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mysql-show processlist命令 详解(转)

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原文地址:http://blog.csdn.net/e421083458/article/details/38342051

 

    SHOW PROCESSLIST显示哪些线程正在运行。您也可以使用mysqladmin processlist语句得到此信息。如果您有SUPER权限,您可以看到所有线程。否则,您只能看到您自己的线程(也就是,与您正在使用的MySQL账户相关的线程)。请参见13.5.5.3节,“KILL语法”。如果您不使用FULL关键词,则只显示每个查询的前100个字符。


本语句报告TCP/IP连接的主机名称(采用host_name:client_port格式),以方便地判定哪个客户端正在做什么。

如果您得到“too many connections”错误信息,并且想要了解正在发生的情况,本语句是非常有用的。MySQL保留一个额外的连接,让拥有SUPER权限的 账户使用,以确保管理员能够随时连接和检查系统(假设您没有把此权限给予所有的用户)。 


 

 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;
  1. mysql> show status;  
  2. +------------------------------------------+----------------------+  
  3. | Variable_name                            | Value                |  
  4. +------------------------------------------+----------------------+  
  5. | Aborted_clients                          | 777                  |  
  6. | Aborted_connects                         | 16                   |  
  7. | Binlog_cache_disk_use                    | 532                  |  
  8. | Binlog_cache_use                         | 8333221              |  
  9. | Binlog_stmt_cache_disk_use               | 0                    |  
  10. | Binlog_stmt_cache_use                    | 18732                |  
  11. | Bytes_received                           | 303                  |  
  12. | Bytes_sent                               | 12460                |  
  13. | Com_admin_commands                       | 0                    |  
  14. | Com_assign_to_keycache                   | 0                    |  
  15. | Com_alter_db                             | 0                    |  
  16. | Com_alter_db_upgrade                     | 0                    |  
  17. | Com_alter_event                          | 0                    |  
  18. | Com_alter_function                       | 0                    |  
  19. | Com_alter_procedure                      | 0                    |  
  20. | Com_alter_server                         | 0                    |  
  21. | Com_alter_table                          | 0                    |  
  22. | Com_alter_tablespace                     | 0                    |  
  23. | Com_analyze                              | 0                    |  
  24. | Com_begin                                | 0                    |  
  25. | Com_binlog                               | 0                    |  
  26. | Com_call_procedure                       | 0                    |  
  27. | Com_change_db                            | 0                    |  
  28. | Com_change_master                        | 0                    |  
  29. | Com_check                                | 0                    |  
  30. | Com_checksum                             | 0                    |  
  31. | Com_commit                               | 0                    |  
  32. | Com_create_db                            | 0                    |  
  33. | Com_create_event                         | 0                    |  
  34. | Com_create_function                      | 0                    |  
  35. | Com_create_index                         | 0                    |  
  36. | Com_create_procedure                     | 0                    |  
  37. | Com_create_server                        | 0                    |  
  38. | Com_create_table                         | 0                    |  
  39. | Com_create_trigger                       | 0                    |  
  40. | Com_create_udf                           | 0                    |  
  41. | Com_create_user                          | 0                    |  
  42. | Com_create_view                          | 0                    |  
  43. | Com_dealloc_sql                          | 0                    |  
  44. | Com_delete                               | 0                    |  
  45. | Com_delete_multi                         | 0                    |  
  46. | Com_do                                   | 0                    |  
  47. | Com_drop_db                              | 0                    |  
  48. | Com_drop_event                           | 0                    |  
  49. | Com_drop_function                        | 0                    |  
  50. | Com_drop_index                           | 0                    |  
  51. | Com_drop_procedure                       | 0                    |  
  52. | Com_drop_server                          | 0                    |  
  53. | Com_drop_table                           | 0                    |  
  54. | Com_drop_trigger                         | 0                    |  
  55. | Com_drop_user                            | 0                    |  
  56. | Com_drop_view                            | 0                    |  
  57. | Com_empty_query                          | 0                    |  
  58. | Com_execute_sql                          | 0                    |  
  59. | Com_flush                                | 0                    |  
  60. | Com_grant                                | 0                    |  
  61. | Com_ha_close                             | 0                    |  
  62. | Com_ha_open                              | 0                    |  
  63. | Com_ha_read                              | 0                    |  
  64. | Com_help                                 | 0                    |  
  65. | Com_insert                               | 0                    |  
  66. | Com_insert_select                        | 0                    |  
  67. | Com_install_plugin                       | 0                    |  
  68. | Com_kill                                 | 0                    |  
  69. | Com_load                                 | 0                    |  
  70. | Com_lock_tables                          | 0                    |  
  71. | Com_optimize                             | 0                    |  
  72. | Com_preload_keys                         | 0                    |  
  73. | Com_prepare_sql                          | 0                    |  
  74. | Com_purge                                | 0                    |  
  75. | Com_purge_before_date                    | 0                    |  
  76. | Com_release_savepoint                    | 0                    |  
  77. | Com_rename_table                         | 0                    |  
  78. | Com_rename_user                          | 0                    |  
  79. | Com_repair                               | 0                    |  
  80. | Com_replace                              | 0                    |  
  81. | Com_replace_select                       | 0                    |  
  82. | Com_reset                                | 0                    |  
  83. | Com_resignal                             | 0                    |  
  84. | Com_revoke                               | 0                    |  
  85. | Com_revoke_all                           | 0                    |  
  86. | Com_rollback                             | 0                    |  
  87. | Com_rollback_to_savepoint                | 0                    |  
  88. | Com_savepoint                            | 0                    |  
  89. | Com_select                               | 1                    |  
  90. | Com_set_option                           | 0                    |  
  91. | Com_signal                               | 0                    |  
  92. | Com_show_authors                         | 0                    |  
  93. | Com_show_binlog_events                   | 0                    |  
  94. | Com_show_binlogs                         | 0                    |  
  95. | Com_show_charsets                        | 0                    |  
  96. | Com_show_collations                      | 0                    |  
  97. | Com_show_contributors                    | 0                    |  
  98. | Com_show_create_db                       | 0                    |  
  99. | Com_show_create_event                    | 0                    |  
  100. | Com_show_create_func                     | 0                    |  
  101. | Com_show_create_proc                     | 0                    |  
  102. | Com_show_create_table                    | 0                    |  
  103. | Com_show_create_trigger                  | 0                    |  
  104. | Com_show_databases                       | 0                    |  
  105. | Com_show_engine_logs                     | 0                    |  
  106. | Com_show_engine_mutex                    | 0                    |  
  107. | Com_show_engine_status                   | 0                    |  
  108. | Com_show_events                          | 0                    |  
  109. | Com_show_errors                          | 0                    |  
  110. | Com_show_fields                          | 0                    |  
  111. | Com_show_function_status                 | 0                    |  
  112. | Com_show_grants                          | 0                    |  
  113. | Com_show_keys                            | 0                    |  
  114. | Com_show_master_status                   | 0                    |  
  115. | Com_show_open_tables                     | 0                    |  
  116. | Com_show_plugins                         | 0                    |  
  117. | Com_show_privileges                      | 0                    |  
  118. | Com_show_procedure_status                | 0                    |  
  119. | Com_show_processlist                     | 6                    |  
  120. | Com_show_profile                         | 0                    |  
  121. | Com_show_profiles                        | 0                    |  
  122. | Com_show_relaylog_events                 | 0                    |  
  123. | Com_show_slave_hosts                     | 0                    |  
  124. | Com_show_slave_status                    | 0                    |  
  125. | Com_show_status                          | 2                    |  
  126. | Com_show_storage_engines                 | 0                    |  
  127. | Com_show_table_status                    | 0                    |  
  128. | Com_show_tables                          | 0                    |  
  129. | Com_show_triggers                        | 0                    |  
  130. | Com_show_variables                       | 0                    |  
  131. | Com_show_warnings                        | 0                    |  
  132. | Com_slave_start                          | 0                    |  
  133. | Com_slave_stop                           | 0                    |  
  134. | Com_stmt_close                           | 0                    |  
  135. | Com_stmt_execute                         | 0                    |  
  136. | Com_stmt_fetch                           | 0                    |  
  137. | Com_stmt_prepare                         | 0                    |  
  138. | Com_stmt_reprepare                       | 0                    |  
  139. | Com_stmt_reset                           | 0                    |  
  140. | Com_stmt_send_long_data                  | 0                    |  
  141. | Com_truncate                             | 0                    |  
  142. | Com_uninstall_plugin                     | 0                    |  
  143. | Com_unlock_tables                        | 0                    |  
  144. | Com_update                               | 0                    |  
  145. | Com_update_multi                         | 0                    |  
  146. | Com_xa_commit                            | 0                    |  
  147. | Com_xa_end                               | 0                    |  
  148. | Com_xa_prepare                           | 0                    |  
  149. | Com_xa_recover                           | 0                    |  
  150. | Com_xa_rollback                          | 0                    |  
  151. | Com_xa_start                             | 0                    |  
  152. | Compression                              | OFF                  |  
  153. | Connections                              | 1107216              |  
  154. | Created_tmp_disk_tables                  | 0                    |  
  155. | Created_tmp_files                        | 564                  |  
  156. | Created_tmp_tables                       | 0                    |  
  157. | Delayed_errors                           | 0                    |  
  158. | Delayed_insert_threads                   | 0                    |  
  159. | Delayed_writes                           | 0                    |  
  160. | Flush_commands                           | 1                    |  
  161. | Handler_commit                           | 0                    |  
  162. | Handler_delete                           | 0                    |  
  163. | Handler_discover                         | 0                    |  
  164. | Handler_prepare                          | 0                    |  
  165. | Handler_read_first                       | 0                    |  
  166. | Handler_read_key                         | 0                    |  
  167. | Handler_read_last                        | 0                    |  
  168. | Handler_read_next                        | 0                    |  
  169. | Handler_read_prev                        | 0                    |  
  170. | Handler_read_rnd                         | 0                    |  
  171. | Handler_read_rnd_next                    | 0                    |  
  172. | Handler_rollback                         | 0                    |  
  173. | Handler_savepoint                        | 0                    |  
  174. | Handler_savepoint_rollback               | 0                    |  
  175. | Handler_update                           | 0                    |  
  176. | Handler_write                            | 0                    |  
  177. | Innodb_buffer_pool_pages_data            | 376178               |  
  178. | Innodb_buffer_pool_bytes_data            | 4261109760           |  
  179. | Innodb_buffer_pool_pages_dirty           | 0                    |  
  180. | Innodb_buffer_pool_bytes_dirty           | 0                    |  
  181. | Innodb_buffer_pool_pages_flushed         | 4419408              |  
  182. | Innodb_buffer_pool_pages_free            | 0                    |  
  183. | Innodb_buffer_pool_pages_misc            | 18446744073709437581 |  
  184. | Innodb_buffer_pool_pages_total           | 262143               |  
  185. | Innodb_buffer_pool_read_ahead_rnd        | 0                    |  
  186. | Innodb_buffer_pool_read_ahead            | 506357               |  
  187. | Innodb_buffer_pool_read_ahead_evicted    | 49891                |  
  188. | Innodb_buffer_pool_read_requests         | 3550554620           |  
  189. | Innodb_buffer_pool_reads                 | 8777938              |  
  190. | Innodb_buffer_pool_wait_free             | 0                    |  
  191. | Innodb_buffer_pool_write_requests        | 159577779            |  
  192. | Innodb_data_fsyncs                       | 13359191             |  
  193. | Innodb_data_pending_fsyncs               | 0                    |  
  194. | Innodb_data_pending_reads                | 0                    |  
  195. | Innodb_data_pending_writes               | 0                    |  
  196. | Innodb_data_read                         | 133311885312         |  
  197. | Innodb_data_reads                        | 9323868              |  
  198. | Innodb_data_writes                       | 17580993             |  
  199. | Innodb_data_written                      | 163731449856         |  
  200. | Innodb_dblwr_pages_written               | 4419408              |  
  201. | Innodb_dblwr_writes                      | 119202               |  
  202. | Innodb_have_atomic_builtins              | ON                   |  
  203. | Innodb_log_waits                         | 0                    |  
  204. | Innodb_log_write_requests                | 39730223             |  
  205. | Innodb_log_writes                        | 12957426             |  
  206. | Innodb_os_log_fsyncs                     | 13004841             |  
  207. | Innodb_os_log_pending_fsyncs             | 0                    |  
  208. | Innodb_os_log_pending_writes             | 0                    |  
  209. | Innodb_os_log_written                    | 25546702336          |  
  210. | Innodb_page_size                         | 16384                |  
  211. | Innodb_pages_created                     | 539547               |  
  212. | Innodb_pages_read                        | 9323581              |  
  213. | Innodb_pages_written                     | 4419408              |  
  214. | Innodb_row_lock_current_waits            | 0                    |  
  215. | Innodb_row_lock_time                     | 26866245             |  
  216. | Innodb_row_lock_time_avg                 | 1367                 |  
  217. | Innodb_row_lock_time_max                 | 55497                |  
  218. | Innodb_row_lock_waits                    | 19649                |  
  219. | Innodb_rows_deleted                      | 15511                |  
  220. | Innodb_rows_inserted                     | 1868056              |  
  221. | Innodb_rows_read                         | 1657696248           |  
  222. | Innodb_rows_updated                      | 7778106              |  
  223. | Innodb_truncated_status_writes           | 0                    |  
  224. | Key_blocks_not_flushed                   | 0                    |  
  225. | Key_blocks_unused                        | 26773                |  
  226. | Key_blocks_used                          | 19                   |  
  227. | Key_read_requests                        | 67555                |  
  228. | Key_reads                                | 19                   |  
  229. | Key_write_requests                       | 69364                |  
  230. | Key_writes                               | 11544                |  
  231. | Last_query_cost                          | 0.000000             |  
  232. | Max_used_connections                     | 436                  |  
  233. | Not_flushed_delayed_rows                 | 0                    |  
  234. | Open_files                               | 99                   |  
  235. | Open_streams                             | 0                    |  
  236. | Open_table_definitions                   | 327                  |  
  237. | Open_tables                              | 1301                 |  
  238. | Opened_files                             | 22851                |  
  239. | Opened_table_definitions                 | 0                    |  
  240. | Opened_tables                            | 0                    |  
  241. | Performance_schema_cond_classes_lost     | 0                    |  
  242. | Performance_schema_cond_instances_lost   | 0                    |  
  243. | Performance_schema_file_classes_lost     | 0                    |  
  244. | Performance_schema_file_handles_lost     | 0                    |  
  245. | Performance_schema_file_instances_lost   | 0                    |  
  246. | Performance_schema_locker_lost           | 0                    |  
  247. | Performance_schema_mutex_classes_lost    | 0                    |  
  248. | Performance_schema_mutex_instances_lost  | 0                    |  
  249. | Performance_schema_rwlock_classes_lost   | 0                    |  
  250. | Performance_schema_rwlock_instances_lost | 0                    |  
  251. | Performance_schema_table_handles_lost    | 0                    |  
  252. | Performance_schema_table_instances_lost  | 0                    |  
  253. | Performance_schema_thread_classes_lost   | 0                    |  
  254. | Performance_schema_thread_instances_lost | 0                    |  
  255. | Prepared_stmt_count                      | 0                    |  
  256. | Qcache_free_blocks                       | 3426                 |  
  257. | Qcache_free_memory                       | 38784160             |  
  258. | Qcache_hits                              | 9223399              |  
  259. | Qcache_inserts                           | 3505151              |  
  260. | Qcache_lowmem_prunes                     | 0                    |  
  261. | Qcache_not_cached                        | 400457               |  
  262. | Qcache_queries_in_cache                  | 19336                |  
  263. | Qcache_total_blocks                      | 42289                |  
  264. | Queries                                  | 27883378             |  
  265. | Questions                                | 9                    |  
  266. | Rpl_status                               | AUTH_MASTER          |  
  267. | Select_full_join                         | 0                    |  
  268. | Select_full_range_join                   | 0                    |  
  269. | Select_range                             | 0                    |  
  270. | Select_range_check                       | 0                    |  
  271. | Select_scan                              | 0                    |  
  272. | Slave_heartbeat_period                   | 0.000                |  
  273. | Slave_open_temp_tables                   | 0                    |  
  274. | Slave_received_heartbeats                | 0                    |  
  275. | Slave_retried_transactions               | 0                    |  
  276. | Slave_running                            | OFF                  |  
  277. | Slow_launch_threads                      | 30                   |  
  278. | Slow_queries                             | 0                    |  
  279. | Sort_merge_passes                        | 0                    |  
  280. | Sort_range                               | 0                    |  
  281. | Sort_rows                                | 0                    |  
  282. | Sort_scan                                | 0                    |  
  283. | Ssl_accept_renegotiates                  | 0                    |  
  284. | Ssl_accepts                              | 0                    |  
  285. | Ssl_callback_cache_hits                  | 0                    |  
  286. | Ssl_cipher                               |                      |  
  287. | Ssl_cipher_list                          |                      |  
  288. | Ssl_client_connects                      | 0                    |  
  289. | Ssl_connect_renegotiates                 | 0                    |  
  290. | Ssl_ctx_verify_depth                     | 0                    |  
  291. | Ssl_ctx_verify_mode                      | 0                    |  
  292. | Ssl_default_timeout                      | 0                    |  
  293. | Ssl_finished_accepts                     | 0                    |  
  294. | Ssl_finished_connects                    | 0                    |  
  295. | Ssl_session_cache_hits                   | 0                    |  
  296. | Ssl_session_cache_misses                 | 0                    |  
  297. | Ssl_session_cache_mode                   | NONE                 |  
  298. | Ssl_session_cache_overflows              | 0                    |  
  299. | Ssl_session_cache_size                   | 0                    |  
  300. | Ssl_session_cache_timeouts               | 0                    |  
  301. | Ssl_sessions_reused                      | 0                    |  
  302. | Ssl_used_session_cache_entries           | 0                    |  
  303. | Ssl_verify_depth                         | 0                    |  
  304. | Ssl_verify_mode                          | 0                    |  
  305. | Ssl_version                              |                      |  
  306. | Table_locks_immediate                    | 13127661             |  
  307. | Table_locks_waited                       | 648                  |  
  308. | Tc_log_max_pages_used                    | 0                    |  
  309. | Tc_log_page_size                         | 0                    |  
  310. | Tc_log_page_waits                        | 6                    |  
  311. | Threads_cached                           | 7                    |  
  312. | Threads_connected                        | 2                    |  
  313. | Threads_created                          | 54593                |  
  314. | Threads_running                          | 2                    |  
  315. | Uptime                                   | 651324               |  
  316. | Uptime_since_flush_status                | 651324               |  
  317. +------------------------------------------+----------------------+  
  318. 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:


 

 

 

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