.33.0:50805     | zentaopms       | Sleep             |              7 |                 |                       | 2141656               | 8208                           | 2526                   | 9                            | 0                             | 0                              | 0                              | 0                             |
| 571127916    | chgg_pmonitor   | 10.172.172.252:49213 | chgg-pmonitor   | Sleep             |              1 |                 |                       | 2074416               | 8208                           | 48131                  | 295                          | 0                             | 0                              | 0                              | 0                             |
| 604379796    | chgg_plant_prod | 10.24.190.26:33830   | chgg_plant_prod | Sleep             |              4 |                 |                       | 0                     | 8208                           | 35                     | 0                            | 0                             | 0                              | 0                              | 0                             |
| 604656879    | chgg_erp_prod   | 11.192.101.60:39265  | chgg_erp_prod   | Sleep             |             49 |                 |                       | 208                   | 8208                           | 1189                   | 70                           | 0                             | 0                              | 0                              | 0                             |
+--------------+-----------------+----------------------+-----------------+-------------------+----------------+-----------------+-----------------------+-----------------------+--------------------------------+------------------------+------------------------------+-------------------------------+--------------------------------+--------------------------------+-------------------------------+
返回行数:[16],耗时:2 ms.
mysql>show processlist;
+--------------+-----------------+----------------------+-----------------+-------------------+----------------+-----------------+------------------+
| Id           | User            | Host                 | db              | Command           | Time           | State           | Info             |
+--------------+-----------------+----------------------+-----------------+-------------------+----------------+-----------------+------------------+
| 151531737    | chgg_dev        | 10.252.40.152:34428  | chgg_erp_dev    | Sleep             |              3 |                 |                  |
| 151620590    | chgg_erp_prod   | 11.192.101.60:39350  | chgg_erp_prod   | Sleep             |             41 |                 |                  |
| 168356902    | chgg_plant_prod | 10.24.190.26:33829   | chgg_plant_prod | Sleep             |              4 |                 |                  |
| 168474692    | chgg_plant_prod | 113.47.233.165:39228 | chgg_plant_prod | Sleep             |            301 |                 |                  |
| 168755874    | chgg_pmonitor   | 10.172.172.252:49211 | chgg-pmonitor   | Sleep             |              1 |                 |                  |
| 202170433    | chgg_plant_prod | 113.47.233.165:39235 | chgg_plant_prod | Sleep             |            336 |                 |                  |
| 218187874    | chgg_plant_prod | 113.47.233.165:39240 | chgg_plant_prod | Sleep             |            338 |                 |                  |
| 218973130    | chgg_erp_prod   | 11.192.101.60:39372  | chgg_erp_prod   | Query             |              0 | init            | show processlist |
| 537180277    | chgg_plant_prod | 113.47.233.165:39244 | chgg_plant_prod | Sleep             |            338 |                 |                  |
| 537315291    | chgg_pmonitor   | 10.172.172.252:49210 | chgg-pmonitor   | Sleep             |              1 |                 |                  |
| 537591682    | chgg_erp_prod   | 11.192.101.60:39234  | chgg_erp_prod   | Sleep             |              6 |                 |                  |
| 570439957    | chgg_dev        | 10.44.33.0:51664     | zentaopms       | Sleep             |              3 |                 |                  |
| 571064761    | chgg_dev        | 10.44.33.0:50805     | zentaopms       | Sleep             |              7 |                 |                  |
| 571127916    | chgg_pmonitor   | 10.172.172.252:49213 | chgg-pmonitor   | Sleep             |              1 |                 |                  |
| 604379796    | chgg_plant_prod | 10.24.190.26:33830   | chgg_plant_prod | Sleep             |              4 |                 |                  |
| 604656879    | chgg_erp_prod   | 11.192.101.60:39265  | chgg_erp_prod   | Sleep             |             49 |                 |                  |
+--------------+-----------------+----------------------+-----------------+-------------------+----------------+-----------------+------------------+
返回行数:[16],耗时:2 ms.

2. 修改my.ini/my.cnf配置文件的最大连接数相关配置(阿里云服务器无效,增加连接数需要花钱买)[mysqld]max_connections = 1000wait_timeout = 5

3.如何重启mysql(阿里云服务器无效,无法重启mysql)service mysqld restart/etc/inint.d/mysqld restart

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