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MySQL，查看连接数和状态等
1、MySQL> show status like ‘%connect%‘;
Connections，试图连接到（不管是否成功）MySQL服务器的连接数。
Max_used_connections，服务器启动后已经同时使用的连接的最大数量。
Threads_connected，当前的连接数。
2、mysql> show variables like ‘%connect%‘;
max_connections，最大连接数。
3、修改max_connections
在配置文件（my.cnf或my.ini）在最下面，天加一句：
max_connections=32000
然后，用命令重启：/etc/init.d/mysqld restart
虽然这里写的32000，实际MySQL服务器允许的最大连接数16384；
添加了最大允许连接数，对系统消耗增加不大。
4、mysql> show processlist;
显示当前正在执行的MySQL连接。
mysql> show status like ‘%connect%‘; +-----------------------------------------------+-------+| Variable_name | Value |+-----------------------------------------------+-------+| Aborted_connects | 2 || Connection_errors_accept | 0 || Connection_errors_internal | 0 || Connection_errors_max_connections | 0 || Connection_errors_peer_address | 0 || Connection_errors_select | 0 || Connection_errors_tcpwrap | 0 || Connections | 445 || Max_used_connections | 61 || Performance_schema_session_connect_attrs_lost | 0 || Ssl_client_connects | 0 || Ssl_connect_renegotiates | 0 || Ssl_finished_connects | 0 || Threads_connected | 57 |+-----------------------------------------------+-------+14 rows in set (0.00 sec)mysql> show variables like ‘%connect%‘; +-----------------------------------------------+-----------------+| Variable_name | Value |+-----------------------------------------------+-----------------+| character_set_connection | utf8 || collation_connection | utf8_general_ci || connect_timeout | 10 || disconnect_on_expired_password | ON || init_connect | || max_connect_errors | 100 || max_connections | 151 || max_user_connections | 0 || performance_schema_session_connect_attrs_size | 512 |+-----------------------------------------------+-----------------+9 rows in set (0.00 sec)mysql> show processlist; +-----+------+---------------------+------+---------+------+-------+------------------+| Id | User | Host | db | Command | Time | State | Info |+-----+------+---------------------+------+---------+------+-------+------------------+| 315 | srea | 192.168.0.206:58566 | srea | Sleep | 3370 | | NULL || 316 | srea | 192.168.0.206:58567 | srea | Sleep | 3370 | | NULL || 317 | srea | 192.168.0.206:58568 | srea | Sleep | 3370 | | NULL || 318 | srea | 192.168.0.206:58569 | srea | Sleep | 3370 | | NULL || 319 | srea | 192.168.0.206:58570 | srea | Sleep | 3370 | | NULL || 320 | srea | 192.168.0.206:58572 | srea | Sleep | 3370 | | NULL || 321 | srea | 192.168.0.206:58575 | srea | Sleep | 3370 | | NULL || 322 | srea | 192.168.0.206:58576 | srea | Sleep | 3370 | | NULL || 323 | srea | 192.168.0.206:58577 | srea | Sleep | 3370 | | NULL || 324 | srea | 192.168.0.206:58578 | srea | Sleep | 3370 | | NULL || 325 | srea | 192.168.0.206:58579 | srea | Sleep | 3370 | | NULL || 326 | srea | 192.168.0.206:58581 | srea | Sleep | 3370 | | NULL || 327 | srea | 192.168.0.206:58582 | srea | Sleep | 3370 | | NULL || 328 | srea | 192.168.0.206:58583 | srea | Sleep | 3370 | | NULL || 329 | srea | 192.168.0.206:58586 | srea | Sleep | 3370 | | NULL || 330 | srea | 192.168.0.206:58587 | srea | Sleep | 3370 | | NULL || 331 | srea | 192.168.0.206:58589 | srea | Sleep | 3370 | | NULL || 332 | srea | 192.168.0.206:58590 | srea | Sleep | 3370 | | NULL || 334 | srea | 192.168.0.206:59012 | srea | Sleep | 2920 | | NULL || 335 | srea | 192.168.0.206:59342 | srea | Sleep | 2487 | | NULL || 336 | srea | 192.168.0.206:59343 | srea | Sleep | 2545 | | NULL || 337 | srea | 192.168.0.206:59344 | srea | Sleep | 2545 | | NULL || 338 | srea | 192.168.0.206:59345 | srea | Sleep | 2545 | | NULL || 339 | srea | 192.168.0.206:59346 | srea | Sleep | 2545 | | NULL || 340 | srea | 192.168.0.206:59347 | srea | Sleep | 2545 | | NULL || 341 | srea | 192.168.0.206:59348 | srea | Sleep | 2545 | | NULL || 342 | srea | 192.168.0.206:59349 | srea | Sleep | 2544 | | NULL || 343 | srea | 192.168.0.206:59350 | srea | Sleep | 2544 | | NULL || 344 | srea | 192.168.0.206:59351 | srea | Sleep | 2544 | | NULL || 345 | srea | 192.168.0.206:59352 | srea | Sleep | 2544 | | NULL || 346 | srea | 192.168.0.206:59353 | srea | Sleep | 2544 | | NULL || 347 | srea | 192.168.0.206:59354 | srea | Sleep | 2544 | | NULL || 348 | srea | 192.168.0.206:59355 | srea | Sleep | 2544 | | NULL || 349 | srea | 192.168.0.206:59356 | srea | Sleep | 2544 | | NULL || 350 | srea | 192.168.0.206:59357 | srea | Sleep | 2544 | | NULL || 351 | srea | 192.168.0.206:59358 | srea | Sleep | 2544 | | NULL || 353 | srea | 192.168.0.206:59341 | srea | Sleep | 2503 | | NULL || 354 | srea | 192.168.0.206:59340 | srea | Sleep | 2486 | | NULL || 418 | srea | 192.168.0.206:52115 | srea | Sleep | 643 | | NULL || 419 | srea | 192.168.0.206:52140 | srea | Sleep | 717 | | NULL || 420 | srea | 192.168.0.206:52145 | srea | Sleep | 717 | | NULL || 421 | srea | 192.168.0.206:52148 | srea | Sleep | 717 | | NULL || 422 | srea | 192.168.0.206:52151 | srea | Sleep | 717 | | NULL || 423 | srea | 192.168.0.206:52154 | srea | Sleep | 717 | | NULL || 424 | srea | 192.168.0.206:52157 | srea | Sleep | 717 | | NULL || 425 | srea | 192.168.0.206:52159 | srea | Sleep | 716 | | NULL || 426 | srea | 192.168.0.206:52160 | srea | Sleep | 716 | | NULL || 427 | srea | 192.168.0.206:52161 | srea | Sleep | 716 | | NULL || 428 | srea | 192.168.0.206:52164 | srea | Sleep | 716 | | NULL || 429 | srea | 192.168.0.206:52167 | srea | Sleep | 716 | | NULL || 430 | srea | 192.168.0.206:52169 | srea | Sleep | 716 | | NULL || 431 | srea | 192.168.0.206:52172 | srea | Sleep | 716 | | NULL || 432 | srea | 192.168.0.206:52175 | srea | Sleep | 716 | | NULL || 433 | srea | 192.168.0.206:52179 | srea | Sleep | 716 | | NULL || 436 | srea | 192.168.0.206:52114 | srea | Sleep | 668 | | NULL || 437 | srea | 192.168.0.206:52112 | srea | Sleep | 641 | | NULL || 444 | root | localhost | NULL | Query | 0 | init | show processlist |+-----+------+---------------------+------+---------+------+-------+------------------+57 rows in set (0.00 sec)
MySQL，查看连接数和状态等
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