查看mysql数据库最大连接数和已经连接的数量

MySQL报错Can not connect to MySQL server. Too many connections，报错，很明确，与MySQL的连接数满了。
首先我们先查看下数据线程池的一些数据
查看最大连接数
mysqladmin -uroot -p processlist
一般这个时候会提醒你连接数已经够多了，你已经进入不了数据库了，所有还是使用你当前的客户端工具查看吧

 SHOW PROCESSLIST;SHOW STATUS;SHOW VARIABLES LIKE "max_connections";

1.SHOW PROCESSLIST查看当前数据库连接
如果是root帐号，你能看到所有用户的当前连接。如果是其它普通帐号，只能看到自己占用的连接。
show processlist;只列出前100条，如果想全列出请使用show full processlist;

2.SHOW VARIABLES LIKE “max_connections” 查看最大连接数Threads_connected;

3.show status可查看当前已连接的数量

Variable_name    Value
Aborted_clients 1750
Aborted_connects    271
Binlog_cache_disk_use   0
Binlog_cache_use    0
Binlog_stmt_cache_disk_use  0
Binlog_stmt_cache_use   0
Bytes_received  39810
Bytes_sent  321179
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 2
Com_alter_tablespace    0
Com_alter_user  0
Com_analyze 0
Com_begin   0
Com_binlog  0
Com_call_procedure  0
Com_change_db   11
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    7
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  2
Com_drop_trigger    0
Com_drop_user   0
Com_drop_view   0
Com_empty_query 0
Com_execute_sql 0
Com_flush   0
Com_get_diagnostics 0
Com_grant   0
Com_ha_close    0
Com_ha_open 0
Com_ha_read 0
Com_help    0
Com_insert  41
Com_insert_select   0
Com_install_plugin  0
Com_kill    0
Com_load    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_resignal    0
Com_revoke  0
Com_revoke_all  0
Com_rollback    0
Com_rollback_to_savepoint   0
Com_savepoint   0
Com_select  69
Com_set_option  55
Com_signal  0
Com_show_binlog_events  0
Com_show_binlogs    0
Com_show_charsets   4
Com_show_collations 4
Com_show_create_db  5
Com_show_create_event   0
Com_show_create_func    0
Com_show_create_proc    0
Com_show_create_table   29
Com_show_create_trigger 0
Com_show_databases  5
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 31
Com_show_function_code  0
Com_show_function_status    5
Com_show_grants 0
Com_show_keys   31
Com_show_master_status  0
Com_show_open_tables    0
Com_show_plugins    0
Com_show_privileges 0
Com_show_procedure_code 0
Com_show_procedure_status   5
Com_show_processlist    7
Com_show_profile    0
Com_show_profiles   12
Com_show_relaylog_events    0
Com_show_slave_hosts    0
Com_show_slave_status   0
Com_show_status 36
Com_show_storage_engines    0
Com_show_table_status   12
Com_show_tables 10
Com_show_triggers   5
Com_show_variables  33
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  87
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 ON
Connection_errors_accept    0
Connection_errors_internal  0
Connection_errors_max_connections   1370
Connection_errors_peer_address  0
Connection_errors_select    0
Connection_errors_tcpwrap   0
Connections 12310
Created_tmp_disk_tables 103
Created_tmp_files   13110
Created_tmp_tables  309
Delayed_errors  0
Delayed_insert_threads  0
Delayed_writes  0
Flush_commands  1
Handler_commit  142
Handler_delete  0
Handler_discover    0
Handler_external_lock   316
Handler_mrr_init    0
Handler_prepare 0
Handler_read_first  28
Handler_read_key    726
Handler_read_last   0
Handler_read_next   0
Handler_read_prev   0
Handler_read_rnd    192
Handler_read_rnd_next   5482
Handler_rollback    0
Handler_savepoint   0
Handler_savepoint_rollback  0
Handler_update  516
Handler_write   5064
Innodb_buffer_pool_dump_status  not started
Innodb_buffer_pool_load_status  not started
Innodb_buffer_pool_pages_data   3845
Innodb_buffer_pool_bytes_data   62996480
Innodb_buffer_pool_pages_dirty  0
Innodb_buffer_pool_bytes_dirty  0
Innodb_buffer_pool_pages_flushed    301814
Innodb_buffer_pool_pages_free   4218
Innodb_buffer_pool_pages_misc   128
Innodb_buffer_pool_pages_total  8191
Innodb_buffer_pool_read_ahead_rnd   0
Innodb_buffer_pool_read_ahead   127
Innodb_buffer_pool_read_ahead_evicted   0
Innodb_buffer_pool_read_requests    126411955
Innodb_buffer_pool_reads    3187
Innodb_buffer_pool_wait_free    0
Innodb_buffer_pool_write_requests   612176
Innodb_data_fsyncs  397006
Innodb_data_pending_fsyncs  0
Innodb_data_pending_reads   0
Innodb_data_pending_writes  0
Innodb_data_read    54480896
Innodb_data_reads   3598
Innodb_data_writes  552289
Innodb_data_written 10014147584
Innodb_dblwr_pages_written  301814
Innodb_dblwr_writes 70817
Innodb_have_atomic_builtins ON
Innodb_log_waits    0
Innodb_log_write_requests   68955
Innodb_log_writes   108688
Innodb_os_log_fsyncs    179512
Innodb_os_log_pending_fsyncs    0
Innodb_os_log_pending_writes    0
Innodb_os_log_written   88069120
Innodb_page_size    16384
Innodb_pages_created    525
Innodb_pages_read   3320
Innodb_pages_written    301814
Innodb_row_lock_current_waits   0
Innodb_row_lock_time    0
Innodb_row_lock_time_avg    0
Innodb_row_lock_time_max    0
Innodb_row_lock_waits   0
Innodb_rows_deleted 91
Innodb_rows_inserted    9110
Innodb_rows_read    298911691
Innodb_rows_updated 108767
Innodb_num_open_files   276
Innodb_truncated_status_writes  0
Innodb_available_undo_logs  128
Key_blocks_not_flushed  0
Key_blocks_unused   6698
Key_blocks_used 0
Key_read_requests   0
Key_reads   0
Key_write_requests  0
Key_writes  0
Last_query_cost 10.499000
Last_query_partial_plans    1
Max_used_connections    215
Not_flushed_delayed_rows    0
Open_files  46
Open_streams    0
Open_table_definitions  358
Open_tables 395
Opened_files    44624
Opened_table_definitions    8
Opened_tables   2
Performance_schema_accounts_lost    0
Performance_schema_cond_classes_lost    0
Performance_schema_cond_instances_lost  0
Performance_schema_digest_lost  0
Performance_schema_file_classes_lost    0
Performance_schema_file_handles_lost    0
Performance_schema_file_instances_lost  0
Performance_schema_hosts_lost   0
Performance_schema_locker_lost  0
Performance_schema_mutex_classes_lost   0
Performance_schema_mutex_instances_lost 0
Performance_schema_rwlock_classes_lost  0
Performance_schema_rwlock_instances_lost    0
Performance_schema_session_connect_attrs_lost   0
Performance_schema_socket_classes_lost  0
Performance_schema_socket_instances_lost    0
Performance_schema_stage_classes_lost   0
Performance_schema_statement_classes_lost   0
Performance_schema_table_handles_lost   0
Performance_schema_table_instances_lost 0
Performance_schema_thread_classes_lost  0
Performance_schema_thread_instances_lost    0
Performance_schema_users_lost   0
Prepared_stmt_count 0
Qcache_free_blocks  1
Qcache_free_memory  1031352
Qcache_hits 0
Qcache_inserts  0
Qcache_lowmem_prunes    0
Qcache_not_cached   1389061
Qcache_queries_in_cache 0
Qcache_total_blocks 1
Queries 2094615
Questions   511
Rsa_public_key
Select_full_join    0
Select_full_range_join  0
Select_range    0
Select_range_check  0
Select_scan 213
Slave_heartbeat_period
Slave_last_heartbeat
Slave_open_temp_tables  0
Slave_received_heartbeats
Slave_retried_transactions
Slave_running   OFF
Slow_launch_threads 0
Slow_queries    0
Sort_merge_passes   0
Sort_range  0
Sort_rows   351
Sort_scan   20
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_server_not_after
Ssl_server_not_before
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   863932
Table_locks_waited  0
Table_open_cache_hits   1411
Table_open_cache_misses 1
Table_open_cache_overflows  0
Tc_log_max_pages_used   0
Tc_log_page_size    0
Tc_log_page_waits   0
Threads_cached  9
Threads_connected   162
Threads_created 1193
Threads_running 1
Uptime  887001
Uptime_since_flush_status   887001

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。

当前已经连接的数量如果达到最大连接数，再启动项目肯定就连接不上了，下一篇我会编辑下处理的办法。

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