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。
mysql> show full processlist; +-------+----------------------+-----------------------------+------+---------+------+-------+-----------------------+ | Id | User | Host | db | Command | Time | State | Info | +-------+----------------------+-----------------------------+------+---------+------+-------+-----------------------+ | 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 | | 19782 | root | AY130121082434a.local:32959 | moco | Sleep | 3840 | | NULL | | 19783 | root | AY130121082434a.local:32958 | moco | Sleep | 3840 | | NULL | | 19784 | root | AY130121082434a.local:32961 | moco | Sleep | 3840 | | NULL | | 19785 | root | AY130121082434a.local:32962 | moco | Sleep | 3840 | | NULL | | 19786 | root | AY130121082434a.local:32963 | moco | Sleep | 3840 | | NULL | | 19787 | root | AY130121082434a.local:32964 | moco | Sleep | 3840 | | NULL | | 19788 | root | AY130121082434a.local:32965 | moco | Sleep | 3840 | | NULL | | 19789 | root | AY130121082434a.local:32966 | moco | Sleep | 3840 | | NULL | | 19790 | root | AY130121082434a.local:32967 | moco | Sleep | 3840 | | NULL | | 19791 | root | AY130121082434a.local:32968 | moco | Sleep | 3840 | | NULL | | 19792 | root | AY130121082434a.local:32969 | moco | Sleep | 3839 | | NULL | | 19793 | root | AY130121082434a.local:32970 | moco | Sleep | 3839 | | NULL | | 19794 | root | AY130121082434a.local:32971 | moco | Sleep | 3839 | | NULL | | 19795 | root | AY130121082434a.local:32972 | moco | Sleep | 3839 | | NULL | | 19796 | root | AY130121082434a.local:32973 | moco | Sleep | 3839 | | NULL | | 19797 | root | AY130121082434a.local:32974 | moco | Sleep | 3839 | | NULL | | 19798 | root | AY130121082434a.local:32975 | moco | Sleep | 3839 | | NULL | | 19799 | root | AY130121082434a.local:32976 | moco | Sleep | 3839 | | NULL | | 19800 | root | AY130121082434a.local:32977 | moco | Sleep | 3839 | | 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 | | 19825 | root | AY130121082434a.local:33342 | moco | Sleep | 2570 | | NULL | | 19826 | root | AY130121082434a.local:33527 | moco | Sleep | 2490 | | 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 | | 19839 | root | AY130121082434a.local:33955 | moco | Sleep | 1220 | | NULL | | 19841 | root | AY130121082434a.local:33957 | moco | Sleep | 1220 | | NULL | | 19840 | root | AY130121082434a.local:33956 | moco | Sleep | 1220 | | 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 | | 19882 | root | AY130121082434a.local:34071 | moco | Sleep | 320 | | NULL | | 19883 | root | AY130121082434a.local:34072 | moco | Sleep | 320 | | NULL | | 19884 | root | AY130121082434a.local:34073 | moco | Sleep | 320 | | NULL | | 19885 | root | AY130121082434a.local:34074 | moco | Sleep | 320 | | NULL | | 19886 | root | AY130121082434a.local:34075 | moco | Sleep | 320 | | NULL | | 19887 | root | AY130121082434a.local:34076 | moco | Sleep | 320 | | NULL | | 19889 | root | AY130121082434a.local:34078 | moco | Sleep | 320 | | NULL | | 19890 | root | AY130121082434a.local:34079 | moco | Sleep | 320 | | NULL | | 19888 | root | AY130121082434a.local:34077 | moco | Sleep | 320 | | NULL | | 19891 | root | AY130121082434a.local:34080 | moco | Sleep | 320 | | NULL | | 19892 | root | AY130121082434a.local:34081 | moco | Sleep | 320 | | NULL | | 19893 | root | AY130121082434a.local:34083 | moco | Sleep | 320 | | NULL | | 19894 | root | AY130121082434a.local:34084 | moco | Sleep | 320 | | NULL | | 19895 | root | AY130121082434a.local:34085 | moco | Sleep | 320 | | NULL | | 19896 | root | AY130121082434a.local:34086 | moco | Sleep | 320 | | NULL | | 19897 | root | AY130121082434a.local:34087 | moco | Sleep | 320 | | NULL | | 19898 | root | AY130121082434a.local:34088 | mo | Sleep | 257 | | NULL | | 19899 | root | localhost | NULL | Query | 0 | NULL | show full processlist | | 19901 | unauthenticated user | 211.149.151.45:4090 | NULL | Connect | NULL | login | NULL | +-------+----------------------+-----------------------------+------+---------+------+-------+-----------------------+
查看mysql状态
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 | | Innodb_os_log_fsyncs | 13549 | | Innodb_os_log_pending_fsyncs | 0 | | Innodb_os_log_pending_writes | 0 | | Innodb_os_log_written | 15657472 | | Innodb_page_size | 16384 | | Innodb_pages_created | 457 | | Innodb_pages_read | 16256 | | Innodb_pages_written | 8159 | | Innodb_row_lock_current_waits | 0 | | Innodb_row_lock_time | 882 | | Innodb_row_lock_time_avg | 29 | | Innodb_row_lock_time_max | 185 | | Innodb_row_lock_waits | 30 | | Innodb_rows_deleted | 115 | | Innodb_rows_inserted | 13542 | | Innodb_rows_read | 9862769 | | Innodb_rows_updated | 24051 | | Key_blocks_not_flushed | 0 | | Key_blocks_unused | 13396 | | Key_blocks_used | 5 | | Key_read_requests | 9 | | Key_reads | 5 | | Key_write_requests | 2 | | Key_writes | 2 | | Last_query_cost | 10.499000 | | Max_used_connections | 152 | | Not_flushed_delayed_rows | 0 | | Open_files | 2 | | Open_streams | 0 | | Open_table_definitions | 256 | | Open_tables | 64 | | Opened_files | 20815 | | Opened_table_definitions | 0 | | Opened_tables | 0 | | Prepared_stmt_count | 0 | | Qcache_free_blocks | 594 | | Qcache_free_memory | 8994056 | | Qcache_hits | 33660 | | Qcache_inserts | 19694 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 54423 | | Qcache_queries_in_cache | 2806 | | Qcache_total_blocks | 6369 | | Queries | 498358 | | Questions | 5 | | Rpl_status | NULL | | Select_full_join | 0 | | Select_full_range_join | 0 | | Select_range | 0 | | Select_range_check | 0 | | Select_scan | 1 | | Slave_open_temp_tables | 0 | | Slave_retried_transactions | 0 | | Slave_running | OFF | | Slow_launch_threads | 0 | | Slow_queries | 0 | | Sort_merge_passes | 0 | | Sort_range | 0 | | Sort_rows | 0 | | Sort_scan | 0 | | Ssl_accept_renegotiates | 0 | | Ssl_accepts | 0 | | Ssl_callback_cache_hits | 0 | | Ssl_cipher | | | Ssl_cipher_list | | | Ssl_client_connects | 0 | | Ssl_connect_renegotiates | 0 | | Ssl_ctx_verify_depth | 0 | | Ssl_ctx_verify_mode | 0 | | Ssl_default_timeout | 0 | | Ssl_finished_accepts | 0 | | Ssl_finished_connects | 0 | | Ssl_session_cache_hits | 0 | | Ssl_session_cache_misses | 0 | | Ssl_session_cache_mode | NONE | | Ssl_session_cache_overflows | 0 | | Ssl_session_cache_size | 0 | | Ssl_session_cache_timeouts | 0 | | Ssl_sessions_reused | 0 | | Ssl_used_session_cache_entries | 0 | | Ssl_verify_depth | 0 | | Ssl_verify_mode | 0 | | Ssl_version | | | Table_locks_immediate | 82747 | | Table_locks_waited | 0 | | Tc_log_max_pages_used | 0 | | Tc_log_page_size | 0 | | Tc_log_page_waits | 0 | | Threads_cached | 0 | | Threads_connected | 152 | | Threads_created | 6866 | | Threads_running | 1 | | Uptime | 1368785 | | Uptime_since_flush_status | 1368785 | +-----------------------------------+-----------+
说明：
Aborted_clients 由于客户没有正确关闭连接已经死掉，已经放弃的连接数量。
Aborted_connects 尝试已经失败的MySQL服务器的连接的次数。
Connections 试图连接MySQL服务器的次数。
Created_tmp_tables 当执行语句时，已经被创造了的隐含临时表的数量。
Delayed_insert_threads 正在使用的延迟插入处理器线程的数量。
Delayed_writes 用INSERT DELAYED写入的行数。
Delayed_errors 用INSERT DELAYED写入的发生某些错误(可能重复键值)的行数。
Flush_commands 执行FLUSH命令的次数。
Handler_delete 请求从一张表中删除行的次数。
Handler_read_first 请求读入表中第一行的次数。
Handler_read_key 请求数字基于键读行。
Handler_read_next 请求读入基于一个键的一行的次数。
Handler_read_rnd 请求读入基于一个固定位置的一行的次数。
Handler_update 请求更新表中一行的次数。
Handler_write 请求向表中插入一行的次数。
Key_blocks_used 用于关键字缓存的块的数量。
Key_read_requests 请求从缓存读入一个键值的次数。
Key_reads 从磁盘物理读入一个键值的次数。
Key_write_requests 请求将一个关键字块写入缓存次数。
Key_writes 将一个键值块物理写入磁盘的次数。
Max_used_connections 同时使用的连接的最大数目。
Not_flushed_key_blocks 在键缓存中已经改变但是还没被清空到磁盘上的键块。
Not_flushed_delayed_rows 在INSERT DELAY队列中等待写入的行的数量。
Open_tables 打开表的数量。
Open_files 打开文件的数量。
Open_streams 打开流的数量(主要用于日志记载）
Opened_tables 已经打开的表的数量。
Questions 发往服务器的查询的数量。
Slow_queries 要花超过long_query_time时间的查询数量。
Threads_connected 当前打开的连接的数量。
Threads_running 不在睡眠的线程数量。
Uptime 服务器工作了多少秒。
