mysql show processlist命令 详解
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> show full processlist;
+---------+-------------+--------------------+----------------+-------------+-------+-----------------------------------------------------------------------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+---------+-------------+--------------------+----------------+-------------+-------+-----------------------------------------------------------------------+-----------------------+
| 1056536 | replication | 192.168.6.91:38417 | NULL | Binlog Dump | 33759 | Master has sent all binlog to slave; waiting for binlog to be updated | NULL |
| 1107067 | miaohr | 192.168.6.81:32024 | NULL | Query | 0 | NULL | show full processlist |
| 1107182 | miaohr | 192.168.6.91:44217 | hr_db_business | Sleep | 1 | | NULL |
+---------+-------------+--------------------+----------------+-------------+-------+-----------------------------------------------------------------------+-----------------------+
这个命令中最关键的就是state列，mysql列出的状态主要有以下几种：
Checking table
正在检查数据表（这是自动的）。
Closing tables
正在将表中修改的数据刷新到磁盘中，同时正在关闭已经用完的表。这是一个很快的操作，如果不是这样的话，就应该确认磁盘空间是否已经满了或者磁盘是否正处于重负中。
Connect Out
复制从服务器正在连接主服务器。
Copying to tmp table on disk
由于临时结果集大于tmp_table_size，正在将临时表从内存存储转为磁盘存储以此节省内存。
Creating tmp table
正在创建临时表以存放部分查询结果。
deleting from main table
服务器正在执行多表删除中的第一部分，刚删除第一个表。
deleting from reference tables
服务器正在执行多表删除中的第二部分，正在删除其他表的记录。
Flushing tables
正在执行FLUSH TABLES，等待其他线程关闭数据表。
Killed
发送了一个kill请求给某线程，那么这个线程将会检查kill标志位，同时会放弃下一个kill请求。MySQL会在每次的主循环中检查kill标志位，不过有些情况下该线程可能会过一小段才能死掉。如果该线程程被其他线程锁住了，那么kill请求会在锁释放时马上生效。
Locked
被其他查询锁住了。
Sending data
正在处理SELECT查询的记录，同时正在把结果发送给客户端。
Sorting for group
正在为GROUP BY做排序。
Sorting for order
正在为ORDER BY做排序。
Opening tables
这个过程应该会很快，除非受到其他因素的干扰。例如，在执ALTER TABLE或LOCK TABLE语句行完以前，数据表无法被其他线程打开。正尝试打开一个表。
Removing duplicates
正在执行一个SELECT DISTINCT方式的查询，但是MySQL无法在前一个阶段优化掉那些重复的记录。因此，MySQL需要再次去掉重复的记录，然后再把结果发送给客户端。
Reopen table
获得了对一个表的锁，但是必须在表结构修改之后才能获得这个锁。已经释放锁，关闭数据表，正尝试重新打开数据表。
Repair by sorting
修复指令正在排序以创建索引。
Repair with keycache
修复指令正在利用索引缓存一个一个地创建新索引。它会比Repair by sorting慢些。
Searching rows for update
正在讲符合条件的记录找出来以备更新。它必须在UPDATE要修改相关的记录之前就完成了。
Sleeping
正在等待客户端发送新请求.
System lock
正在等待取得一个外部的系统锁。如果当前没有运行多个mysqld服务器同时请求同一个表，那么可以通过增加--skip-external-locking参数来禁止外部系统锁。
Upgrading lock
INSERT DELAYED正在尝试取得一个锁表以插入新记录。
Updating
正在搜索匹配的记录，并且修改它们。
User Lock
正在等待GET_LOCK()。
Waiting for tables
该线程得到通知，数据表结构已经被修改了，需要重新打开数据表以取得新的结构。然后，为了能的重新打开数据表，必须等到所有其他线程关闭这个表。以下几种情况下会产生这个通知：FLUSH TABLES tbl_name, ALTER TABLE, RENAME TABLE, REPAIR TABLE, ANALYZE TABLE,或OPTIMIZE TABLE。
waiting for handler insert
INSERT DELAYED已经处理完了所有待处理的插入操作，正在等待新的请求。
大部分状态对应很快的操作，只要有一个线程保持同一个状态好几秒钟，那么可能是有问题发生了，需要检查一下。
还有其他的状态没在上面中列出来，不过它们大部分只是在查看服务器是否有存在错误是才用得着。
mysql 查看当前连接数
命令： show processlist;
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;
mysql> show processlist;
命令： show status;
mysql> show status; +------------------------------------------+----------------------+ | Variable_name | Value | +------------------------------------------+----------------------+ | Aborted_clients | 777 | | Aborted_connects | 16 | | Binlog_cache_disk_use | 532 | | Binlog_cache_use | 8333221 | | Binlog_stmt_cache_disk_use | 0 | | Binlog_stmt_cache_use | 18732 | | Bytes_received | 303 | | Bytes_sent | 12460 | | 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_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_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 | 1 | | Com_set_option | 0 | | Com_signal | 0 | | Com_show_authors | 0 | | Com_show_binlog_events | 0 | | Com_show_binlogs | 0 | | Com_show_charsets | 0 | | Com_show_collations | 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_open_tables | 0 | | Com_show_plugins | 0 | | Com_show_privileges | 0 | | Com_show_procedure_status | 0 | | Com_show_processlist | 6 | | Com_show_profile | 0 | | Com_show_profiles | 0 | | Com_show_relaylog_events | 0 | | Com_show_slave_hosts | 0 | | Com_show_slave_status | 0 | | Com_show_status | 2 | | Com_show_storage_engines | 0 | | Com_show_table_status | 0 | | Com_show_tables | 0 | | Com_show_triggers | 0 | | Com_show_variables | 0 | | 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 | 1107216 | | Created_tmp_disk_tables | 0 | | Created_tmp_files | 564 | | Created_tmp_tables | 0 | | 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_last | 0 | | Handler_read_next | 0 | | Handler_read_prev | 0 | | Handler_read_rnd | 0 | | Handler_read_rnd_next | 0 | | Handler_rollback | 0 | | Handler_savepoint | 0 | | Handler_savepoint_rollback | 0 | | Handler_update | 0 | | Handler_write | 0 | | Innodb_buffer_pool_pages_data | 376178 | | Innodb_buffer_pool_bytes_data | 4261109760 | | Innodb_buffer_pool_pages_dirty | 0 | | Innodb_buffer_pool_bytes_dirty | 0 | | Innodb_buffer_pool_pages_flushed | 4419408 | | Innodb_buffer_pool_pages_free | 0 | | Innodb_buffer_pool_pages_misc | 18446744073709437581 | | Innodb_buffer_pool_pages_total | 262143 | | Innodb_buffer_pool_read_ahead_rnd | 0 | | Innodb_buffer_pool_read_ahead | 506357 | | Innodb_buffer_pool_read_ahead_evicted | 49891 | | Innodb_buffer_pool_read_requests | 3550554620 | | Innodb_buffer_pool_reads | 8777938 | | Innodb_buffer_pool_wait_free | 0 | | Innodb_buffer_pool_write_requests | 159577779 | | Innodb_data_fsyncs | 13359191 | | Innodb_data_pending_fsyncs | 0 | | Innodb_data_pending_reads | 0 | | Innodb_data_pending_writes | 0 | | Innodb_data_read | 133311885312 | | Innodb_data_reads | 9323868 | | Innodb_data_writes | 17580993 | | Innodb_data_written | 163731449856 | | Innodb_dblwr_pages_written | 4419408 | | Innodb_dblwr_writes | 119202 | | Innodb_have_atomic_builtins | ON | | Innodb_log_waits | 0 | | Innodb_log_write_requests | 39730223 | | Innodb_log_writes | 12957426 | | Innodb_os_log_fsyncs | 13004841 | | Innodb_os_log_pending_fsyncs | 0 | | Innodb_os_log_pending_writes | 0 | | Innodb_os_log_written | 25546702336 | | Innodb_page_size | 16384 | | Innodb_pages_created | 539547 | | Innodb_pages_read | 9323581 | | Innodb_pages_written | 4419408 | | Innodb_row_lock_current_waits | 0 | | Innodb_row_lock_time | 26866245 | | Innodb_row_lock_time_avg | 1367 | | Innodb_row_lock_time_max | 55497 | | Innodb_row_lock_waits | 19649 | | Innodb_rows_deleted | 15511 | | Innodb_rows_inserted | 1868056 | | Innodb_rows_read | 1657696248 | | Innodb_rows_updated | 7778106 | | Innodb_truncated_status_writes | 0 | | Key_blocks_not_flushed | 0 | | Key_blocks_unused | 26773 | | Key_blocks_used | 19 | | Key_read_requests | 67555 | | Key_reads | 19 | | Key_write_requests | 69364 | | Key_writes | 11544 | | Last_query_cost | 0.000000 | | Max_used_connections | 436 | | Not_flushed_delayed_rows | 0 | | Open_files | 99 | | Open_streams | 0 | | Open_table_definitions | 327 | | Open_tables | 1301 | | Opened_files | 22851 | | Opened_table_definitions | 0 | | Opened_tables | 0 | | Performance_schema_cond_classes_lost | 0 | | Performance_schema_cond_instances_lost | 0 | | Performance_schema_file_classes_lost | 0 | | Performance_schema_file_handles_lost | 0 | | Performance_schema_file_instances_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_table_handles_lost | 0 | | Performance_schema_table_instances_lost | 0 | | Performance_schema_thread_classes_lost | 0 | | Performance_schema_thread_instances_lost | 0 | | Prepared_stmt_count | 0 | | Qcache_free_blocks | 3426 | | Qcache_free_memory | 38784160 | | Qcache_hits | 9223399 | | Qcache_inserts | 3505151 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 400457 | | Qcache_queries_in_cache | 19336 | | Qcache_total_blocks | 42289 | | Queries | 27883378 | | Questions | 9 | | Rpl_status | AUTH_MASTER | | Select_full_join | 0 | | Select_full_range_join | 0 | | Select_range | 0 | | Select_range_check | 0 | | Select_scan | 0 | | Slave_heartbeat_period | 0.000 | | Slave_open_temp_tables | 0 | | Slave_received_heartbeats | 0 | | Slave_retried_transactions | 0 | | Slave_running | OFF | | Slow_launch_threads | 30 | | 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 | 13127661 | | Table_locks_waited | 648 | | Tc_log_max_pages_used | 0 | | Tc_log_page_size | 0 | | Tc_log_page_waits | 6 | | Threads_cached | 7 | | Threads_connected | 2 | | Threads_created | 54593 | | Threads_running | 2 | | Uptime | 651324 | | Uptime_since_flush_status | 651324 | +------------------------------------------+----------------------+ 312 rows in set (0.01 sec)
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。
查看配置参数：
SHOW VARIABLES LIKE ‘%timeout%‘
Variable_name Value ------------------------------------------------- ------------------------------------------------------------------------------------------------------------------------ auto_increment_increment 1 auto_increment_offset 1 autocommit ON automatic_sp_privileges ON back_log 384 basedir /usr big_tables OFF binlog_cache_size 1048576 binlog_direct_non_transactional_updates OFF binlog_format MIXED binlog_stmt_cache_size 32768 bulk_insert_buffer_size 67108864 character_set_client utf8 character_set_connection utf8 character_set_database utf8 character_set_filesystem binary character_set_results utf8 character_set_server utf8 character_set_system utf8 character_sets_dir /usr/share/mysql/charsets/ collation_connection utf8_general_ci collation_database utf8_general_ci collation_server utf8_general_ci completion_type NO_CHAIN concurrent_insert AUTO connect_timeout 10 datadir /var/lib/mysql/ date_format %Y-%m-%d datetime_format %Y-%m-%d %H:%i:%s default_storage_engine InnoDB default_week_format 0 delay_key_write ON delayed_insert_limit 100 delayed_insert_timeout 300 delayed_queue_size 1000 div_precision_increment 4 engine_condition_pushdown ON error_count 0 event_scheduler OFF expire_logs_days 30 external_user flush OFF flush_time 0 foreign_key_checks ON ft_boolean_syntax + -><()~*:""&| ft_max_word_len 84 ft_min_word_len 4 ft_query_expansion_limit 20 ft_stopword_file (built-in) general_log OFF general_log_file /var/lib/mysql/VM84.log group_concat_max_len 1024 have_compress YES have_crypt YES have_csv YES have_dynamic_loading YES have_geometry YES have_innodb YES have_ndbcluster NO have_openssl DISABLED have_partitioning YES have_profiling YES have_query_cache YES have_rtree_keys YES have_ssl DISABLED have_symlink YES hostname VM84 identity 0 ignore_builtin_innodb OFF init_connect init_file init_slave innodb_adaptive_flushing ON innodb_adaptive_hash_index ON innodb_additional_mem_pool_size 16777216 innodb_autoextend_increment 8 innodb_autoinc_lock_mode 1 innodb_buffer_pool_instances 1 innodb_buffer_pool_size 4294967296 innodb_change_buffering all innodb_checksums ON innodb_commit_concurrency 0 innodb_concurrency_tickets 500 innodb_data_file_path ibdata1:10M:autoextend innodb_data_home_dir innodb_doublewrite ON innodb_fast_shutdown 1 innodb_file_format Antelope innodb_file_format_check ON innodb_file_format_max Antelope innodb_file_per_table ON innodb_flush_log_at_trx_commit 2 innodb_flush_method innodb_force_load_corrupted OFF innodb_force_recovery 0 innodb_io_capacity 200 innodb_large_prefix OFF innodb_lock_wait_timeout 50 innodb_locks_unsafe_for_binlog OFF innodb_log_buffer_size 16777216 innodb_log_file_size 536870912 innodb_log_files_in_group 2 innodb_log_group_home_dir ./ innodb_max_dirty_pages_pct 75 innodb_max_purge_lag 0 innodb_mirrored_log_groups 1 innodb_old_blocks_pct 37 innodb_old_blocks_time 0 innodb_open_files 300 innodb_print_all_deadlocks OFF innodb_purge_batch_size 20 innodb_purge_threads 0 innodb_random_read_ahead OFF innodb_read_ahead_threshold 56 innodb_read_io_threads 4 innodb_replication_delay 0 innodb_rollback_on_timeout OFF innodb_rollback_segments 128 innodb_spin_wait_delay 6 innodb_stats_method nulls_equal innodb_stats_on_metadata ON innodb_stats_sample_pages 8 innodb_strict_mode OFF innodb_support_xa ON innodb_sync_spin_loops 30 innodb_table_locks ON innodb_thread_concurrency 0 innodb_thread_sleep_delay 10000 innodb_use_native_aio ON innodb_use_sys_malloc ON innodb_version 5.5.36 innodb_write_io_threads 4 insert_id 0 interactive_timeout 300 join_buffer_size 8388608 keep_files_on_create OFF key_buffer_size 33554432 key_cache_age_threshold 300 key_cache_block_size 1024 key_cache_division_limit 100 large_files_support ON large_page_size 0 large_pages OFF last_insert_id 0 lc_messages en_US lc_messages_dir /usr/share/mysql/ lc_time_names en_US license GPL local_infile ON lock_wait_timeout 31536000 locked_in_memory OFF log OFF log_bin ON log_bin_trust_function_creators OFF log_error /var/lib/mysql/VM84.err log_output FILE log_queries_not_using_indexes OFF log_slave_updates OFF log_slow_queries ON log_warnings 1 long_query_time 2.000000 low_priority_updates OFF lower_case_file_system OFF lower_case_table_names 0 max_allowed_packet 16777216 max_binlog_cache_size 18446744073709547520 max_binlog_size 1073741824 max_binlog_stmt_cache_size 18446744073709547520 max_connect_errors 1024 max_connections 2048 max_delayed_threads 20 max_error_count 64 max_heap_table_size 67108864 max_insert_delayed_threads 20 max_join_size 18446744073709551615 max_length_for_sort_data 1024 max_long_data_size 16777216<span 本文系统来源：http://www.cnblogs.com/wang1204/p/6617686.html
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