Mysql ERROR 1040 (HY000): Too many connections解决

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1、问题描述：连接数据库出现Too Many Connections 错误，

2、问题定位步骤：

1、mysql -u root -p 进入不了，同样出现上述错误。

2、修改/etc/mysql/my.cnf（ubuntu系统，其他系统在/etc/my.cnf

[mysqld]

port=3306

#socket=MySQL

skip-locking

set-variable = key_buffer=16K

set-variable = max_allowed_packet=1M

set-variable = thread_stack=64K

set-variable = table_cache=4

set-variable = sort_buffer=64K

set-variable = net_buffer_length=2K

set-variable = max_connections=1000

3、重启mysql /etc/init.d/mysql restart

搞定了。

4、还有一个方法就是直接 /etc/init.d/mysql restart 在做连接操作，呵呵，这个不好。

续：

再次mysql -u root -p 进入系统，如下，大部分的连接其实已经Sleep了，那么如何控制释放这些空闲连接，

mysql的默认连接上只有100，也就是说连接数据超过100 就会有可能出现 Too Many Connections

修改my.cnf配置文件添加并需要重启：

[mysqld]

wait_timeout = 600

interactive_timeout = 600

上面的意思是设置10分钟内该连接没有请求就断开，当然你也可以通过kill掉下面的process的。命令是 kill ${id} 比如下面的19684 进程 kill 19684。

[sql]

mysql> show full processlist;

+-------+----------------------+-----------------------------+------+---------+------+-------+-----------------------+

+-------+----------------------+-----------------------------+------+---------+------+-------+-----------------------+

| 19684 | root | AY130121082434a.local:59618 | fo | Sleep | 7028 | | NULL |

| 19691 | root | AY130121082434a.local:59888 | mo | Sleep | 6121 | | NULL |

| 19709 | root | AY130121082434a.local:60339 | fo | Sleep | 7272 | | NULL |

| 19708 | root | AY130121082434a.local:60338 | fo | Sleep | 6672 | | NULL |

| 19710 | root | 222.95.56.226:4883 | fo | Sleep | 7263 | | NULL |

| 19711 | root | 222.95.56.226:4884 | fo | Sleep | 7263 | | NULL |

| 19712 | root | 222.95.56.226:4885 | fo | Sleep | 7264 | | NULL |

| 19713 | root | 222.95.56.226:4886 | fo | Sleep | 7264 | | NULL |

| 19714 | root | 222.95.56.226:4887 | fo | Sleep | 7265 | | NULL |

| 19715 | root | 222.95.56.226:4888 | fo | Sleep | 7261 | | NULL |

| 19716 | root | 222.95.56.226:4889 | fo | Sleep | 7256 | | NULL |

| 19717 | root | 222.95.56.226:4891 | fo | Sleep | 7250 | | NULL |

| 19718 | root | 222.95.56.226:4899 | fo | Sleep | 7246 | | NULL |

| 19719 | root | 222.95.56.226:4900 | fo | Sleep | 3669 | | NULL |

| 19720 | root | 222.95.56.226:4901 | fo | Sleep | 3035 | | NULL |

| 19721 | root | 222.95.56.226:4904 | fo | Sleep | 7231 | | NULL |

| 19722 | root | 222.95.56.226:4909 | fo | Sleep | 7226 | | NULL |

| 19723 | root | 222.95.56.226:4910 | fo | Sleep | 7221 | | NULL |

| 19724 | root | 222.95.56.226:4912 | fo | Sleep | 7216 | | NULL |

| 19725 | root | 222.95.56.226:4913 | fo | Sleep | 7211 | | NULL |

| 19726 | root | 222.95.56.226:4914 | fo | Sleep | 7206 | | NULL |

| 19727 | root | 222.95.56.226:4915 | fo | Sleep | 7200 | | NULL |

| 19728 | root | 222.95.56.226:4916 | fo | Sleep | 3034 | | NULL |

| 19729 | root | 222.95.56.226:4918 | fo | Sleep | 3115 | | NULL |

| 19730 | root | AY130121082434a.local:60622 | mo | Sleep | 6121 | | NULL |

| 19731 | root | AY130121082434a.local:60623 | fo | Sleep | 6672 | | NULL |

| 19732 | root | AY130121082434a.local:60692 | fo | Sleep | 6547 | | NULL |

| 19733 | root | AY130121082434a.local:60693 | fo | Sleep | 6547 | | NULL |

| 19734 | root | AY130121082434a.local:60694 | fo | Sleep | 6305 | | NULL |

| 19735 | root | AY130121082434a.local:60695 | fo | Sleep | 6547 | | NULL |

| 19736 | root | AY130121082434a.local:60791 | mo | Sleep | 5713 | | NULL |

| 19737 | root | AY130121082434a.local:60792 | mo | Sleep | 5713 | | NULL |

| 19738 | root | AY130121082434a.local:60793 | fo | Sleep | 5823 | | NULL |

| 19739 | root | AY130121082434a.local:60794 | fo | Sleep | 5823 | | NULL |

| 19756 | root | AY130121082434a.local:60875 | mo | Sleep | 5249 | | NULL |

| 19755 | root | AY130121082434a.local:60874 | mo | Sleep | 5249 | | NULL |

| 19758 | root | AY130121082434a.local:60877 | fo | Sleep | 5342 | | NULL |

| 19757 | root | AY130121082434a.local:60876 | fo | Sleep | 5647 | | NULL |

| 19759 | root | AY130121082434a.local:60878 | fo | Sleep | 5342 | | NULL |

| 19771 | root | AY130121082434a.local:60923 | mo | Sleep | 4767 | | NULL |

| 19772 | root | AY130121082434a.local:60924 | mo | Sleep | 4767 | | NULL |

| 19773 | root | AY130121082434a.local:60926 | fo | Sleep | 3897 | | NULL |

| 19774 | root | AY130121082434a.local:60927 | fo | Sleep | 3175 | | NULL |

| 19775 | root | AY130121082434a.local:60998 | mo | Sleep | 4454 | | NULL |

| 19776 | root | AY130121082434a.local:60999 | mo | Sleep | 4454 | | NULL |

| 19777 | root | AY130121082434a.local:32913 | mo | Sleep | 4307 | | NULL |

| 19778 | root | AY130121082434a.local:32914 | mo | Sleep | 4307 | | NULL |

| 19779 | root | AY130121082434a.local:32915 | mo | Sleep | 4307 | | NULL |

| 19780 | root | AY130121082434a.local:32916 | mo | Sleep | 3387 | | NULL |

| 19781 | root | AY130121082434a.local:32957 | mo | Sleep | 1365 | | NULL |

| 19801 | root | AY130121082434a.local:33110 | mo | Sleep | 1365 | | NULL |

| 19803 | root | AY130121082434a.local:33112 | fo | Sleep | 1363 | | NULL |

| 19802 | root | AY130121082434a.local:33111 | fo | Sleep | 1390 | | NULL |

| 19804 | root | AY130121082434a.local:33113 | fo | Sleep | 343 | | NULL |

| 19805 | root | 222.95.56.226:8148 | fo | Sleep | 2910 | | NULL |

| 19806 | root | 222.95.56.226:8147 | fo | Sleep | 2911 | | NULL |

| 19807 | root | 222.95.56.226:8149 | fo | Sleep | 2910 | | NULL |

| 19808 | root | 222.95.56.226:8150 | fo | Sleep | 2905 | | NULL |

| 19809 | root | 222.95.56.226:8151 | fo | Sleep | 2901 | | NULL |

| 19810 | root | 222.95.56.226:8153 | fo | Sleep | 2896 | | NULL |

| 19811 | root | 222.95.56.226:8154 | fo | Sleep | 2891 | | NULL |

| 19812 | root | 222.95.56.226:8155 | fo | Sleep | 2886 | | NULL |

| 19813 | root | 222.95.56.226:8156 | fo | Sleep | 2881 | | NULL |

| 19814 | root | 222.95.56.226:8159 | fo | Sleep | 2876 | | NULL |

| 19815 | root | 222.95.56.226:8160 | fo | Sleep | 2870 | | NULL |

| 19816 | root | 222.95.56.226:8161 | fo | Sleep | 2848 | | NULL |

| 19817 | root | 222.95.56.226:8162 | fo | Sleep | 2848 | | NULL |

| 19818 | root | 222.95.56.226:8163 | fo | Sleep | 2849 | | NULL |

| 19819 | root | 222.95.56.226:8164 | fo | Sleep | 2849 | | NULL |

| 19820 | root | 222.95.56.226:8167 | fo | Sleep | 2846 | | NULL |

| 19821 | root | 222.95.56.226:8168 | fo | Sleep | 2468 | | NULL |

| 19822 | root | 222.95.56.226:8169 | fo | Sleep | 2836 | | NULL |

| 19823 | root | 222.95.56.226:8173 | fo | Sleep | 2468 | | NULL |

| 19824 | root | 222.95.56.226:8174 | fo | Sleep | 2469 | | NULL |

| 19827 | root | 222.95.56.226:8417 | fo | Sleep | 1266 | | NULL |

| 19828 | root | 222.95.56.226:8416 | fo | Sleep | 1266 | | NULL |

| 19829 | root | 222.95.56.226:8415 | fo | Sleep | 1263 | | NULL |

| 19830 | root | 222.95.56.226:8418 | fo | Sleep | 1258 | | NULL |

| 19831 | root | 222.95.56.226:8421 | fo | Sleep | 1253 | | NULL |

| 19842 | root | 222.95.56.226:8439 | fo | Sleep | 1141 | | NULL |

| 19844 | root | 222.95.56.226:8440 | fo | Sleep | 1142 | | NULL |

| 19843 | root | 222.95.56.226:8441 | fo | Sleep | 1143 | | NULL |

| 19845 | root | 222.95.56.226:8442 | fo | Sleep | 1143 | | NULL |

| 19846 | root | 222.95.56.226:8443 | fo | Sleep | 1144 | | NULL |

| 19847 | root | 222.95.56.226:8451 | fo | Sleep | 1144 | | NULL |

| 19849 | root | 222.95.56.226:8452 | fo | Sleep | 1144 | | NULL |

| 19851 | root | 222.95.56.226:8453 | fo | Sleep | 1143 | | NULL |

| 19853 | root | AY130121082434a.local:33981 | mo | Sleep | 1157 | | NULL |

| 19852 | root | AY130121082434a.local:33980 | mo | Sleep | 1157 | | NULL |

| 19854 | root | AY130121082434a.local:33982 | mo | Sleep | 1157 | | NULL |

| 19856 | root | 222.95.56.226:8455 | fo | Sleep | 1112 | | NULL |

| 19857 | root | AY130121082434a.local:33983 | fo | Sleep | 343 | | NULL |

| 19858 | root | 222.95.56.226:8462 | fo | Sleep | 1112 | | NULL |

| 19859 | root | 222.95.56.226:8463 | fo | Sleep | 1113 | | NULL |

| 19860 | root | 222.95.56.226:8464 | fo | Sleep | 1113 | | NULL |

| 19861 | root | 222.95.56.226:8466 | fo | Sleep | 1113 | | NULL |

| 19869 | root | 222.95.56.226:8491 | fo | Sleep | 1052 | | NULL |

| 19868 | root | 222.95.56.226:8492 | fo | Sleep | 1047 | | NULL |

| 19870 | root | 222.95.56.226:8490 | fo | Sleep | 1042 | | NULL |

| 19871 | root | 222.95.56.226:8493 | fo | Sleep | 1037 | | NULL |

| 19872 | root | 222.95.56.226:8494 | fo | Sleep | 1032 | | NULL |

| 19873 | root | 222.95.56.226:8495 | fo | Sleep | 1027 | | NULL |

| 19874 | root | 222.95.56.226:8496 | fo | Sleep | 1022 | | NULL |

| 19875 | root | 222.95.56.226:8497 | fo | Sleep | 1017 | | NULL |

| 19877 | root | 222.95.56.226:8499 | fo | Sleep | 1007 | | NULL |

| 19878 | root | 222.95.56.226:8500 | fo | Sleep | 1002 | | NULL |

| 19879 | root | 222.95.56.226:8501 | fo | Sleep | 631 | | NULL |

| 19880 | root | 222.95.56.226:8508 | fo | Sleep | 668 | | NULL |

| 19881 | root | AY130121082434a.local:34006 | fo | Sleep | 343 | | NULL |

| 19898 | root | AY130121082434a.local:34088 | mo | Sleep | 257 | | NULL |

+-------+----------------------+-----------------------------+------+---------+------+-------+-----------------------+

查看mysql状态

[sql]

mysql> show status;

+-----------------------------------+-----------+

| Variable_name | Value |

+-----------------------------------+-----------+

| Aborted_clients | 1574 |

| Aborted_connects | 3890 |

| Binlog_cache_disk_use | 0 |

| Binlog_cache_use | 0 |

| Bytes_received | 181 |

| Bytes_sent | 25363 |

| Com_admin_commands | 0 |

| Com_assign_to_keycache | 0 |

| Com_alter_db | 0 |

| Com_alter_db_upgrade | 0 |

| Com_alter_event | 0 |

| Com_alter_function | 0 |

| Com_alter_procedure | 0 |

| Com_alter_server | 0 |

| Com_alter_table | 0 |

| Com_alter_tablespace | 0 |

| Com_analyze | 0 |

| Com_backup_table | 0 |

| Com_begin | 0 |

| Com_binlog | 0 |

| Com_call_procedure | 0 |

| Com_change_db | 0 |

| Com_change_master | 0 |

| Com_check | 0 |

| Com_checksum | 0 |

| Com_commit | 0 |

| Com_create_db | 0 |

| Com_create_event | 0 |

| Com_create_function | 0 |

| Com_create_index | 0 |

| Com_create_procedure | 0 |

| Com_create_server | 0 |

| Com_create_table | 0 |

| Com_create_trigger | 0 |

| Com_create_udf | 0 |

| Com_create_user | 0 |

| Com_create_view | 0 |

| Com_dealloc_sql | 0 |

| Com_delete | 0 |

| Com_delete_multi | 0 |

| Com_do | 0 |

| Com_drop_db | 0 |

| Com_drop_event | 0 |

| Com_drop_function | 0 |

| Com_drop_index | 0 |

| Com_drop_procedure | 0 |

| Com_drop_server | 0 |

| Com_drop_table | 0 |

| Com_drop_trigger | 0 |

| Com_drop_user | 0 |

| Com_drop_view | 0 |

| Com_empty_query | 0 |

| Com_execute_sql | 0 |

| Com_flush | 0 |

| Com_grant | 0 |

| Com_ha_close | 0 |

| Com_ha_open | 0 |

| Com_ha_read | 0 |

| Com_help | 0 |

| Com_insert | 0 |

| Com_insert_select | 0 |

| Com_install_plugin | 0 |

| Com_kill | 0 |

| Com_load | 0 |

| Com_load_master_data | 0 |

| Com_load_master_table | 0 |

| Com_lock_tables | 0 |

| Com_optimize | 0 |

| Com_preload_keys | 0 |

| Com_prepare_sql | 0 |

| Com_purge | 0 |

| Com_purge_before_date | 0 |

| Com_release_savepoint | 0 |

| Com_rename_table | 0 |

| Com_rename_user | 0 |

| Com_repair | 0 |

| Com_replace | 0 |

| Com_replace_select | 0 |

| Com_reset | 0 |

| Com_restore_table | 0 |

| Com_revoke | 0 |

| Com_revoke_all | 0 |

| Com_rollback | 0 |

| Com_rollback_to_savepoint | 0 |

| Com_savepoint | 0 |

| Com_select | 1 |

| Com_set_option | 0 |

| Com_show_authors | 0 |

| Com_show_binlog_events | 0 |

| Com_show_binlogs | 0 |

| Com_show_charsets | 0 |

| Com_show_collations | 0 |

| Com_show_column_types | 0 |

| Com_show_contributors | 0 |

| Com_show_create_db | 0 |

| Com_show_create_event | 0 |

| Com_show_create_func | 0 |

| Com_show_create_proc | 0 |

| Com_show_create_table | 0 |

| Com_show_create_trigger | 0 |

| Com_show_databases | 0 |

| Com_show_engine_logs | 0 |

| Com_show_engine_mutex | 0 |

| Com_show_engine_status | 0 |

| Com_show_events | 0 |

| Com_show_errors | 0 |

| Com_show_fields | 0 |

| Com_show_function_status | 0 |

| Com_show_grants | 0 |

| Com_show_keys | 0 |

| Com_show_master_status | 0 |

| Com_show_new_master | 0 |

| Com_show_open_tables | 0 |

| Com_show_plugins | 0 |

| Com_show_privileges | 0 |

| Com_show_procedure_status | 0 |

| Com_show_processlist | 2 |

| Com_show_profile | 0 |

| Com_show_profiles | 0 |

| Com_show_slave_hosts | 0 |

| Com_show_slave_status | 0 |

| Com_show_status | 1 |

| Com_show_storage_engines | 0 |

| Com_show_table_status | 0 |

| Com_show_tables | 0 |

| Com_show_triggers | 0 |

| Com_show_variables | 1 |

| Com_show_warnings | 0 |

| Com_slave_start | 0 |

| Com_slave_stop | 0 |

| Com_stmt_close | 0 |

| Com_stmt_execute | 0 |

| Com_stmt_fetch | 0 |

| Com_stmt_prepare | 0 |

| Com_stmt_reprepare | 0 |

| Com_stmt_reset | 0 |

| Com_stmt_send_long_data | 0 |

| Com_truncate | 0 |

| Com_uninstall_plugin | 0 |

| Com_unlock_tables | 0 |

| Com_update | 0 |

| Com_update_multi | 0 |

| Com_xa_commit | 0 |

| Com_xa_end | 0 |

| Com_xa_prepare | 0 |

| Com_xa_recover | 0 |

| Com_xa_rollback | 0 |

| Com_xa_start | 0 |

| Compression | OFF |

| Connections | 19904 |

| Created_tmp_disk_tables | 0 |

| Created_tmp_files | 5 |

| Created_tmp_tables | 1 |

| Delayed_errors | 0 |

| Delayed_insert_threads | 0 |

| Delayed_writes | 0 |

| Flush_commands | 1 |

| Handler_commit | 0 |

| Handler_delete | 0 |

| Handler_discover | 0 |

| Handler_prepare | 0 |

| Handler_read_first | 0 |

| Handler_read_key | 0 |

| Handler_read_next | 0 |

| Handler_read_prev | 0 |

| Handler_read_rnd | 0 |

| Handler_read_rnd_next | 277 |

| Handler_rollback | 0 |

| Handler_savepoint | 0 |

| Handler_savepoint_rollback | 0 |

| Handler_update | 0 |

| Handler_write | 276 |

| Innodb_buffer_pool_pages_data | 508 |

| Innodb_buffer_pool_pages_dirty | 0 |

| Innodb_buffer_pool_pages_flushed | 8159 |

| Innodb_buffer_pool_pages_free | 1 |

| Innodb_buffer_pool_pages_misc | 3 |

| Innodb_buffer_pool_pages_total | 512 |

| Innodb_buffer_pool_read_ahead_rnd | 611 |

| Innodb_buffer_pool_read_ahead_seq | 181 |

| Innodb_buffer_pool_read_requests | 23149188 |

| Innodb_buffer_pool_reads | 9484 |

| Innodb_buffer_pool_wait_free | 0 |

| Innodb_buffer_pool_write_requests | 190314 |

| Innodb_data_fsyncs | 16464 |

| Innodb_data_pending_fsyncs | 0 |

| Innodb_data_pending_reads | 0 |

| Innodb_data_pending_writes | 0 |

| Innodb_data_read | 268521472 |

| Innodb_data_reads | 11361 |

| Innodb_data_writes | 21253 |

| Innodb_data_written | 283684352 |

| Innodb_dblwr_pages_written | 8159 |

| Innodb_dblwr_writes | 1459 |

| Innodb_log_waits | 0 |

| Innodb_log_write_requests | 20515 |

| Innodb_log_writes | 12238 |

| In

Mysql ERROR 1040 (HY000): Too many connections解决_MySQL