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1、什么是performance_schema
MySQL的performance schema 用于監控MySQL server在一個較低級別的運行過程中的資源消耗、資源等待等情況，它具有以下特點：
a、提供了一種在數據庫運行時實時檢查server的內部執行情況的方法。performance_schema 數據庫中的表使用performance_schema存儲引擎。該數據庫主要關注數據庫運行過程中的性能相關的數據，與information_schema不同，information_schema主要關注server運行過程中的元數據信息。
b、performance_schema通過監視server的事件來實現監視server內部運行情況， “事件”就是server內部活動中所做的任何事情以及對應的時間消耗，利用這些信息來判斷server中的相關資源消耗在了哪里?一般來說，事件可以是函數調用、操作系統的等待、SQL語句執行的階段(如sql語句執行過程中的parsing 或 sorting階段)或者整個SQL語句與SQL語句集合。事件的采集可以方便的提供server中的相關存儲引擎對磁盤文件、表I/O、表鎖等資源的同步調用信息。
c、performance_schema中的事件與寫入二進制日志中的事件(描述數據修改的events)、事件計劃調度程序(這是一種存儲程序)的事件不同。performance_schema中的事件記錄的是server執行某些活動對某些資源的消耗、耗時、這些活動執行的次數等情況。
d、performance_schema中的事件只記錄在本地server的performance_schema中，其下的這些表中數據發生變化時不會被寫入binlog中，也不會通過復制機制被復制到其他server中。
e、當前活躍事件、歷史事件和事件摘要相關的表中記錄的信息。能提供某個事件的執行次數、使用時長。進而可用于分析某個特定線程、特定對象(如mutex或file)相關聯的活動。
f、performance_schema存儲引擎使用server源代碼中的“檢測點”來實現事件數據的收集。對于performance_schema實現機制本身的代碼沒有相關的單獨線程來檢測，這與其他功能(如復制或事件計劃程序)不同。
g、收集的事件數據存儲在performance_schema數據庫的表中。這些表可以使用SELECT語句查詢，也可以使用SQL語句更新performance_schema數據庫中的表記錄(如動態修改performance_schema的setup_*開頭的幾個配置表，但要注意：配置表的更改會立即生效，這會影響數據收集)。
h、performance_schema的表中的數據不會持久化存儲在磁盤中，而是保存在內存中，一旦服務器重啟，這些數據會丟失(包括配置表在內的整個performance_schema下的所有數據)。
i、MySQL支持的所有平臺中事件監控功能都可用，但不同平臺中用于統計事件時間開銷的計時器類型可能會有所差異。
performance_schema實現機制遵循以下設計目標：
啟用performance_schema不會導致server的行為發生變化。例如，它不會改變線程調度機制，不會導致查詢執行計劃(如EXPLAIN)發生變化。
啟用performance_schema之后，server會持續不間斷地監測，開銷很小。不會導致server不可用。
在該實現機制中沒有增加新的關鍵字或語句，解析器不會變化。
即使performance_schema的監測機制在內部對某事件執行監測失敗，也不會影響server正常運行。
如果在開始收集事件數據時碰到有其他線程正在針對這些事件信息進行查詢，那么查詢會優先執行事件數據的收集，因為事件數據的收集是一個持續不斷的過程，而檢索(查詢)這些事件數據僅僅只是在需要查看的時候才進行檢索。也可能某些事件數據永遠都不會去檢索。
需要很容易地添加新的instruments監測點。
instruments(事件采集項)代碼版本化：如果instruments的代碼發生了變更，舊的instruments代碼還可以繼續工作。
注意：MySQL sys schema是一組對象(包括相關的視圖、存儲過程和函數)，可以方便地訪問performance_schema收集的數據。同時檢索的數據可讀性也更高(例如：performance_schema中的時間單位是皮秒，經過sys schema查詢時會轉換為可讀的us,ms,s,min,hour,day等單位)，sys schem在5.7.x版本默認安裝。
2、performance_schema使用快速入門
2.1檢查當前數據庫版本是否支持
performance_schema被視為存儲引擎。
root@[(none)]> select version();
+------------+
| version() |
+------------+
| 5.7.21-log |
+------------+
1 row in set (0.00 sec)
root@[(none)]> select engine,support from information_schema.engines where engine='PERFORMANCE_SCHEMA';
+--------------------+---------+
| engine | support |
+--------------------+---------+
| PERFORMANCE_SCHEMA | YES |
+--------------------+---------+
1 row in set (0.00 sec)
root@[(none)]> show engines;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
| MyISAM | YES | MyISAM storage engine | NO | NO | NO |
| FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL |
| CSV | YES | CSV storage engine | NO | NO | NO |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
9 rows in set (0.00 sec)
root@[(none)]> show variables like 'performance_schema';
+--------------------+-------+
| Variable_name | Value |
+--------------------+-------+
| performance_schema | ON |
+--------------------+-------+
1 row in set (0.01 sec)
該參數為只讀參數，需要在實例啟動之前設置才生效，performance_schema在5.7.x及其以上版本中默認啟用(5.6.x及其以下版本默認關閉)，如果要顯式啟用或關閉時，我們需要使用參數performance_schema=ON|OFF設置。
mysqld啟動之后，通過如下語句查看performance_schema是否啟用生效(值為ON表示performance_schema已初始化成功且可以使用了。如果值為OFF表示在啟用performance_schema時發生某些錯誤。可以查看錯誤日志進行排查)。
可以使用select table_name from information_schema.tables where table_schema='performance_schema' and engine='performance_schema';查詢哪些表使用performance_schema引擎，
或者直接在performance_schema庫下用show tables;或直接使用show tables from performance_schema;語句來查詢該庫有哪些表。
root@[performance_schema]> show tables from performance_schema;
+------------------------------------------------------+
| Tables_in_performance_schema |
+------------------------------------------------------+
| accounts |
| cond_instances |
| events_stages_current |
| events_stages_history |
| events_stages_history_long |
| events_stages_summary_by_account_by_event_name |
| events_stages_summary_by_host_by_event_name |
| events_stages_summary_by_thread_by_event_name |
| events_stages_summary_by_user_by_event_name |
| events_stages_summary_global_by_event_name |
| events_statements_current |
| events_statements_history |
| events_statements_history_long |
| events_statements_summary_by_account_by_event_name |
| events_statements_summary_by_digest |
| events_statements_summary_by_host_by_event_name |
| events_statements_summary_by_program |
| events_statements_summary_by_thread_by_event_name |
| events_statements_summary_by_user_by_event_name |
| events_statements_summary_global_by_event_name |
| events_transactions_current |
| events_transactions_history |
| events_transactions_history_long |
| events_transactions_summary_by_account_by_event_name |
| events_transactions_summary_by_host_by_event_name |
| events_transactions_summary_by_thread_by_event_name |
| events_transactions_summary_by_user_by_event_name |
| events_transactions_summary_global_by_event_name |
| events_waits_current |
| events_waits_history |
| events_waits_history_long |
| events_waits_summary_by_account_by_event_name |
| events_waits_summary_by_host_by_event_name |
| events_waits_summary_by_instance |
| events_waits_summary_by_thread_by_event_name |
| events_waits_summary_by_user_by_event_name |
| events_waits_summary_global_by_event_name |
| file_instances |
| file_summary_by_event_name |
| file_summary_by_instance |
| global_status |
| global_variables |
| host_cache |
| hosts |
| memory_summary_by_account_by_event_name |
| memory_summary_by_host_by_event_name |
| memory_summary_by_thread_by_event_name |
| memory_summary_by_user_by_event_name |
| memory_summary_global_by_event_name |
| metadata_locks |
| mutex_instances |
| objects_summary_global_by_type |
| performance_timers |
| prepared_statements_instances |
| replication_applier_configuration |
| replication_applier_status |
| replication_applier_status_by_coordinator |
| replication_applier_status_by_worker |
| replication_connection_configuration |
| replication_connection_status |
| replication_group_member_stats |
| replication_group_members |
| rwlock_instances |
| session_account_connect_attrs |
| session_connect_attrs |
| session_status |
| session_variables |
| setup_actors |
| setup_consumers |
| setup_instruments |
| setup_objects |
| setup_timers |
| socket_instances |
| socket_summary_by_event_name |
| socket_summary_by_instance |
| status_by_account |
| status_by_host |
| status_by_thread |
| status_by_user |
| table_handles |
| table_io_waits_summary_by_index_usage |
| table_io_waits_summary_by_table |
| table_lock_waits_summary_by_table |
| threads |
| user_variables_by_thread |
| users |
| variables_by_thread |
+------------------------------------------------------+
87 rows in set (0.00 sec)
2.3、performance_schema表的分類
按照事件類型分組記錄性能事件數據的表
語句事件記錄表，這些表記錄了語句事件信息：
events_statements_current當前語句事件表
events_statements_history歷史語句事件表
events_statements_history_long長語句歷史事件表
summary聚合后的摘要表
account帳號
host主機
program程序
thread線程
user用戶
global全局
memory內存
file文件系統
root@[performance_schema]> show tables like 'events_statement%';
+----------------------------------------------------+
| Tables_in_performance_schema (events_statement%) |
+----------------------------------------------------+
| events_statements_current |
| events_statements_history |
| events_statements_history_long |
| events_statements_summary_by_account_by_event_name |
| events_statements_summary_by_digest |
| events_statements_summary_by_host_by_event_name |
| events_statements_summary_by_program |
| events_statements_summary_by_thread_by_event_name |
| events_statements_summary_by_user_by_event_name |
| events_statements_summary_global_by_event_name |
+----------------------------------------------------+
10 rows in set (0.00 sec)
root@[performance_schema]> show tables like 'events_wait%';
+-----------------------------------------------+
| Tables_in_performance_schema (events_wait%) |
+-----------------------------------------------+
| events_waits_current |
| events_waits_history |
| events_waits_history_long |
| events_waits_summary_by_account_by_event_name |
| events_waits_summary_by_host_by_event_name |
| events_waits_summary_by_instance |
| events_waits_summary_by_thread_by_event_name |
| events_waits_summary_by_user_by_event_name |
| events_waits_summary_global_by_event_name |
+-----------------------------------------------+
9 rows in set (0.00 sec)
2.4、performance_schema簡單配置與使用
打開等待事件的采集器配置項開關，需要修改setup_instruments 配置表中對應的采集器配置項。
root@[performance_schema]> update setup_instruments set enabled = 'YES', timed = 'YES'where name like 'wait%';
Query OK, 265 rows affected (0.03 sec)
Rows matched: 319 Changed: 265 Warnings: 0
打開等待事件的保存表配置開關，修改修改setup_consumers 配置表中對應的配置項。
update setup_consumers set enabled = 'YES' where name like '%wait%';
root@[performance_schema]> update setup_consumers set enabled = 'YES' where name like '%wait%';
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3 Changed: 3 Warnings: 0
配置好之后，我們就可以查看server當前正在做什么，可以通過查詢events_waits_current表來得知，該表中每個線程只包含一行數據，用于顯示每個線程的最新監視事件(正在做的事情)：
select * from events_waits_current\G
root@[performance_schema]> select * from events_waits_current\G
*************************** 1. row ***************************
THREAD_ID: 1
EVENT_ID: 144
END_EVENT_ID: 144
EVENT_NAME: wait/synch/mutex/sql/LOCK_thread_cache
SOURCE: connection_handler_per_thread.cc:370
TIMER_START: 9865686496806223209
TIMER_END: 9865686496806280449
TIMER_WAIT: 57240
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 31970336
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: lock
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 2. row ***************************
THREAD_ID: 13
EVENT_ID: 6723
END_EVENT_ID: 6723
EVENT_NAME: wait/synch/mutex/innodb/buf_dblwr_mutex
SOURCE: buf0dblwr.cc:954
TIMER_START: 9865691303536408077
TIMER_END: 9865691303536442421
TIMER_WAIT: 34344
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 210662264
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: lock
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 3. row ***************************
THREAD_ID: 15
EVENT_ID: 168
END_EVENT_ID: 168
EVENT_NAME: wait/synch/mutex/innodb/lock_wait_mutex
SOURCE: lock0wait.cc:508
TIMER_START: 9865691970349175964
TIMER_END: 9865691970349277565
TIMER_WAIT: 101601
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 140228193497336
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: lock
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 4. row ***************************
THREAD_ID: 16
EVENT_ID: 507
END_EVENT_ID: 507
EVENT_NAME: wait/synch/mutex/innodb/sync_array_mutex
SOURCE: sync0arr.cc:1162
TIMER_START: 9865691865480898161
TIMER_END: 9865691865481034106
TIMER_WAIT: 135945
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 36898896
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: lock
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 5. row ***************************
THREAD_ID: 18
EVENT_ID: 2664
END_EVENT_ID: 2664
EVENT_NAME: wait/synch/mutex/innodb/flush_list_mutex
SOURCE: buf0buf.cc:418
TIMER_START: 9865691341648206750
TIMER_END: 9865691341648243956
TIMER_WAIT: 37206
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 40103504
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: lock
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 6. row ***************************
THREAD_ID: 24
EVENT_ID: 16
END_EVENT_ID: 16
EVENT_NAME: wait/synch/mutex/innodb/recalc_pool_mutex
SOURCE: dict0stats_bg.cc:165
TIMER_START: 9865682559078110424
TIMER_END: 9865682559078668514
TIMER_WAIT: 558090
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 32525376
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: lock
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 7. row ***************************
THREAD_ID: 2342731
EVENT_ID: 44
END_EVENT_ID: 44
EVENT_NAME: wait/synch/mutex/mysys/IO_CACHE::append_buffer_lock
SOURCE: mf_iocache.c:1531
TIMER_START: 9865680439566973626
TIMER_END: 9865680439567029435
TIMER_WAIT: 55809
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 212862648
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: lock
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 8. row ***************************
THREAD_ID: 2342732
EVENT_ID: 2240
END_EVENT_ID: NULL
EVENT_NAME: wait/synch/cond/sql/MYSQL_RELAY_LOG::update_cond
SOURCE: binlog.cc:7864
TIMER_START: 9865691864122605840
TIMER_END: 9865691988047400456
TIMER_WAIT: 123924794616
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 212863152
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: timed_wait
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 9. row ***************************
THREAD_ID: 2390264
EVENT_ID: 25159
END_EVENT_ID: NULL
EVENT_NAME: idle
SOURCE: socket_connection.cc:69
TIMER_START: 9853460924013000000
TIMER_END: 9853494292491000000
TIMER_WAIT: 33368478000000
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 0
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: idle
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 10. row ***************************
THREAD_ID: 2390268
EVENT_ID: 9170
END_EVENT_ID: NULL
EVENT_NAME: idle
SOURCE: socket_connection.cc:69
TIMER_START: 9853441910470000000
TIMER_END: 9853494292494000000
TIMER_WAIT: 52382024000000
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 0
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: idle
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 11. row ***************************
THREAD_ID: 2390984
EVENT_ID: 15701
END_EVENT_ID: NULL
EVENT_NAME: idle
SOURCE: socket_connection.cc:69
TIMER_START: 9853381882023000000
TIMER_END: 9853494292496000000
TIMER_WAIT: 112410473000000
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 0
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: idle
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 12. row ***************************
THREAD_ID: 2642025
EVENT_ID: 373
END_EVENT_ID: 373
EVENT_NAME: wait/synch/mutex/sql/THD::LOCK_query_plan
SOURCE: sql_class.h:1696
TIMER_START: 9865691987998918176
TIMER_END: 9865691987998979709
TIMER_WAIT: 61533
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 140226051725280
NESTING_EVENT_ID: 363
NESTING_EVENT_TYPE: STATEMENT
OPERATION: lock
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 13. row ***************************
THREAD_ID: 2627784
EVENT_ID: 9528
END_EVENT_ID: NULL
EVENT_NAME: idle
SOURCE: socket_connection.cc:69
TIMER_START: 9853374702212000000
TIMER_END: 9853494292502000000
TIMER_WAIT: 119590290000000
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 0
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: idle
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 14. row ***************************
THREAD_ID: 2572438
EVENT_ID: 19474
END_EVENT_ID: NULL
EVENT_NAME: idle
SOURCE: socket_connection.cc:69
TIMER_START: 9853381872622000000
TIMER_END: 9853494292504000000
TIMER_WAIT: 112419882000000
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 0
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: idle
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 15. row ***************************
THREAD_ID: 2641654
EVENT_ID: 1864
END_EVENT_ID: NULL
EVENT_NAME: idle
SOURCE: socket_connection.cc:69
TIMER_START: 9853440844046000000
TIMER_END: 9853494292506000000
TIMER_WAIT: 53448460000000
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 0
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: idle
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 16. row ***************************
THREAD_ID: 2515837
EVENT_ID: 8532
END_EVENT_ID: NULL
EVENT_NAME: idle
SOURCE: socket_connection.cc:69
TIMER_START: 9853441905775000000
TIMER_END: 9853494292509000000
TIMER_WAIT: 52386734000000
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 0
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: idle
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 17. row ***************************
THREAD_ID: 2390507
EVENT_ID: 9037
END_EVENT_ID: NULL
EVENT_NAME: idle
SOURCE: socket_connection.cc:69
TIMER_START: 9853441908947000000
TIMER_END: 9853494292511000000
TIMER_WAIT: 52383564000000
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 0
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
OPERATION: idle
NUMBER_OF_BYTES: NULL
FLAGS: NULL
*************************** 18. row ***************************
THREAD_ID: 2633808
EVENT_ID: 35
END_EVENT_ID: NULL
EVENT_NAME: wait/synch/cond/sql/MYSQL_BIN_LOG::update_cond
SOURCE: binlog.cc:7897
TIMER_START: 9865689922501825131
TIMER_END: 9865691988075541071
TIMER_WAIT: 2065573715940
SPINS: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
INDEX_NAME: NULL
OBJECT_TYPE: NULL
OBJECT_INSTANCE_BEGIN: 31973472
NESTING_EVENT_ID: 11
NESTING_EVENT_TYPE: STATEMENT
OPERATION: timed_wait
NUMBER_OF_BYTES: NULL
FLAGS: NULL
18 rows in set (0.00 sec)
#第12行事件信息表示線程ID為2642025的線程正在等待innodb存儲引擎的LOCK_query_plan鎖，這是innodb存儲引擎的一個互斥鎖，等待時間為61533皮秒如果該事件正在運行而沒有結束，那么TIMER_END和TIMER_WAIT的值顯示為NULL。
_current表中每個線程只保留一條記錄，且一旦線程完成工作，該表中不會再記錄該線程的事件信息，_history表中記錄每個線程已經執行完成的事件信息，但每個線程的只事件信息只記錄10條，再多就會被覆蓋掉，*_history_long表中記錄所有線程的事件信息，但總記錄數量是10000行，超過會被覆蓋掉，現在咱們查看一下歷史表events_waits_history 中記錄了什么：
root@[performance_schema]> select thread_id,event_id,event_name,timer_wait from events_waits_history order by thread_id;
+-----------+----------+-----------------------------------------------------+----------------+
| thread_id | event_id | event_name | timer_wait |
+-----------+----------+-----------------------------------------------------+----------------+
| 1 | 1541 | wait/synch/mutex/sql/LOCK_connection_count | 198909 |
| 1 | 1542 | wait/synch/mutex/sql/LOCK_thread_cache | 54378 |
| 1 | 1543 | wait/io/socket/sql/server_tcpip_socket | 3113856 |
| 1 | 1544 | wait/synch/mutex/sql/LOCK_connection_count | 184599 |
| 1 | 1545 | wait/synch/mutex/sql/LOCK_thread_cache | 50085 |
| 1 | 1546 | wait/io/socket/sql/server_tcpip_socket | 2233791 |
| 1 | 1547 | wait/synch/mutex/sql/LOCK_connection_count | 196047 |
| 1 | 1548 | wait/synch/mutex/sql/LOCK_thread_cache | 54378 |
| 1 | 1539 | wait/synch/mutex/sql/LOCK_thread_cache | 143100 |
| 1 | 1540 | wait/io/socket/sql/server_tcpip_socket | 3125304 |
| 4 | 1 | wait/synch/mutex/innodb/fil_system_mutex | 294786 |
| 4 | 2 | wait/synch/mutex/innodb/fil_system_mutex | 68688 |
| 4 | 3 | wait/io/file/innodb/innodb_log_file | 1378994598 |
| 4 | 4 | wait/synch/mutex/innodb/fil_system_mutex | 65826 |
| 4 | 5 | wait/synch/mutex/innodb/log_sys_mutex | 31482 |
| 9 | 131 | wait/synch/mutex/innodb/buf_pool_mutex | 62964 |
| 9 | 132 | wait/synch/mutex/innodb/flush_list_mutex | 77274 |
| 9 | 133 | wait/synch/mutex/innodb/fil_system_mutex | 74412 |
| 9 | 134 | wait/synch/mutex/innodb/buf_pool_mutex | 118773 |
| 9 | 135 | wait/synch/mutex/innodb/flush_list_mutex | 72981 |
| 9 | 136 | wait/synch/mutex/innodb/fil_system_mutex | 103032 |
| 9 | 137 | wait/synch/mutex/innodb/buf_pool_mutex | 32913 |
| 9 | 138 | wait/synch/mutex/innodb/flush_list_mutex | 74412 |
| 9 | 129 | wait/synch/mutex/innodb/flush_list_mutex | 61533 |
| 9 | 130 | wait/synch/mutex/innodb/fil_system_mutex | 334854 |
| 10 | 81 | wait/synch/mutex/innodb/flush_list_mutex | 30051 |
| 10 | 82 | wait/synch/mutex/innodb/fil_system_mutex | 35775 |
| 10 | 83 | wait/synch/mutex/innodb/buf_pool_mutex | 38637 |
| 10 | 84 | wait/synch/mutex/innodb/flush_list_mutex | 38637 |
| 10 | 85 | wait/synch/mutex/innodb/fil_system_mutex | 38637 |
| 10 | 86 | wait/synch/mutex/innodb/buf_pool_mutex | 37206 |
| 10 | 87 | wait/synch/mutex/innodb/flush_list_mutex | 38637 |
| 10 | 88 | wait/synch/mutex/innodb/fil_system_mutex | 30051 |
| 10 | 89 | wait/synch/mutex/innodb/buf_pool_mutex | 31482 |
| 10 | 90 | wait/synch/mutex/innodb/flush_list_mutex | 35775 |
| 13 | 76751 | wait/synch/mutex/innodb/buf_dblwr_mutex | 35775 |
| 13 | 76742 | wait/synch/mutex/innodb/buf_pool_mutex | 118773 |
| 13 | 76743 | wait/synch/mutex/innodb/buf_pool_mutex | 32913 |
| 13 | 76744 | wait/synch/mutex/innodb/flush_list_mutex | 135945 |
| 13 | 76745 | wait/synch/mutex/innodb/buf_pool_mutex | 32913 |
| 13 | 76746 | wait/synch/mutex/innodb/buf_dblwr_mutex | 31482 |
| 13 | 76747 | wait/synch/mutex/innodb/buf_pool_mutex | 108756 |
| 13 | 76748 | wait/synch/mutex/innodb/buf_pool_mutex | 31482 |
| 13 | 76749 | wait/synch/mutex/innodb/flush_list_mutex | 210357 |
| 13 | 76750 | wait/synch/mutex/innodb/buf_pool_mutex | 31482 |
| 15 | 1891 | wait/synch/mutex/innodb/lock_wait_mutex | 237546 |
| 15 | 1892 | wait/synch/mutex/innodb/lock_wait_mutex | 263304 |
| 15 | 1893 | wait/synch/mutex/innodb/lock_wait_mutex | 313389 |
| 15 | 1894 | wait/synch/mutex/innodb/lock_wait_mutex | 253287 |
| 15 | 1885 | wait/synch/mutex/innodb/lock_wait_mutex | 233253 |
| 15 | 1886 | wait/synch/mutex/innodb/lock_wait_mutex | 287631 |
| 15 | 1887 | wait/synch/mutex/innodb/lock_wait_mutex | 251856 |
| 15 | 1888 | wait/synch/mutex/innodb/lock_wait_mutex | 228960 |
| 15 | 1889 | wait/synch/mutex/innodb/lock_wait_mutex | 230391 |
| 15 | 1890 | wait/synch/mutex/innodb/lock_wait_mutex | 256149 |
| 16 | 5711 | wait/synch/mutex/innodb/log_sys_mutex | 402111 |
| 16 | 5712 | wait/synch/mutex/innodb/sync_array_mutex | 52947 |
| 16 | 5713 | wait/synch/mutex/innodb/sync_array_mutex | 50085 |
| 16 | 5704 | wait/synch/mutex/innodb/sync_array_mutex | 47223 |
| 16 | 5705 | wait/synch/mutex/innodb/log_sys_mutex | 698328 |
| 16 | 5706 | wait/synch/mutex/innodb/sync_array_mutex | 60102 |
| 16 | 5707 | wait/synch/mutex/innodb/sync_array_mutex | 40068 |
| 16 | 5708 | wait/synch/mutex/innodb/log_sys_mutex | 392094 |
| 16 | 5709 | wait/synch/mutex/innodb/sync_array_mutex | 58671 |
| 16 | 5710 | wait/synch/mutex/innodb/sync_array_mutex | 47223 |
| 18 | 30111 | wait/synch/mutex/innodb/flush_list_mutex | 34344 |
| 18 | 30112 | wait/synch/mutex/innodb/flush_list_mutex | 41499 |
| 18 | 30103 | wait/synch/mutex/innodb/log_sys_mutex | 32913 |
| 18 | 30104 | wait/synch/mutex/innodb/log_flush_order_mutex | 31482 |
| 18 | 30105 | wait/synch/mutex/innodb/flush_list_mutex | 87291 |
| 18 | 30106 | wait/synch/mutex/innodb/flush_list_mutex | 57240 |
| 18 | 30107 | wait/synch/mutex/innodb/flush_list_mutex | 47223 |
| 18 | 30108 | wait/synch/mutex/innodb/flush_list_mutex | 34344 |
| 18 | 30109 | wait/synch/mutex/innodb/flush_list_mutex | 40068 |
| 18 | 30110 | wait/synch/mutex/innodb/flush_list_mutex | 41499 |
| 24 | 181 | wait/synch/mutex/innodb/recalc_pool_mutex | 352026 |
| 24 | 182 | wait/synch/mutex/innodb/recalc_pool_mutex | 598158 |
| 24 | 183 | wait/synch/mutex/innodb/recalc_pool_mutex | 540918 |
| 24 | 184 | wait/synch/mutex/innodb/recalc_pool_mutex | 466506 |
| 24 | 185 | wait/synch/mutex/innodb/recalc_pool_mutex | 515160 |
| 24 | 186 | wait/synch/mutex/innodb/recalc_pool_mutex | 560952 |
| 24 | 187 | wait/synch/mutex/innodb/recalc_pool_mutex | 576693 |
| 24 | 188 | wait/synch/mutex/innodb/recalc_pool_mutex | 556659 |
| 24 | 189 | wait/synch/mutex/innodb/recalc_pool_mutex | 528039 |
| 24 | 180 | wait/synch/mutex/innodb/recalc_pool_mutex | 767016 |
| 2342731 | 501 | wait/synch/mutex/sql/Master_info::data_lock | 313389 |
| 2342731 | 502 | wait/synch/mutex/sql/Master_info::data_lock | 55809 |
| 2342731 | 503 | wait/synch/mutex/sql/MYSQL_RELAY_LOG::LOCK_log | 141669 |
| 2342731 | 504 | wait/synch/mutex/mysys/IO_CACHE::append_buffer_lock | 62964 |
| 2342731 | 495 | wait/synch/mutex/sql/MYSQL_RELAY_LOG::LOCK_log | 150255 |
| 2342731 | 496 | wait/synch/mutex/mysys/IO_CACHE::append_buffer_lock | 178875 |
| 2342731 | 497 | wait/synch/mutex/sql/Master_info::data_lock | 330561 |
| 2342731 | 498 | wait/synch/mutex/sql/Master_info::data_lock | 44361 |
| 2342731 | 499 | wait/synch/mutex/sql/MYSQL_RELAY_LOG::LOCK_log | 115911 |
| 2342731 | 500 | wait/synch/mutex/mysys/IO_CACHE::append_buffer_lock | 65826 |
| 2342732 | 25251 | wait/synch/mutex/sql/MYSQL_RELAY_LOG::LOCK_log | 38637 |
| 2342732 | 25252 | wait/synch/cond/sql/MYSQL_RELAY_LOG::update_cond | 300444355737 |
| 2342732 | 25253 | wait/synch/mutex/sql/THD::LOCK_current_cond | 193185 |
| 2342732 | 25254 | wait/synch/mutex/sql/key_mts_gaq_LOCK | 32913 |
| 2342732 | 25255 | wait/synch/mutex/sql/MYSQL_RELAY_LOG::LOCK_log | 38637 |
| 2342732 | 25246 | wait/synch/mutex/sql/key_mts_gaq_LOCK | 58671 |
| 2342732 | 25247 | wait/synch/mutex/sql/MYSQL_RELAY_LOG::LOCK_log | 42930 |
| 2342732 | 25248 | wait/synch/cond/sql/MYSQL_RELAY_LOG::update_cond | 300441407877 |
| 2342732 | 25249 | wait/synch/mutex/sql/THD::LOCK_current_cond | 206064 |
| 2342732 | 25250 | wait/synch/mutex/sql/key_mts_gaq_LOCK | 31482 |
| 2390264 | 32776 | wait/synch/mutex/sql/THD::LOCK_thd_data | 51516 |
| 2390264 | 32777 | wait/synch/mutex/sql/LOCK_table_cache | 61533 |
| 2390264 | 32778 | wait/io/socket/sql/client_connection | 33159132 |
| 2390264 | 32779 | wait/synch/mutex/sql/THD::LOCK_thd_query | 124497 |
| 2390264 | 32770 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2390264 | 32771 | wait/synch/mutex/innodb/trx_mutex | 42930 |
| 2390264 | 32772 | wait/synch/mutex/innodb/trx_mutex | 30051 |
| 2390264 | 32773 | wait/synch/mutex/sql/THD::LOCK_query_plan | 101601 |
| 2390264 | 32774 | wait/synch/mutex/innodb/trx_mutex | 45792 |
| 2390264 | 32775 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2390268 | 9278 | wait/synch/mutex/sql/THD::LOCK_query_plan | 105894 |
| 2390268 | 9279 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2390268 | 9280 | wait/synch/mutex/innodb/trx_mutex | 30051 |
| 2390268 | 9281 | wait/synch/mutex/sql/THD::LOCK_thd_data | 47223 |
| 2390268 | 9282 | wait/synch/mutex/sql/LOCK_table_cache | 61533 |
| 2390268 | 9283 | wait/io/socket/sql/client_connection | 20387457 |
| 2390268 | 9284 | wait/synch/mutex/sql/THD::LOCK_thd_query | 93015 |
| 2390268 | 9275 | wait/synch/mutex/innodb/trx_mutex | 30051 |
| 2390268 | 9276 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2390268 | 9277 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2390507 | 9511 | wait/synch/mutex/sql/THD::LOCK_thd_query | 58671 |
| 2390507 | 9502 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2390507 | 9503 | wait/synch/mutex/innodb/trx_mutex | 44361 |
| 2390507 | 9504 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2390507 | 9505 | wait/synch/mutex/sql/THD::LOCK_query_plan | 174582 |
| 2390507 | 9506 | wait/synch/mutex/innodb/trx_mutex | 40068 |
| 2390507 | 9507 | wait/synch/mutex/innodb/trx_mutex | 37206 |
| 2390507 | 9508 | wait/synch/mutex/sql/THD::LOCK_thd_data | 47223 |
| 2390507 | 9509 | wait/synch/mutex/sql/LOCK_table_cache | 100170 |
| 2390507 | 9510 | wait/io/socket/sql/client_connection | 21065751 |
| 2390984 | 16526 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 110187 |
| 2390984 | 16527 | wait/synch/mutex/sql/THD::LOCK_query_plan | 60102 |
| 2390984 | 16528 | wait/synch/rwlock/sql/LOCK_grant | 47223 |
| 2390984 | 16529 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 97308 |
| 2390984 | 16530 | wait/synch/mutex/sql/THD::LOCK_query_plan | 47223 |
| 2390984 | 16531 | wait/io/socket/sql/client_connection | 13540122 |
| 2390984 | 16532 | wait/synch/mutex/sql/THD::LOCK_thd_query | 55809 |
| 2390984 | 16523 | wait/synch/mutex/sql/THD::LOCK_thd_data | 110187 |
| 2390984 | 16524 | wait/synch/mutex/sql/THD::LOCK_thd_query | 51516 |
| 2390984 | 16525 | wait/synch/mutex/sql/LOCK_plugin | 74412 |
| 2515836 | 5217 | wait/synch/mutex/sql/THD::LOCK_thd_query | 211788 |
| 2515836 | 5208 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2515836 | 5209 | wait/synch/mutex/innodb/trx_mutex | 34344 |
| 2515836 | 5210 | wait/synch/mutex/innodb/trx_mutex | 30051 |
| 2515836 | 5211 | wait/synch/mutex/sql/THD::LOCK_query_plan | 85860 |
| 2515836 | 5212 | wait/synch/mutex/innodb/trx_mutex | 50085 |
| 2515836 | 5213 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2515836 | 5214 | wait/synch/mutex/sql/THD::LOCK_thd_data | 65826 |
| 2515836 | 5215 | wait/synch/mutex/sql/LOCK_table_cache | 72981 |
| 2515836 | 5216 | wait/io/socket/sql/client_connection | 14247036 |
| 2515837 | 9429 | wait/io/socket/sql/client_connection | 8451486 |
| 2515837 | 9430 | wait/synch/mutex/sql/THD::LOCK_thd_query | 57240 |
| 2515837 | 9421 | wait/synch/mutex/sql/THD::LOCK_thd_data | 131652 |
| 2515837 | 9422 | wait/synch/mutex/sql/THD::LOCK_thd_query | 30051 |
| 2515837 | 9423 | wait/synch/mutex/sql/LOCK_plugin | 55809 |
| 2515837 | 9424 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 186030 |
| 2515837 | 9425 | wait/synch/mutex/sql/THD::LOCK_query_plan | 35775 |
| 2515837 | 9426 | wait/synch/rwlock/sql/LOCK_grant | 42930 |
| 2515837 | 9427 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 51516 |
| 2515837 | 9428 | wait/synch/mutex/sql/THD::LOCK_query_plan | 37206 |
| 2572438 | 21193 | wait/io/socket/sql/client_connection | 7932033 |
| 2572438 | 21194 | wait/synch/mutex/sql/THD::LOCK_thd_query | 42930 |
| 2572438 | 21185 | wait/synch/mutex/sql/THD::LOCK_thd_data | 121635 |
| 2572438 | 21186 | wait/synch/mutex/sql/THD::LOCK_thd_query | 35775 |
| 2572438 | 21187 | wait/synch/mutex/sql/LOCK_plugin | 44361 |
| 2572438 | 21188 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 103032 |
| 2572438 | 21189 | wait/synch/mutex/sql/THD::LOCK_query_plan | 61533 |
| 2572438 | 21190 | wait/synch/rwlock/sql/LOCK_grant | 52947 |
| 2572438 | 21191 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 47223 |
| 2572438 | 21192 | wait/synch/mutex/sql/THD::LOCK_query_plan | 35775 |
| 2596129 | 12518 | wait/synch/mutex/sql/THD::LOCK_thd_query | 131652 |
| 2596129 | 12509 | wait/synch/mutex/sql/THD::LOCK_thd_data | 103032 |
| 2596129 | 12510 | wait/synch/mutex/sql/THD::LOCK_thd_query | 31482 |
| 2596129 | 12511 | wait/synch/mutex/sql/LOCK_plugin | 60102 |
| 2596129 | 12512 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 153117 |
| 2596129 | 12513 | wait/synch/mutex/sql/THD::LOCK_query_plan | 42930 |
| 2596129 | 12514 | wait/synch/rwlock/sql/LOCK_grant | 55809 |
| 2596129 | 12515 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 47223 |
| 2596129 | 12516 | wait/synch/mutex/sql/THD::LOCK_query_plan | 32913 |
| 2596129 | 12517 | wait/io/socket/sql/client_connection | 11087388 |
| 2622212 | 51042 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 61533 |
| 2622212 | 51043 | wait/synch/mutex/sql/THD::LOCK_query_plan | 55809 |
| 2622212 | 51044 | wait/io/socket/sql/client_connection | 8661843 |
| 2622212 | 51045 | wait/synch/mutex/sql/THD::LOCK_thd_query | 93015 |
| 2622212 | 51036 | wait/synch/mutex/sql/THD::LOCK_thd_data | 113049 |
| 2622212 | 51037 | wait/synch/mutex/sql/THD::LOCK_thd_query | 34344 |
| 2622212 | 51038 | wait/synch/mutex/sql/LOCK_plugin | 57240 |
| 2622212 | 51039 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 281907 |
| 2622212 | 51040 | wait/synch/mutex/sql/THD::LOCK_query_plan | 54378 |
| 2622212 | 51041 | wait/synch/rwlock/sql/LOCK_grant | 51516 |
| 2627784 | 10397 | wait/synch/mutex/sql/THD::LOCK_thd_query | 55809 |
| 2627784 | 10388 | wait/synch/mutex/sql/THD::LOCK_thd_data | 113049 |
| 2627784 | 10389 | wait/synch/mutex/sql/THD::LOCK_thd_query | 35775 |
| 2627784 | 10390 | wait/synch/mutex/sql/LOCK_plugin | 70119 |
| 2627784 | 10391 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 87291 |
| 2627784 | 10392 | wait/synch/mutex/sql/THD::LOCK_query_plan | 48654 |
| 2627784 | 10393 | wait/synch/rwlock/sql/LOCK_grant | 52947 |
| 2627784 | 10394 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 51516 |
| 2627784 | 10395 | wait/synch/mutex/sql/THD::LOCK_query_plan | 48654 |
| 2627784 | 10396 | wait/io/socket/sql/client_connection | 7940619 |
| 2633808 | 262 | wait/io/socket/sql/client_connection | 23180769 |
| 2633808 | 263 | wait/synch/cond/sql/MYSQL_BIN_LOG::update_cond | 15018642171477 |
| 2633808 | 264 | wait/io/socket/sql/client_connection | 40541661 |
| 2633808 | 255 | wait/synch/cond/sql/MYSQL_BIN_LOG::update_cond | 15018632104392 |
| 2633808 | 256 | wait/io/socket/sql/client_connection | 25239978 |
| 2633808 | 257 | wait/synch/cond/sql/MYSQL_BIN_LOG::update_cond | 15018629796189 |
| 2633808 | 258 | wait/io/socket/sql/client_connection | 25229961 |
| 2633808 | 259 | wait/synch/cond/sql/MYSQL_BIN_LOG::update_cond | 15018630958161 |
| 2633808 | 260 | wait/io/socket/sql/client_connection | 20210013 |
| 2633808 | 261 | wait/synch/cond/sql/MYSQL_BIN_LOG::update_cond | 15018631865415 |
| 2641525 | 11376 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 140238 |
| 2641525 | 11377 | wait/synch/mutex/sql/THD::LOCK_query_plan | 67257 |
| 2641525 | 11378 | wait/synch/rwlock/sql/LOCK_grant | 105894 |
| 2641525 | 11379 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 42930 |
| 2641525 | 11380 | wait/synch/mutex/sql/THD::LOCK_query_plan | 31482 |
| 2641525 | 11381 | wait/io/socket/sql/client_connection | 7933464 |
| 2641525 | 11382 | wait/synch/mutex/sql/THD::LOCK_thd_query | 75843 |
| 2641525 | 11373 | wait/synch/mutex/sql/THD::LOCK_thd_data | 154548 |
| 2641525 | 11374 | wait/synch/mutex/sql/THD::LOCK_thd_query | 34344 |
| 2641525 | 11375 | wait/synch/mutex/sql/LOCK_plugin | 60102 |
| 2641527 | 2279 | wait/synch/rwlock/sql/LOCK_grant | 52947 |
| 2641527 | 2280 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 51516 |
| 2641527 | 2281 | wait/synch/mutex/sql/THD::LOCK_query_plan | 51516 |
| 2641527 | 2282 | wait/io/socket/sql/client_connection | 8321265 |
| 2641527 | 2283 | wait/synch/mutex/sql/THD::LOCK_thd_query | 65826 |
| 2641527 | 2274 | wait/synch/mutex/sql/THD::LOCK_thd_data | 128790 |
| 2641527 | 2275 | wait/synch/mutex/sql/THD::LOCK_thd_query | 47223 |
| 2641527 | 2276 | wait/synch/mutex/sql/LOCK_plugin | 78705 |
| 2641527 | 2277 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 445041 |
| 2641527 | 2278 | wait/synch/mutex/sql/THD::LOCK_query_plan | 51516 |
| 2641653 | 3592 | wait/synch/mutex/sql/THD::LOCK_thd_query | 88722 |
| 2641653 | 3583 | wait/synch/mutex/sql/THD::LOCK_thd_data | 153117 |
| 2641653 | 3584 | wait/synch/mutex/sql/THD::LOCK_thd_query | 44361 |
| 2641653 | 3585 | wait/synch/mutex/sql/LOCK_plugin | 68688 |
| 2641653 | 3586 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 160272 |
| 2641653 | 3587 | wait/synch/mutex/sql/THD::LOCK_query_plan | 45792 |
| 2641653 | 3588 | wait/synch/rwlock/sql/LOCK_grant | 58671 |
| 2641653 | 3589 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 38637 |
| 2641653 | 3590 | wait/synch/mutex/sql/THD::LOCK_query_plan | 50085 |
| 2641653 | 3591 | wait/io/socket/sql/client_connection | 11134611 |
| 2641654 | 27862 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 173151 |
| 2641654 | 27863 | wait/synch/mutex/sql/THD::LOCK_query_plan | 40068 |
| 2641654 | 27864 | wait/synch/rwlock/sql/LOCK_grant | 55809 |
| 2641654 | 27865 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 87291 |
| 2641654 | 27866 | wait/synch/mutex/sql/THD::LOCK_query_plan | 75843 |
| 2641654 | 27867 | wait/io/socket/sql/client_connection | 11873007 |
| 2641654 | 27868 | wait/synch/mutex/sql/THD::LOCK_thd_query | 61533 |
| 2641654 | 27859 | wait/synch/mutex/sql/THD::LOCK_thd_data | 78705 |
| 2641654 | 27860 | wait/synch/mutex/sql/THD::LOCK_thd_query | 35775 |
| 2641654 | 27861 | wait/synch/mutex/sql/LOCK_plugin | 60102 |
| 2641688 | 10185 | wait/synch/mutex/sql/THD::LOCK_query_plan | 40068 |
| 2641688 | 10186 | wait/io/socket/sql/client_connection | 7651557 |
| 2641688 | 10187 | wait/synch/mutex/sql/THD::LOCK_thd_query | 74412 |
| 2641688 | 10178 | wait/synch/mutex/sql/THD::LOCK_thd_data | 211788 |
| 2641688 | 10179 | wait/synch/mutex/sql/THD::LOCK_thd_query | 31482 |
| 2641688 | 10180 | wait/synch/mutex/sql/LOCK_plugin | 41499 |
| 2641688 | 10181 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 168858 |
| 2641688 | 10182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 70119 |
| 2641688 | 10183 | wait/synch/rwlock/sql/LOCK_grant | 47223 |
| 2641688 | 10184 | wait/synch/mutex/sql/THD::LOCK_thd_sysvar | 45792 |
| 2642025 | 383 | wait/synch/mutex/sql/THD::LOCK_thd_data | 130221 |
| 2642025 | 384 | wait/synch/mutex/sql/THD::LOCK_thd_query | 58671 |
| 2642025 | 385 | wait/synch/mutex/sql/THD::LOCK_query_plan | 93015 |
| 2642025 | 386 | wait/synch/rwlock/sql/LOCK_grant | 253287 |
| 2642025 | 387 | wait/synch/mutex/sql/LOCK_table_cache | 145962 |
| 2642025 | 388 | wait/synch/mutex/sql/THD::LOCK_thd_data | 134514 |
| 2642025 | 389 | wait/synch/mutex/mysys/THR_LOCK::mutex | 137376 |
| 2642025 | 390 | wait/synch/mutex/sql/THD::LOCK_query_plan | 47223 |
| 2642025 | 391 | wait/synch/mutex/sql/THD::LOCK_query_plan | 68688 |
| 2642025 | 382 | wait/io/socket/sql/client_connection | 2218050 |
| 2642174 | 29946 | wait/synch/mutex/sql/THD::LOCK_thd_data | 383508 |
| 2642174 | 29947 | wait/synch/mutex/sql/LOCK_table_cache | 154548 |
| 2642174 | 29948 | wait/synch/mutex/sql/THD::LOCK_query_plan | 118773 |
| 2642174 | 29949 | wait/io/socket/sql/client_connection | 19666233 |
| 2642174 | 29950 | wait/synch/mutex/sql/THD::LOCK_thd_query | 13431366 |
| 2642174 | 29941 | wait/synch/mutex/innodb/autoinc_mutex | 41499 |
| 2642174 | 29942 | wait/synch/mutex/innodb/trx_mutex | 198909 |
| 2642174 | 29943 | wait/synch/mutex/innodb/trx_mutex | 38637 |
| 2642174 | 29944 | wait/synch/mutex/innodb/srv_dict_tmpfile_mutex | 34344 |
| 2642174 | 29945 | wait/synch/mutex/innodb/dict_sys_mutex | 62964 |
| 2642179 | 1266 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2642179 | 1267 | wait/synch/mutex/mysys/BITMAP::mutex | 70119 |
| 2642179 | 1268 | wait/io/socket/sql/client_connection | 17267877 |
| 2642179 | 1269 | wait/synch/mutex/sql/THD::LOCK_thd_query | 64395 |
| 2642179 | 1260 | wait/synch/sxlock/innodb/hash_table_locks | 48654 |
| 2642179 | 1261 | wait/synch/mutex/innodb/log_sys_mutex | 41499 |
| 2642179 | 1262 | wait/synch/mutex/innodb/rw_lock_list_mutex | 51516 |
| 2642179 | 1263 | wait/synch/mutex/innodb/rw_lock_list_mutex | 41499 |
| 2642179 | 1264 | wait/synch/mutex/innodb/trx_sys_mutex | 38637 |
| 2642179 | 1265 | wait/synch/mutex/innodb/trx_pool_mutex | 35775 |
| 2642184 | 641 | wait/synch/mutex/innodb/rw_lock_list_mutex | 30051 |
| 2642184 | 642 | wait/synch/mutex/innodb/trx_sys_mutex | 31482 |
| 2642184 | 643 | wait/synch/mutex/innodb/trx_pool_mutex | 42930 |
| 2642184 | 644 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2642184 | 645 | wait/synch/mutex/mysys/BITMAP::mutex | 78705 |
| 2642184 | 646 | wait/io/socket/sql/client_connection | 16933023 |
| 2642184 | 647 | wait/synch/mutex/sql/THD::LOCK_thd_query | 174582 |
| 2642184 | 638 | wait/synch/sxlock/innodb/hash_table_locks | 48654 |
| 2642184 | 639 | wait/synch/mutex/innodb/log_sys_mutex | 32913 |
| 2642184 | 640 | wait/synch/mutex/innodb/rw_lock_list_mutex | 34344 |
| 2642185 | 144 | wait/synch/mutex/innodb/rw_lock_list_mutex | 70119 |
| 2642185 | 145 | wait/synch/mutex/innodb/rw_lock_list_mutex | 31482 |
| 2642185 | 146 | wait/synch/mutex/innodb/trx_sys_mutex | 48654 |
| 2642185 | 147 | wait/synch/mutex/innodb/trx_pool_mutex | 37206 |
| 2642185 | 148 | wait/synch/mutex/innodb/trx_mutex | 37206 |
| 2642185 | 149 | wait/synch/mutex/mysys/BITMAP::mutex | 77274 |
| 2642185 | 150 | wait/io/socket/sql/client_connection | 17864604 |
| 2642185 | 151 | wait/synch/mutex/sql/THD::LOCK_thd_query | 110187 |
| 2642185 | 142 | wait/synch/sxlock/innodb/hash_table_locks | 50085 |
| 2642185 | 143 | wait/synch/mutex/innodb/log_sys_mutex | 52947 |
| 2642286 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 52947 |
| 2642286 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 44361 |
| 2642286 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 42930 |
| 2642286 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 48654 |
| 2642286 | 183 | wait/io/socket/sql/client_connection | 14777937 |
| 2642286 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 70119 |
| 2642286 | 175 | wait/synch/mutex/sql/LOCK_plugin | 103032 |
| 2642286 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 124497 |
| 2642286 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 78705 |
| 2642286 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 52947 |
| 2642287 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 48654 |
| 2642287 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 42930 |
| 2642287 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 44361 |
| 2642287 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 50085 |
| 2642287 | 183 | wait/io/socket/sql/client_connection | 13077909 |
| 2642287 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 140238 |
| 2642287 | 175 | wait/synch/mutex/sql/LOCK_plugin | 124497 |
| 2642287 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 141669 |
| 2642287 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 60102 |
| 2642287 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 48654 |
| 2642288 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 55809 |
| 2642288 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 34344 |
| 2642288 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 40068 |
| 2642288 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 50085 |
| 2642288 | 183 | wait/io/socket/sql/client_connection | 12868983 |
| 2642288 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 148824 |
| 2642288 | 175 | wait/synch/mutex/sql/LOCK_plugin | 75843 |
| 2642288 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 148824 |
| 2642288 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 57240 |
| 2642288 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 64395 |
| 2642289 | 189 | wait/io/socket/sql/client_connection | 13810581 |
| 2642289 | 190 | wait/synch/mutex/sql/THD::LOCK_thd_query | 82998 |
| 2642289 | 181 | wait/synch/mutex/sql/LOCK_plugin | 58671 |
| 2642289 | 182 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 124497 |
| 2642289 | 183 | wait/synch/mutex/sql/THD::LOCK_query_plan | 58671 |
| 2642289 | 184 | wait/synch/mutex/sql/LOCK_global_system_variables | 60102 |
| 2642289 | 185 | wait/synch/mutex/sql/THD::LOCK_query_plan | 58671 |
| 2642289 | 186 | wait/synch/mutex/sql/THD::LOCK_query_plan | 35775 |
| 2642289 | 187 | wait/synch/mutex/sql/LOCK_global_system_variables | 42930 |
| 2642289 | 188 | wait/synch/mutex/sql/THD::LOCK_query_plan | 50085 |
| 2642290 | 231 | wait/synch/mutex/sql/THD::LOCK_thd_query | 68688 |
| 2642290 | 232 | wait/synch/mutex/sql/THD::LOCK_query_plan | 101601 |
| 2642290 | 233 | wait/synch/mutex/sql/THD::LOCK_query_plan | 61533 |
| 2642290 | 234 | wait/synch/mutex/sql/THD::LOCK_query_plan | 44361 |
| 2642290 | 235 | wait/synch/mutex/sql/THD::LOCK_query_plan | 38637 |
| 2642290 | 236 | wait/io/socket/sql/client_connection | 17202051 |
| 2642290 | 237 | wait/synch/mutex/sql/THD::LOCK_thd_query | 95877 |
| 2642290 | 227 | idle | 16826172000000 |
| 2642290 | 229 | wait/io/socket/sql/client_connection | 1257849 |
| 2642290 | 230 | wait/synch/mutex/sql/THD::LOCK_thd_data | 247563 |
| 2642303 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 54378 |
| 2642303 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 45792 |
| 2642303 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 41499 |
| 2642303 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 48654 |
| 2642303 | 183 | wait/io/socket/sql/client_connection | 8623206 |
| 2642303 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 115911 |
| 2642303 | 175 | wait/synch/mutex/sql/LOCK_plugin | 143100 |
| 2642303 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 228960 |
| 2642303 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 70119 |
| 2642303 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 60102 |
| 2642304 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 48654 |
| 2642304 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 34344 |
| 2642304 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 44361 |
| 2642304 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 31482 |
| 2642304 | 183 | wait/io/socket/sql/client_connection | 12547008 |
| 2642304 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 68688 |
| 2642304 | 175 | wait/synch/mutex/sql/LOCK_plugin | 131652 |
| 2642304 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 131652 |
| 2642304 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 80136 |
| 2642304 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 57240 |
| 2642305 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 50085 |
| 2642305 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 32913 |
| 2642305 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 44361 |
| 2642305 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 32913 |
| 2642305 | 183 | wait/io/socket/sql/client_connection | 8422866 |
| 2642305 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 60102 |
| 2642305 | 175 | wait/synch/mutex/sql/LOCK_plugin | 124497 |
| 2642305 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 137376 |
| 2642305 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 87291 |
| 2642305 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 45792 |
| 2642306 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 48654 |
| 2642306 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 35775 |
| 2642306 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 45792 |
| 2642306 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 32913 |
| 2642306 | 183 | wait/io/socket/sql/client_connection | 8314110 |
| 2642306 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 52947 |
| 2642306 | 175 | wait/synch/mutex/sql/LOCK_plugin | 141669 |
| 2642306 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 183168 |
| 2642306 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 80136 |
| 2642306 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 67257 |
| 2642307 | 189 | wait/io/socket/sql/client_connection | 8325558 |
| 2642307 | 190 | wait/synch/mutex/sql/THD::LOCK_thd_query | 62964 |
| 2642307 | 181 | wait/synch/mutex/sql/LOCK_plugin | 105894 |
| 2642307 | 182 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 323406 |
| 2642307 | 183 | wait/synch/mutex/sql/THD::LOCK_query_plan | 64395 |
| 2642307 | 184 | wait/synch/mutex/sql/LOCK_global_system_variables | 58671 |
| 2642307 | 185 | wait/synch/mutex/sql/THD::LOCK_query_plan | 38637 |
| 2642307 | 186 | wait/synch/mutex/sql/THD::LOCK_query_plan | 32913 |
| 2642307 | 187 | wait/synch/mutex/sql/LOCK_global_system_variables | 45792 |
| 2642307 | 188 | wait/synch/mutex/sql/THD::LOCK_query_plan | 50085 |
| 2642356 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 50085 |
| 2642356 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 34344 |
| 2642356 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 64395 |
| 2642356 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 32913 |
| 2642356 | 183 | wait/io/socket/sql/client_connection | 9964053 |
| 2642356 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 71550 |
| 2642356 | 175 | wait/synch/mutex/sql/LOCK_plugin | 64395 |
| 2642356 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 218943 |
| 2642356 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 51516 |
| 2642356 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 64395 |
| 2642357 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 42930 |
| 2642357 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 42930 |
| 2642357 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 42930 |
| 2642357 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 34344 |
| 2642357 | 183 | wait/io/socket/sql/client_connection | 8930871 |
| 2642357 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 80136 |
| 2642357 | 175 | wait/synch/mutex/sql/LOCK_plugin | 68688 |
| 2642357 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 107325 |
| 2642357 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 64395 |
| 2642357 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 57240 |
| 2642358 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 40068 |
| 2642358 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 34344 |
| 2642358 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 44361 |
| 2642358 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 55809 |
| 2642358 | 183 | wait/io/socket/sql/client_connection | 8627499 |
| 2642358 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 75843 |
| 2642358 | 175 | wait/synch/mutex/sql/LOCK_plugin | 125928 |
| 2642358 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 130221 |
| 2642358 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 74412 |
| 2642358 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 55809 |
| 2642359 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 37206 |
| 2642359 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 32913 |
| 2642359 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 45792 |
| 2642359 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 31482 |
| 2642359 | 183 | wait/io/socket/sql/client_connection | 8975232 |
| 2642359 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 80136 |
| 2642359 | 175 | wait/synch/mutex/sql/LOCK_plugin | 141669 |
| 2642359 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 130221 |
| 2642359 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 121635 |
| 2642359 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 64395 |
| 2642360 | 4160 | wait/synch/mutex/sql/THD::LOCK_thd_query | 123066 |
| 2642360 | 4151 | wait/synch/mutex/innodb/trx_mutex | 30051 |
| 2642360 | 4152 | wait/synch/mutex/sql/THD::LOCK_query_plan | 70119 |
| 2642360 | 4153 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2642360 | 4154 | wait/synch/mutex/innodb/trx_mutex | 31482 |
| 2642360 | 4155 | wait/synch/mutex/sql/THD::LOCK_thd_data | 61533 |
| 2642360 | 4156 | wait/synch/mutex/sql/LOCK_table_cache | 41499 |
| 2642360 | 4157 | wait/synch/mutex/sql/THD::LOCK_thd_data | 42930 |
| 2642360 | 4158 | wait/synch/mutex/sql/LOCK_table_cache | 32913 |
| 2642360 | 4159 | wait/io/socket/sql/client_connection | 15796809 |
| 2642381 | 179 | wait/synch/mutex/sql/THD::LOCK_query_plan | 42930 |
| 2642381 | 180 | wait/synch/mutex/sql/THD::LOCK_query_plan | 42930 |
| 2642381 | 181 | wait/synch/mutex/sql/LOCK_global_system_variables | 44361 |
| 2642381 | 182 | wait/synch/mutex/sql/THD::LOCK_query_plan | 31482 |
| 2642381 | 183 | wait/io/socket/sql/client_connection | 8689032 |
| 2642381 | 184 | wait/synch/mutex/sql/THD::LOCK_thd_query | 104463 |
| 2642381 | 175 | wait/synch/mutex/sql/LOCK_plugin | 91584 |
| 2642381 | 176 | wait/synch/rwlock/sql/LOCK_system_variables_hash | 226098 |
| 2642381 | 177 | wait/synch/mutex/sql/THD::LOCK_query_plan | 50085 |
| 2642381 | 178 | wait/synch/mutex/sql/LOCK_global_system_variables | 58671 |
+-----------+----------+-----------------------------------------------------+----------------+
475 rows in set (0.00 sec)
instance表記錄了哪些類型的對象會被檢測。這些對象在被server使用時，在該表中將會產生一條事件記錄，例如，file_instances表列出了文件I/O操作及其關聯文件名：
root@[performance_schema]> select * from file_instances order by open_count desc limit 20;
+--------------------------------------------------+--------------------------------------+------------+
| FILE_NAME | EVENT_NAME | OPEN_COUNT |
+--------------------------------------------------+--------------------------------------+------------+
| /opt/mysql/3306/uni/#sql-54f4_1d5e29.ibd | wait/io/file/innodb/innodb_data_file | 10 |
| /opt/mysql/3306/mysql/proc.MYD | wait/io/file/myisam/dfile | 9 |
| /opt/mysql/3306/uni/uni_daily_extra_sales.ibd | wait/io/file/innodb/innodb_data_file | 9 |
| /opt/mysql/3306/uni/uni_daily_refund.ibd | wait/io/file/innodb/innodb_data_file | 7 |
| /opt/mysql/3306/uni/uni_passenger_tel.ibd | wait/io/file/innodb/innodb_data_file | 6 |
| /opt/mysql/3306/uni/uni_flt_fare_policy_indv.ibd | wait/io/file/innodb/innodb_data_file | 5 |
| /opt/mysql/3306/uni/uni_new_mts_meal_policy.ibd | wait/io/file/innodb/innodb_data_file | 5 |
| /opt/mysql/3306/uni/uni_offer_item.ibd | wait/io/file/innodb/innodb_data_file | 5 |
| /opt/mysql/3306/uni/uni_test_rep_test.ibd | wait/io/file/innodb/innodb_data_file | 5 |
| /opt/mysql/3306/uni/uni_daily_extra_refund.ibd | wait/io/file/innodb/innodb_data_file | 5 |
| /opt/mysql/3306/uni/uni_daily_sales.ibd | wait/io/file/innodb/innodb_data_file | 4 |
| /opt/mysql/3306/uni/uni_flt_product.ibd | wait/io/file/innodb/innodb_data_file | 4 |
| /opt/mysql/3306/uni/uni_flt_rule_policy.ibd | wait/io/file/innodb/innodb_data_file | 4 |
| /opt/mysql/3306/uni/w_tab_cnt.ibd | wait/io/file/innodb/innodb_data_file | 4 |
| /opt/mysql/3306/uni/uni_payment_pay.ibd | wait/io/file/innodb/innodb_data_file | 4 |
| /opt/mysql/3306/uni/uni_test_rep.ibd | wait/io/file/innodb/innodb_data_file | 4 |
| /opt/mysql/3306/uni/uni_seller_channel.ibd | wait/io/file/innodb/innodb_data_file | 4 |
| /opt/mysql/3306/apollo/ap_product.ibd | wait/io/file/innodb/innodb_data_file | 4 |
| /opt/mysql/3306/apollo/ap_tax.ibd | wait/io/file/innodb/innodb_data_file | 4 |
| /opt/mysql/3306/apollo/ap_fuel_tax.ibd | wait/io/file/innodb/innodb_data_file | 4 |
+--------------------------------------------------+--------------------------------------+------------+
20 rows in set (0.00 sec)
我們大多數時候并不會直接使用performance_schema來查詢性能數據，而是使用sys schema下的視圖代替，為什么不直接學習sys schema呢?那你知道sys schema中的數據是從哪里吐出來的嗎?performance_schema 中的數據實際上主要是從performance_schema、information_schema中獲取，所以要想玩轉sys schema，全面了解performance_schema必不可少。
http://www.sohu.com/a/231745627_610509
http://www.sohu.com/a/253338003_610509
https://www.sohu.com/a/253337581_610509
http://www.sohu.com/a/253337781_610509
https://blog.csdn.net/woqutechteam/article/details/80452101
https://blog.csdn.net/woqutechteam/article/details/80707684
https://blog.csdn.net/n88Lpo/article/details/82700908
https://blog.csdn.net/n88Lpo/article/details/82700904
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