1. 技术文章
  2. MySQL5.6 PERFORMANCE_SCHEMA 说明

MySQL5.6 PERFORMANCE_SCHEMA 说明

由 陌路散爱 提交于 2019-12-01 05:08:56

背景：

      MySQL 5.5开始新增一个数据库：PERFORMANCE_SCHEMA，主要用于收集数据库服务器性能参数。并且库里表的存储引擎均为PERFORMANCE_SCHEMA，而用户是不能创建存储引擎为PERFORMANCE_SCHEMA的表。MySQL5.5默认是关闭的，需要手动开启，在配置文件里添加：

view sourceprint?
1.[mysqld]
2.performance_schema=ON

查看是否开启：

view sourceprint?
1.mysql>show variables like 'performance_schema';
2.+--------------------+-------+
3.| Variable_name      | Value |
4.+--------------------+-------+
5.| performance_schema | <strong>ON</strong>    |
6.+--------------------+-------+

从MySQL5.6开始，默认打开，本文就从MySQL5.6来说明，在数据库使用当中PERFORMANCE_SCHEMA的一些比较常用的功能。具体的信息可以查看官方文档。

相关表信息：

一：配置（setup）表：

view sourceprint?
01.zjy@performance_schema 10:16:56>show tables like '%setup%';
02.+----------------------------------------+
03.| Tables_in_performance_schema (%setup%) |
04.+----------------------------------------+
05.| setup_actors                           |
06.| setup_consumers                        |
07.| setup_instruments                      |
08.| setup_objects                          |
09.| setup_timers                           |
10.+----------------------------------------+

1，setup_actors：配置用户纬度的监控，默认监控所有用户。

view sourceprint?
1.zjy@performance_schema 10:19:11>select * from setup_actors;
2.+------+------+------+
3.| HOST | USER | ROLE |
4.+------+------+------+
5.| %    | %    | %    |
6.+------+------+------+

2，setup_consumers：配置events的消费者类型，即收集的events写入到哪些统计表中。

view sourceprint?
01.zjy@: performance_schema 10:23:35>select * from setup_consumers;
02.+--------------------------------+---------+
03.| NAME                           | ENABLED |
04.+--------------------------------+---------+
05.| events_stages_current          | NO      |
06.| events_stages_history          | NO      |
07.| events_stages_history_long     | NO      |
08.| events_statements_current      | YES     |
09.| events_statements_history      | NO      |
10.| events_statements_history_long | NO      |
11.| events_waits_current           | NO      |
12.| events_waits_history           | NO      |
13.| events_waits_history_long      | NO      |
14.| global_instrumentation         | YES     |
15.| thread_instrumentation         | YES     |
16.| statements_digest              | YES     |
17.+--------------------------------+---------+

这里需要说明的是需要查看哪个就更新其ENABLED列为YES。如：

view sourceprint?
1.zjy@performance_schema 10:25:02>update setup_consumers set ENABLED='YES' where NAME in ('events_stages_current','events_waits_current');
2.Query OK, 2 rows affected (0.00 sec)

更新完后立即生效，但是服务器重启之后又会变回默认值，要永久生效需要在配置文件里添加：

view sourceprint?
1.[mysqld]
2.#performance_schema
3.performance_schema_consumer_events_waits_current=on
4.performance_schema_consumer_events_stages_current=on
5.performance_schema_consumer_events_statements_current=on
6.performance_schema_consumer_events_waits_history=on
7.performance_schema_consumer_events_stages_history=on
8.performance_schema_consumer_events_statements_history=on

即在这些表的前面加上：performance_schema_consumer_xxx。表setup_consumers里面的值有个层级关系：

view sourceprint?
1.<strong>global_instrumentation</strong> > <strong>thread_instrumentation</strong> = <strong>statements_digest</strong> > events_stages_<strong>current</strong> = events_statements_current = events_waits_current > events_stages_<strong>history</strong> = events_statements_history = events_waits_history > events_stages_<strong>history_long</strong> = events_statements_history_long = events_waits_history_long

只有上一层次的为YES，才会继续检查该本层为YES or NO。global_instrumentation是最高级别consumer，如果它设置为NO，则所有的consumer都会忽略。其中history和history_long存的是current表的历史记录条数，history表记录了每个线程最近等待的10个事件，而history_long表则记录了最近所有线程产生的10000个事件，这里的10和10000都是可以配置的。这三个表表结构相同，history和history_long表数据都来源于current表。长度通过控制参数：

view sourceprint?
01.zjy@performance_schema 11:10:03>show variables like 'performance_schema%history%size';
02.+--------------------------------------------------------+-------+
03.| Variable_name                                          | Value |
04.+--------------------------------------------------------+-------+
05.| performance_schema_events_stages_history_long_size     | 10000 |
06.| performance_schema_events_stages_history_size          | 10    |
07.| performance_schema_events_statements_history_long_size | 10000 |
08.| performance_schema_events_statements_history_size      | 10    |
09.| performance_schema_events_waits_history_long_size      | 10000 |
10.| performance_schema_events_waits_history_size           | 10    |
11.+--------------------------------------------------------+-------+

3，setup_instruments：配置具体的instrument，主要包含4大类：idle、stage/xxx、statement/xxx、wait/xxx：

view sourceprint?
01.zjy@performance_schema 10:56:35>select name,count(*) from setup_instruments group by LEFT(name,5);
02.+---------------------------------+----------+
03.| name                            | count(*) |
04.+---------------------------------+----------+
05.| idle                            |        1 |
06.| stage/sql/After create          |      111 |
07.| statement/sql/select            |      179 |
08.| wait/synch/mutex/sql/PAGE::lock |      296 |
09.+---------------------------------+----------+

idle表示socket空闲的时间，stage类表示语句的每个执行阶段的统计，statement类统计语句维度的信息，wait类统计各种等待事件，比如IO，mutux，spin_lock,condition等。

4，setup_objects：配置监控对象，默认对mysql，performance_schema和information_schema中的表都不监控，而其它DB的所有表都监控。

view sourceprint?
01.zjy@performance_schema 11:00:18>select * from setup_objects;
02.+-------------+--------------------+-------------+---------+-------+
03.| OBJECT_TYPE | OBJECT_SCHEMA      | OBJECT_NAME | ENABLED | TIMED |
04.+-------------+--------------------+-------------+---------+-------+
05.| TABLE       | mysql              | %           | NO      | NO    |
06.| TABLE       | performance_schema | %           | NO      | NO    |
07.| TABLE       | information_schema | %           | NO      | NO    |
08.| TABLE       | %                  | %           | <strong>YES</strong>     | <strong>YES</strong>   |
09.+-------------+--------------------+-------------+---------+-------+

5，setup_timers：配置每种类型指令的统计时间单位。MICROSECOND表示统计单位是微妙，CYCLE表示统计单位是时钟周期，时间度量与CPU的主频有关，NANOSECOND表示统计单位是纳秒。但无论采用哪种度量单位，最终统计表中统计的时间都会装换到皮秒。（1秒＝1000000000000皮秒）

view sourceprint?
01.zjy@performance_schema 11:05:12>select * from setup_timers;
02.+-----------+-------------+
03.| NAME      | TIMER_NAME  |
04.+-----------+-------------+
05.| idle      | MICROSECOND |
06.| wait      | CYCLE       |
07.| stage     | NANOSECOND  |
08.| statement | NANOSECOND  |
09.+-----------+-------------+

二：instance表

1，cond_instances：条件等待对象实例

表中记录了系统中使用的条件变量的对象，OBJECT_INSTANCE_BEGIN为对象的内存地址。

2，file_instances：文件实例

表中记录了系统中打开了文件的对象，包括ibdata文件，redo文件，binlog文件，用户的表文件等，open_count显示当前文件打开的数目，如果重来没有打开过，不会出现在表中。

view sourceprint?
01.zjy@performance_schema 11:20:04>select * from file_instances limit 2,5;
02.+---------------------------------+--------------------------------------+------------+
03.| FILE_NAME                       | EVENT_NAME                           | <strong>OPEN_COUNT</strong> |
04.+---------------------------------+--------------------------------------+------------+
05.| /var/lib/mysql/mysql/plugin.frm | wait/io/file/sql/FRM                 |          0 |
06.| /var/lib/mysql/mysql/plugin.MYI | wait/io/file/myisam/kfile            |          1 |
07.| /var/lib/mysql/mysql/plugin.MYD | wait/io/file/myisam/dfile            |          1 |
08.| /var/lib/mysql/ibdata1          | wait/io/file/innodb/innodb_data_file |          2 |
09.| /var/lib/mysql/ib_logfile0      | wait/io/file/innodb/innodb_log_file  |          2 |
10.+---------------------------------+--------------------------------------+------------+

3，mutex_instances：互斥同步对象实例

表中记录了系统中使用互斥量对象的所有记录，其中name为：wait/synch/mutex/*。LOCKED_BY_THREAD_ID显示哪个线程正持有mutex，若没有线程持有，则为NULL。

4，rwlock_instances： 读写锁同步对象实例

表中记录了系统中使用读写锁对象的所有记录，其中name为 wait/synch/rwlock/*。WRITE_LOCKED_BY_THREAD_ID为正在持有该对象的thread_id，若没有线程持有，则为NULL。READ_LOCKED_BY_COUNT为记录了同时有多少个读者持有读锁。（通过 events_waits_current 表可以知道，哪个线程在等待锁；通过rwlock_instances知道哪个线程持有锁。rwlock_instances的缺陷是，只能记录持有写锁的线程，对于读锁则无能为力）。

5，socket_instances：活跃会话对象实例
表中记录了thread_id,socket_id,ip和port，其它表可以通过thread_id与socket_instance进行关联，获取IP-PORT信息，能够与应用对接起来。
event_name主要包含3类：
wait/io/socket/sql/server_unix_socket，服务端unix监听socket
wait/io/socket/sql/server_tcpip_socket，服务端tcp监听socket
wait/io/socket/sql/client_connection，客户端socket

三：Wait表

1，events_waits_current：记录了当前线程等待的事件

2，events_waits_history：记录了每个线程最近等待的10个事件

3，events_waits_history_long：记录了最近所有线程产生的10000个事件

表结构定义如下：

view sourceprint?
01.CREATE TABLE `events_waits_current` (
02.`THREAD_ID` bigint(20) unsigned NOT NULL COMMENT '线程ID',
03.`EVENT_ID` bigint(20) unsigned NOT NULL COMMENT '当前线程的事件ID，和THREAD_ID确定唯一',
04.`END_EVENT_ID` bigint(20) unsigned DEFAULT NULL COMMENT '当事件开始时，这一列被设置为NULL。当事件结束时，再更新为当前的事件ID',
05.`EVENT_NAME` varchar(128) NOT NULL COMMENT '事件名称',
06.`SOURCE` varchar(64) DEFAULT NULL COMMENT '该事件产生时的源码文件',
07.`TIMER_START` bigint(20) unsigned DEFAULT NULL COMMENT '事件开始时间（皮秒）',
08.`TIMER_END` bigint(20) unsigned DEFAULT NULL COMMENT '事件结束结束时间（皮秒）',
09.`TIMER_WAIT` bigint(20) unsigned DEFAULT NULL COMMENT '事件等待时间（皮秒）',
10.`SPINS` int(10) unsigned DEFAULT NULL COMMENT '',
11.`OBJECT_SCHEMA` varchar(64) DEFAULT NULL COMMENT '库名',
12.`OBJECT_NAME` varchar(512) DEFAULT NULL COMMENT '文件名、表名、IP:SOCK值',
13.`OBJECT_TYPE` varchar(64) DEFAULT NULL COMMENT 'FILE、TABLE、TEMPORARY TABLE',
14.`INDEX_NAME` varchar(64) DEFAULT NULL COMMENT '索引名',
15.`OBJECT_INSTANCE_BEGIN` bigint(20) unsigned NOT NULL COMMENT '内存地址',
16.`NESTING_EVENT_ID` bigint(20) unsigned DEFAULT NULL COMMENT '该事件对应的父事件ID',
17.`NESTING_EVENT_TYPE` enum('STATEMENT','STAGE','WAIT') DEFAULT NULL COMMENT '父事件类型(STATEMENT, STAGE, WAIT)',
18.`OPERATION` varchar(32) NOT NULL COMMENT '操作类型（lock, read, write）',
19.`NUMBER_OF_BYTES` bigint(20) DEFAULT NULL COMMENT '',
20.`FLAGS` int(10) unsigned DEFAULT NULL COMMENT '标记'
21.) ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8

四：Stage 表 

1，events_stages_current：记录了当前线程所处的执行阶段

2，events_stages_history：记录了当前线程所处的执行阶段10条历史记录

3，events_stages_history_long：记录了当前线程所处的执行阶段10000条历史记录

表结构定义如下：

view sourceprint?
01.CREATE TABLE `events_stages_current` (
02.`THREAD_ID` bigint(20) unsigned NOT NULL COMMENT '线程ID',
03.`EVENT_ID` bigint(20) unsigned NOT NULL COMMENT '事件ID',
04.`END_EVENT_ID` bigint(20) unsigned DEFAULT NULL COMMENT '结束事件ID',
05.`EVENT_NAME` varchar(128) NOT NULL COMMENT '事件名称',
06.`SOURCE` varchar(64) DEFAULT NULL COMMENT '源码位置',
07.`TIMER_START` bigint(20) unsigned DEFAULT NULL COMMENT '事件开始时间（皮秒）',
08.`TIMER_END` bigint(20) unsigned DEFAULT NULL COMMENT '事件结束结束时间（皮秒）',
09.`TIMER_WAIT` bigint(20) unsigned DEFAULT NULL COMMENT '事件等待时间（皮秒）',
10.`NESTING_EVENT_ID` bigint(20) unsigned DEFAULT NULL COMMENT '该事件对应的父事件ID',
11.`NESTING_EVENT_TYPE` enum('STATEMENT','STAGE','WAIT') DEFAULT NULL COMMENT '父事件类型(STATEMENT, STAGE, WAIT)'
12.) ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8

五：Statement 表

1，events_statements_current：通过 thread_id+event_id可以唯一确定一条记录。Statments表只记录最顶层的请求，SQL语句或是COMMAND，每条语句一行。event_name形式为statement/sql/*，或statement/com/*

2，events_statements_history

3，events_statements_history_long

表结构定义如下：

view sourceprint?
01.CREATE TABLE `events_statements_current` (
02.`THREAD_ID` bigint(20) unsigned NOT NULL COMMENT '线程ID',
03.`EVENT_ID` bigint(20) unsigned NOT NULL COMMENT '事件ID',
04.`END_EVENT_ID` bigint(20) unsigned DEFAULT NULL COMMENT '结束事件ID',
05.`EVENT_NAME` varchar(128) NOT NULL COMMENT '事件名称',
06.`SOURCE` varchar(64) DEFAULT NULL COMMENT '源码位置',
07.`TIMER_START` bigint(20) unsigned DEFAULT NULL COMMENT '事件开始时间（皮秒）',
08.`TIMER_END` bigint(20) unsigned DEFAULT NULL COMMENT '事件结束结束时间（皮秒）',
09.`TIMER_WAIT` bigint(20) unsigned DEFAULT NULL COMMENT '事件等待时间（皮秒）',
10.`LOCK_TIME` bigint(20) unsigned NOT NULL COMMENT '锁时间',
11.`SQL_TEXT` longtext COMMENT '记录SQL语句',
12.`DIGEST` varchar(32) DEFAULT NULL COMMENT '对SQL_TEXT做MD5产生的32位字符串',
13.`DIGEST_TEXT` longtext COMMENT '将语句中值部分用问号代替，用于SQL语句归类',
14.`CURRENT_SCHEMA` varchar(64) DEFAULT NULL COMMENT '默认的数据库名',
15.`OBJECT_TYPE` varchar(64) DEFAULT NULL COMMENT '保留字段',
16.`OBJECT_SCHEMA` varchar(64) DEFAULT NULL COMMENT '保留字段',
17.`OBJECT_NAME` varchar(64) DEFAULT NULL COMMENT '保留字段',
18.`OBJECT_INSTANCE_BEGIN` bigint(20) unsigned DEFAULT NULL COMMENT '内存地址',
19.`MYSQL_ERRNO` int(11) DEFAULT NULL COMMENT '',
20.`RETURNED_SQLSTATE` varchar(5) DEFAULT NULL COMMENT '',
21.`MESSAGE_TEXT` varchar(128) DEFAULT NULL COMMENT '信息',
22.`ERRORS` bigint(20) unsigned NOT NULL COMMENT '错误数目',
23.`WARNINGS` bigint(20) unsigned NOT NULL COMMENT '警告数目',
24.`ROWS_AFFECTED` bigint(20) unsigned NOT NULL COMMENT '影响的数目',
25.`ROWS_SENT` bigint(20) unsigned NOT NULL COMMENT '返回的记录数',
26.`ROWS_EXAMINED` bigint(20) unsigned NOT NULL COMMENT '读取扫描的记录数目',
27.`CREATED_TMP_DISK_TABLES` bigint(20) unsigned NOT NULL COMMENT '创建磁盘临时表数目',
28.`CREATED_TMP_TABLES` bigint(20) unsigned NOT NULL COMMENT '创建临时表数目',
29.`SELECT_FULL_JOIN` bigint(20) unsigned NOT NULL COMMENT 'join时，第一个表为全表扫描的数目',
30.`SELECT_FULL_RANGE_JOIN` bigint(20) unsigned NOT NULL COMMENT '引用表采用range方式扫描的数目',
31.`SELECT_RANGE` bigint(20) unsigned NOT NULL COMMENT 'join时，第一个表采用range方式扫描的数目',
32.`SELECT_RANGE_CHECK` bigint(20) unsigned NOT NULL COMMENT '',
33.`SELECT_SCAN` bigint(20) unsigned NOT NULL COMMENT 'join时，第一个表位全表扫描的数目',
34.`SORT_MERGE_PASSES` bigint(20) unsigned NOT NULL COMMENT '',
35.`SORT_RANGE` bigint(20) unsigned NOT NULL COMMENT '范围排序数目',
36.`SORT_ROWS` bigint(20) unsigned NOT NULL COMMENT '排序的记录数目',
37.`SORT_SCAN` bigint(20) unsigned NOT NULL COMMENT '全表排序数目',
38.`NO_INDEX_USED` bigint(20) unsigned NOT NULL COMMENT '没有使用索引数目',
39.`NO_GOOD_INDEX_USED` bigint(20) unsigned NOT NULL COMMENT '',
40.`NESTING_EVENT_ID` bigint(20) unsigned DEFAULT NULL COMMENT '该事件对应的父事件ID',
41.`NESTING_EVENT_TYPE` enum('STATEMENT','STAGE','WAIT') DEFAULT NULL COMMENT '父事件类型(STATEMENT, STAGE, WAIT)'
42.) ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8

六：Connection 表

1，users：记录用户连接数信息

2，hosts：记录了主机连接数信息

3，accounts：记录了用户主机连接数信息

view sourceprint?
01.zjy@performance_schema 12:03:27>select * from users;
02.+------------------+---------------------+-------------------+
03.| USER             | CURRENT_CONNECTIONS | TOTAL_CONNECTIONS |
04.+------------------+---------------------+-------------------+
05.| debian-sys-maint |                   0 |                36 |
06.| zjy              |                   1 |             22285 |
07.| dchat_php        |                   0 |             37864 |
08.| dxyslave         |                   2 |                 9 |
09.| nagios           |                   0 |             10770 |
10.| dchat_data       |                 140 |           2233023 |
11.| NULL             |                   0 |             15866 |
12.| dchat_api        |                 160 |           2754212 |
13.| mha_data         |                   1 |                36 |
14.| backup           |                   0 |                15 |
15.| cacti            |                   0 |              4312 |
16.| kol              |                  10 |            172414 |
17.+------------------+---------------------+-------------------+
18.12 rows in set (0.00 sec)
19. 
20.zjy@performance_schema 12:03:34>select * from hosts;
21.+-----------------+---------------------+-------------------+
22.| HOST            | CURRENT_CONNECTIONS | TOTAL_CONNECTIONS |
23.+-----------------+---------------------+-------------------+
24.| 192.168.100.218 |                 150 |           2499422 |
25.| 192.168.100.240 |                  10 |            172429 |
26.| 192.168.100.139 |                   0 |               698 |
27.| 192.168.100.21  |                   0 |                 2 |
28.| 192.168.100.220 |                 150 |           2526136 |
29.| 192.168.100.25  |                   1 |                 7 |
30.| NULL            |                   0 |             15867 |
31.| 192.168.100.241 |                   0 |             21558 |
32.| 192.168.100.191 |                   1 |                34 |
33.| localhost       |                   0 |             10807 |
34.| 192.168.100.118 |                   1 |                 2 |
35.| 192.168.100.251 |                   0 |              4312 |
36.| 192.168.100.23  |                   1 |                31 |
37.| 192.168.100.193 |                   0 |                15 |
38.+-----------------+---------------------+-------------------+
39.14 rows in set (0.01 sec)
40. 
41.zjy@performance_schema 12:05:21>select * from accounts;
42.+------------------+-----------------+---------------------+-------------------+
43.| USER             | HOST            | CURRENT_CONNECTIONS | TOTAL_CONNECTIONS |
44.+------------------+-----------------+---------------------+-------------------+
45.| cacti            | 192.168.100.251 |                   0 |              4313 |
46.| debian-sys-maint | localhost       |                   0 |                36 |
47.| backup           | 192.168.100.193 |                   0 |                15 |
48.| dchat_api        | 192.168.100.220 |                  80 |           1382585 |
49.| dchat_php        | 192.168.100.220 |                   0 |             20292 |
50.| zjy              | 192.168.100.139 |                   0 |               698 |
51.| zjy              | 192.168.100.241 |                   0 |             21558 |
52.| mha_data         | 192.168.100.191 |                   1 |                34 |
53.| dxyslave         | 192.168.100.118 |                   1 |                 2 |
54.| kol              | 192.168.100.240 |                  10 |            172431 |
55.| dxyslave         | 192.168.100.25  |                   1 |                 7 |
56.| dchat_data       | 192.168.100.218 |                  70 |           1109974 |
57.| zjy              | 192.168.100.23  |                   1 |                31 |
58.| dchat_php        | 192.168.100.218 |                   0 |             17572 |
59.| dchat_data       | 192.168.100.220 |                  70 |           1123306 |
60.| NULL             | NULL            |                   0 |             15868 |
61.| mha_data         | 192.168.100.21  |                   0 |                 2 |
62.| dchat_api        | 192.168.100.218 |                  80 |           1371918 |
63.| nagios           | localhost       |                   0 |             10771 |
64.+------------------+-----------------+---------------------+-------------------+

七：Summary 表： Summary表聚集了各个维度的统计信息包括表维度，索引维度，会话维度，语句维度和锁维度的统计信息

1，events_waits_summary_global_by_event_name：按等待事件类型聚合，每个事件一条记录

view sourceprint?
1.CREATE TABLE `events_waits_summary_global_by_event_name` (
2.`EVENT_NAME` varchar(128) NOT NULL COMMENT '事件名称',
3.`COUNT_STAR` bigint(20) unsigned NOT NULL COMMENT '事件计数',
4.`SUM_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '总的等待时间',
5.`MIN_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '最小等待时间',
6.`AVG_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '平均等待时间',
7.`MAX_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '最大等待时间'
8.) ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8

2，events_waits_summary_by_instance：按等待事件对象聚合，同一种等待事件，可能有多个实例，每个实例有不同的内存地址，因此
event_name+object_instance_begin唯一确定一条记录。

view sourceprint?
01.CREATE TABLE `events_waits_summary_by_instance` (
02.`EVENT_NAME` varchar(128) NOT NULL COMMENT '事件名称',
03.`OBJECT_INSTANCE_BEGIN` bigint(20) unsigned NOT NULL COMMENT '内存地址',
04.`COUNT_STAR` bigint(20) unsigned NOT NULL COMMENT '事件计数',
05.`SUM_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '总的等待时间',
06.`MIN_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '最小等待时间',
07.`AVG_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '平均等待时间',
08.`MAX_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '最大等待时间'
09.) ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8

3，events_waits_summary_by_thread_by_event_name：按每个线程和事件来统计，thread_id+event_name唯一确定一条记录。

view sourceprint?
01.CREATE TABLE `events_waits_summary_by_thread_by_event_name` (
02.`THREAD_ID` bigint(20) unsigned NOT NULL COMMENT '线程ID',
03.`EVENT_NAME` varchar(128) NOT NULL COMMENT '事件名称',
04.`COUNT_STAR` bigint(20) unsigned NOT NULL COMMENT '事件计数',
05.`SUM_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '总的等待时间',
06.`MIN_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '最小等待时间',
07.`AVG_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '平均等待时间',
08.`MAX_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '最大等待时间'
09.) ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8

4，events_stages_summary_global_by_event_name：按事件阶段类型聚合，每个事件一条记录，表结构同上。

5，events_stages_summary_by_thread_by_event_name：按每个线程和事件来阶段统计，表结构同上。

6，events_statements_summary_by_digest：按照事件的语句进行聚合。

view sourceprint?
01.CREATE TABLE `events_statements_summary_by_digest` (
02.`SCHEMA_NAME` varchar(64) DEFAULT NULL COMMENT '库名',
03.`DIGEST` varchar(32) DEFAULT NULL COMMENT '对SQL_TEXT做MD5产生的32位字符串。如果为consumer表中没有打开statement_digest选项，则为NULL',
04.`DIGEST_TEXT` longtext COMMENT '将语句中值部分用问号代替，用于SQL语句归类。如果为consumer表中没有打开statement_digest选项，则为NULL。',
05.`COUNT_STAR` bigint(20) unsigned NOT NULL COMMENT '事件计数',
06.`SUM_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '总的等待时间',
07.`MIN_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '最小等待时间',
08.`AVG_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '平均等待时间',
09.`MAX_TIMER_WAIT` bigint(20) unsigned NOT NULL COMMENT '最大等待时间',
10.`SUM_LOCK_TIME` bigint(20) unsigned NOT NULL COMMENT '锁时间总时长',
11.`SUM_ERRORS` bigint(20) unsigned NOT NULL COMMENT '错误数的总',
12.`SUM_WARNINGS` bigint(20) unsigned NOT NULL COMMENT '警告的总数',
13.`SUM_ROWS_AFFECTED` bigint(20) unsigned NOT NULL COMMENT '影响的总数目',
14.`SUM_ROWS_SENT` bigint(20) unsigned NOT NULL COMMENT '返回总数目',
15.`SUM_ROWS_EXAMINED` bigint(20) unsigned NOT NULL COMMENT '总的扫描的数目',
16.`SUM_CREATED_TMP_DISK_TABLES` bigint(20) unsigned NOT NULL COMMENT '创建磁盘临时表的总数目',
17.`SUM_CREATED_TMP_TABLES` bigint(20) unsigned NOT NULL COMMENT '创建临时表的总数目',
18.`SUM_SELECT_FULL_JOIN` bigint(20) unsigned NOT NULL COMMENT '第一个表全表扫描的总数目',
19.`SUM_SELECT_FULL_RANGE_JOIN` bigint(20) unsigned NOT NULL COMMENT '总的采用range方式扫描的数目',
20.`SUM_SELECT_RANGE` bigint(20) unsigned NOT NULL COMMENT '第一个表采用range方式扫描的总数目',
21.`SUM_SELECT_RANGE_CHECK` bigint(20) unsigned NOT NULL COMMENT '',
22.`SUM_SELECT_SCAN` bigint(20) unsigned NOT NULL COMMENT '第一个表位全表扫描的总数目',
23.`SUM_SORT_MERGE_PASSES` bigint(20) unsigned NOT NULL COMMENT '',
24.`SUM_SORT_RANGE` bigint(20) unsigned NOT NULL COMMENT '范围排序总数',
25.`SUM_SORT_ROWS` bigint(20) unsigned NOT NULL COMMENT '排序的记录总数目',
26.`SUM_SORT_SCAN` bigint(20) unsigned NOT NULL COMMENT '第一个表排序扫描总数目',
27.`SUM_NO_INDEX_USED` bigint(20) unsigned NOT NULL COMMENT '没有使用索引总数',
28.`SUM_NO_GOOD_INDEX_USED` bigint(20) unsigned NOT NULL COMMENT '',
29.`FIRST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '第一次执行时间',
30.`LAST_SEEN` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '最后一次执行时间'
31.) ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8

7，events_statements_summary_global_by_event_name：按照事件的语句进行聚合。表结构同上。

8，events_statements_summary_by_thread_by_event_name：按照线程和事件的语句进行聚合，表结构同上。

9，file_summary_by_instance：按事件类型统计（物理IO维度）

10，file_summary_by_event_name：具体文件统计（物理IO维度）

9和10一起说明：

统计IO操作：COUNT_STAR，SUM_TIMER_WAIT,MIN_TIMER_WAIT,AVG_TIMER_WAIT,MAX_TIMER_WAIT

统计读      ：COUNT_READ,SUM_TIMER_READ,MIN_TIMER_READ,AVG_TIMER_READ,MAX_TIMER_READ, SUM_NUMBER_OF_BYTES_READ

统计写      ：COUNT_WRITE,SUM_TIMER_WRITE,MIN_TIMER_WRITE,AVG_TIMER_WRITE,MAX_TIMER_WRITE, SUM_NUMBER_OF_BYTES_WRITE

统计其他IO事件，比如create，delete，open，close等：COUNT_MISC,SUM_TIMER_MISC,MIN_TIMER_MISC,AVG_TIMER_MISC,MAX_TIMER_MISC

11，table_io_waits_summary_by_table：根据wait/io/table/sql/handler，聚合每个表的I/O操作（逻辑IO纬度）

统计IO操作：COUNT_STAR,SUM_TIMER_WAIT,MIN_TIMER_WAIT,AVG_TIMER_WAIT,MAX_TIMER_WAIT 

统计读      ：COUNT_READ,SUM_TIMER_READ,MIN_TIMER_READ,AVG_TIMER_READ,MAX_TIMER_READ

              ：COUNT_FETCH,SUM_TIMER_FETCH,MIN_TIMER_FETCH,AVG_TIMER_FETCH, MAX_TIMER_FETCH

统计写      ：COUNT_WRITE,SUM_TIMER_WRITE,MIN_TIMER_WRITE,AVG_TIMER_WRITE,MAX_TIMER_WRITE

INSERT统计，相应的还有DELETE和UPDATE统计：COUNT_INSERT,SUM_TIMER_INSERT,MIN_TIMER_INSERT,AVG_TIMER_INSERT,MAX_TIMER_INSERT

12，table_io_waits_summary_by_index_usage：与table_io_waits_summary_by_table类似，按索引维度统计

13，table_lock_waits_summary_by_table：聚合了表锁等待事件，包括internal lock 和 external lock

internal lock通过SQL层函数thr_lock调用，OPERATION值为：
read normal、read with shared locks、read high priority、read no insert、write allow write、write concurrent insert、write delayed、write low priority、write normal
external lock则通过接口函数handler::external_lock调用存储引擎层，OPERATION列的值为：read external、write external

14，Connection Summaries表：account、user、host

events_waits_summary_by_account_by_event_name
events_waits_summary_by_user_by_event_name
events_waits_summary_by_host_by_event_name 
events_stages_summary_by_account_by_event_name
events_stages_summary_by_user_by_event_name
events_stages_summary_by_host_by_event_name 
events_statements_summary_by_account_by_event_name
events_statements_summary_by_user_by_event_name
events_statements_summary_by_host_by_event_name

15，socket_summary_by_instance、socket_summary_by_event_name：socket聚合统计表。

八：其他相关表

1，performance_timers：系统支持的统计时间单位

2，threads：监视服务端的当前运行的线程

统计应用：

      关于SQL维度的统计信息主要集中在events_statements_summary_by_digest表中，通过将SQL语句抽象出digest，可以统计某类SQL语句在各个维度的统计信息

1，哪个SQL执行最多：

view sourceprint?
01.zjy@performance_schema 11:36:22><strong>SELECT SCHEMA_NAME,DIGEST_TEXT,COUNT_STAR,SUM_ROWS_SENT,SUM_ROWS_EXAMINED,FIRST_SEEN,LAST_SEEN FROM events_statements_summary_by_digest ORDER BY COUNT_STAR desc LIMIT 1G
02.</strong>*************************** 1. row ***************************<strong>
03.SCHEMA_NAME</strong>: dchat
04.<strong>DIGEST_TEXT</strong>: SELECT ...
05.<strong>COUNT_STAR</strong>: 1161210102
06.SUM_ROWS_SENT: 1161207842
07.SUM_ROWS_EXAMINED: 0<strong>
08.FIRST_SEEN</strong>: 2016-02-17 00:36:46<strong>
09.LAST_SEEN</strong>: 2016-03-07 11:36:29

各个字段的注释可以看上面的表结构说明：从2月17号到3月7号该SQL执行了1161210102次。

2，哪个SQL平均响应时间最多：

view sourceprint?
01.zjy@performance_schema 11:36:28><strong>SELECT SCHEMA_NAME,DIGEST_TEXT,COUNT_STAR,AVG_TIMER_WAIT,SUM_ROWS_SENT,SUM_ROWS_EXAMINED,FIRST_SEEN,LAST_SEEN FROM events_statements_summary_by_digest ORDER BY AVG_TIMER_WAIT desc LIMIT 1G
02.</strong>*************************** 1. row ***************************<strong>
03.SCHEMA_NAME</strong>: dchat
04.<strong>DIGEST_TEXT</strong>: SELECT ...
05.COUNT_STAR: 1<strong>
06.AVG_TIMER_WAIT</strong>: 273238183964000
07.SUM_ROWS_SENT: 50208
08.SUM_ROWS_EXAMINED: 5565651<strong>
09.FIRST_SEEN</strong>: 2016-02-22 13:27:33<strong>
10.LAST_SEEN</strong>: 2016-02-22 13:27:33

各个字段的注释可以看上面的表结构说明：从2月17号到3月7号该SQL平均响应时间273238183964000皮秒（1000000000000皮秒=1秒）

3，哪个SQL扫描的行数最多：

SUM_ROWS_EXAMINED

4，哪个SQL使用的临时表最多：

SUM_CREATED_TMP_DISK_TABLES、SUM_CREATED_TMP_TABLES

5，哪个SQL返回的结果集最多：

SUM_ROWS_SENT

6，哪个SQL排序数最多：

SUM_SORT_ROWS

通过上述指标我们可以间接获得某类SQL的逻辑IO(SUM_ROWS_EXAMINED)，CPU消耗(SUM_SORT_ROWS)，网络带宽(SUM_ROWS_SENT)的对比。

通过file_summary_by_instance表，可以获得系统运行到现在，哪个文件(表)物理IO最多，这可能意味着这个表经常需要访问磁盘IO。

7，哪个表、文件逻辑IO最多（热数据）：

view sourceprint?
01.zjy@performance_schema 12:16:18><strong>SELECT FILE_NAME,EVENT_NAME,COUNT_READ,SUM_NUMBER_OF_BYTES_READ,COUNT_WRITE,SUM_NUMBER_OF_BYTES_WRITE FROM file_summary_by_instance ORDER BY SUM_NUMBER_OF_BYTES_READ+SUM_NUMBER_OF_BYTES_WRITE DESC LIMIT 2G
02.</strong>*************************** 1. row ***************************
03.FILE_NAME: /var/lib/mysql/<strong>ibdata1  #文件</strong>
04.EVENT_NAME: wait/io/file/innodb/innodb_data_file
05.COUNT_READ: 544
06.SUM_NUMBER_OF_BYTES_READ: 10977280
07.COUNT_WRITE: 3700729
08.SUM_NUMBER_OF_BYTES_WRITE: 1433734217728
09.*************************** 2. row ***************************
10.FILE_NAME: /var/lib/mysql/dchat/<strong>fans.ibd   #表</strong>
11.EVENT_NAME: wait/io/file/innodb/innodb_data_file
12.COUNT_READ: 9370680
13.SUM_NUMBER_OF_BYTES_READ: 153529188352
14.COUNT_WRITE: 67576376
15.SUM_NUMBER_OF_BYTES_WRITE: 1107815432192

8，哪个索引使用最多：

view sourceprint?
1.zjy@performance_schema 12:18:42><strong>SELECT OBJECT_NAME, INDEX_NAME, COUNT_FETCH, COUNT_INSERT, COUNT_UPDATE, COUNT_DELETE FROM table_io_waits_summary_by_index_usage ORDER BY SUM_TIMER_WAIT DESC limit 1;
2.</strong>+-------------+------------+-------------+--------------+--------------+--------------+
3.| OBJECT_NAME | INDEX_NAME | COUNT_FETCH | COUNT_INSERT | COUNT_UPDATE | COUNT_DELETE |
4.+-------------+------------+-------------+--------------+--------------+--------------+
5.| <strong>fans</strong>        | <strong>PRIMARY</strong>    | 29002695158 |            0|    296373434 |            0 |
6.+-------------+------------+-------------+--------------+--------------+--------------+
7.1 row in set (0.29 sec)

通过table_io_waits_summary_by_index_usage表，可以获得系统运行到现在，哪个表的具体哪个索引(包括主键索引，二级索引)使用最多。

9，哪个索引没有使用过：

view sourceprint?
1.zjy@performance_schema 12:23:22><strong>SELECT OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME FROM table_io_waits_summary_by_index_usage WHERE INDEX_NAME IS NOT NULL AND COUNT_STAR = 0 AND OBJECT_SCHEMA <> 'mysql' ORDER BY OBJECT_SCHEMA,OBJECT_NAME;</strong>

10，哪个等待事件消耗的时间最多：

view sourceprint?
1.zjy@performance_schema 12:25:22><strong>SELECT EVENT_NAME, COUNT_STAR, SUM_TIMER_WAIT, AVG_TIMER_WAIT FROM events_waits_summary_global_by_event_name WHERE event_name != 'idle'ORDER BY SUM_TIMER_WAIT DESC LIMIT 1;</strong>

11，类似profiling功能：

分析具体某条SQL，该SQL在执行各个阶段的时间消耗，通过events_statements_xxx表和events_stages_xxx表，就可以达到目的。两个表通过event_id与nesting_event_id关联，stages表的nesting_event_id为对应statements表的event_id；针对每个stage可能出现的锁等待，一个stage会对应一个或多个wait，通过stage_xxx表的event_id字段与waits_xxx表的nesting_event_id进行关联。如：

view sourceprint?
001.比如分析包含count(*)的某条SQL语句，具体如下：
002. 
003.SELECT
004.EVENT_ID,
005.sql_text
006.FROM events_statements_history
007.WHERE sql_text LIKE '%count(*)%';
008.+----------+--------------------------------------+
009.| EVENT_ID | sql_text |
010.+----------+--------------------------------------+
011.| 1690 | select count(*) from chuck.test_slow |
012.+----------+--------------------------------------+
013.首先得到了语句的event_id为1690，通过查找events_stages_xxx中nesting_event_id为1690的记录，可以达到目的。
014. 
015.a.查看每个阶段的时间消耗：
016.SELECT
017.event_id,
018.EVENT_NAME,
019.SOURCE,
020.TIMER_END - TIMER_START
021.FROM events_stages_history_long
022.WHERE NESTING_EVENT_ID = 1690;
023.+----------+--------------------------------+----------------------+-----------------------+
024.| event_id | EVENT_NAME | SOURCE | TIMER_END-TIMER_START |
025.+----------+--------------------------------+----------------------+-----------------------+
026.| 1691 | stage/sql/init | mysqld.cc:990 | 316945000 |
027.| 1693 | stage/sql/checking permissions | sql_parse.cc:5776 | 26774000 |
028.| 1695 | stage/sql/Opening tables | sql_base.cc:4970 | 41436934000 |
029.| 2638 | stage/sql/init | sql_select.cc:1050 | 85757000 |
030.| 2639 | stage/sql/System lock | lock.cc:303 | 40017000 |
031.| 2643 | stage/sql/optimizing | sql_optimizer.cc:138 | 38562000 |
032.| 2644 | stage/sql/statistics | sql_optimizer.cc:362 | 52845000 |
033.| 2645 | stage/sql/preparing | sql_optimizer.cc:485 | 53196000 |
034.| 2646 | stage/sql/executing | sql_executor.cc:112 | 3153000 |
035.| 2647 | stage/sql/Sending data | sql_executor.cc:192 | 7369072089000 |
036.| 4304138 | stage/sql/end | sql_select.cc:1105 | 19920000 |
037.| 4304139 | stage/sql/query end | sql_parse.cc:5463 | 44721000 |
038.| 4304145 | stage/sql/closing tables | sql_parse.cc:5524 | 61723000 |
039.| 4304152 | stage/sql/freeing items | sql_parse.cc:6838 | 455678000 |
040.| 4304155 | stage/sql/logging slow query | sql_parse.cc:2258 | 83348000 |
041.| 4304159 | stage/sql/cleaning up | sql_parse.cc:2163 | 4433000 |
042.+----------+--------------------------------+----------------------+-----------------------+
043.通过间接关联，我们能分析得到SQL语句在每个阶段的时间消耗，时间单位以皮秒表示。这里展示的结果很类似profiling功能，有了performance schema，就不再需要profiling这个功能了。另外需要注意的是，由于默认情况下events_stages_history表中只为每个连接记录了最近10条记录，为了确保获取所有记录，需要访问events_stages_history_long表
044. 
045.b.查看某个阶段的锁等待情况
046.针对每个stage可能出现的锁等待，一个stage会对应一个或多个wait，events_waits_history_long这个表容易爆满[默认阀值10000]。由于select count(*)需要IO(逻辑IO或者物理IO)，所以在stage/sql/Sending data阶段会有io等待的统计。通过stage_xxx表的event_id字段与waits_xxx表的nesting_event_id进行关联。
047.SELECT
048.event_id,
049.event_name,
050.source,
051.timer_wait,
052.object_name,
053.index_name,
054.operation,
055.nesting_event_id
056.FROM events_waits_history_long
057.WHERE nesting_event_id = 2647;
058.+----------+---------------------------+-----------------+------------+-------------+------------+-----------+------------------+
059.| event_id | event_name | source | timer_wait | object_name | index_name | operation | nesting_event_id |
060.+----------+---------------------------+-----------------+------------+-------------+------------+-----------+------------------+
061.| 190607 | wait/io/table/sql/handler | handler.cc:2842 | 1845888 | test_slow | idx_c1 | fetch | 2647 |
062.| 190608 | wait/io/table/sql/handler | handler.cc:2842 | 1955328 | test_slow | idx_c1 | fetch | 2647 |
063.| 190609 | wait/io/table/sql/handler | handler.cc:2842 | 1929792 | test_slow | idx_c1 | fetch | 2647 |
064.| 190610 | wait/io/table/sql/handler | handler.cc:2842 | 1869600 | test_slow | idx_c1 | fetch | 2647 |
065.| 190611 | wait/io/table/sql/handler | handler.cc:2842 | 1922496 | test_slow | idx_c1 | fetch | 2647 |
066.+----------+---------------------------+-----------------+------------+-------------+------------+-----------+------------------+
067.通过上面的实验，我们知道了statement,stage,wait的三级结构，通过nesting_event_id进行关联，它表示某个事件的父event_id。
068. 
069.(2).模拟innodb行锁等待的例子
070.会话A执行语句update test_icp set y=y+1 where x=1(x为primary key)，不commit；会话B执行同样的语句update test_icp set y=y+1 where x=1，会话B堵塞，并最终报错。通过连接连接查询events_statements_history_long和events_stages_history_long，可以看到在updating阶段花了大约60s的时间。这主要因为实例上的innodb_lock_wait_timeout设置为60，等待60s后超时报错了。
071. 
072.SELECT
073.statement.EVENT_ID,
074.stages.event_id,
075.statement.sql_text,
076.stages.event_name,
077.stages.timer_wait
078.FROM events_statements_history_long statement
079.join events_stages_history_long stages
080.on statement.event_id=stages.nesting_event_id
081.WHERE statement.sql_text = 'update test_icp set y=y+1 where x=1';
082.+----------+----------+-------------------------------------+--------------------------------+----------------+
083.| EVENT_ID | event_id | sql_text | event_name | timer_wait |
084.+----------+----------+-------------------------------------+--------------------------------+----------------+
085.| 5816 | 5817 | update test_icp set y=y+1 where x=1 | stage/sql/init | 195543000 |
086.| 5816 | 5819 | update test_icp set y=y+1 where x=1 | stage/sql/checking permissions |22730000 |
087.| 5816 | 5821 | update test_icp set y=y+1 where x=1 | stage/sql/Opening tables | 66079000 |
088.| 5816 | 5827 | update test_icp set y=y+1 where x=1 | stage/sql/init | 89116000 |
089.| 5816 | 5828 | update test_icp set y=y+1 where x=1 | stage/sql/System lock | 218744000 |
090.| 5816 | 5832 | update test_icp set y=y+1 where x=1 | stage/sql/updating | 6001362045000 |
091.| 5816 | 5968 | update test_icp set y=y+1 where x=1 | stage/sql/end | 10435000 |
092.| 5816 | 5969 | update test_icp set y=y+1 where x=1 | stage/sql/query end | 85979000 |
093.| 5816 | 5983 | update test_icp set y=y+1 where x=1 | stage/sql/closing tables | 56562000 |
094.| 5816 | 5990 | update test_icp set y=y+1 where x=1 | stage/sql/freeing items | 83563000 |
095.| 5816 | 5992 | update test_icp set y=y+1 where x=1 | stage/sql/cleaning up | 4589000 |
096.+----------+----------+-------------------------------------+--------------------------------+----------------+
097.查看wait事件：
098.SELECT
099.event_id,
100.event_name,
101.source,
102.timer_wait,
103.object_name,
104.index_name,
105.operation,
106.nesting_event_id
107.FROM events_waits_history_long
108.WHERE nesting_event_id = 5832;
109.*************************** 1. row ***************************
110.event_id: 5832
111.event_name: wait/io/table/sql/handler
112.source: handler.cc:2782
113.timer_wait: 6005946156624
114.object_name: test_icp
115.index_name: PRIMARY
116.operation: fetch
117.从结果来看，waits表中记录了一个fetch等待事件，但并没有更细的innodb行锁等待事件统计。
118. 
119.(3).模拟MDL锁等待的例子
120.会话A执行一个大查询select count(*) from test_slow，会话B执行表结构变更alter table test_slow modify c2 varchar(152);通过如下语句可以得到alter语句的执行过程，重点关注“stage/sql/Waiting for table metadata lock”阶段。
121. 
122.SELECT
123.statement.EVENT_ID,
124.stages.event_id,
125.statement.sql_text,
126.stages.event_name as stage_name,
127.stages.timer_wait as stage_time
128.FROM events_statements_history_long statement
129.left join events_stages_history_long stages
130.on statement.event_id=stages.nesting_event_id
131.WHERE statement.sql_text = 'alter table test_slow modify c2 varchar(152)';
132.+-----------+-----------+----------------------------------------------+----------------------------------------------------+---------------+
133.| EVENT_ID | event_id | sql_text | stage_name | stage_time |
134.+-----------+-----------+----------------------------------------------+----------------------------------------------------+---------------+
135.| 326526744 | 326526745 | alter table test_slow modify c2 varchar(152) | stage/sql/init |216662000 |
136.| 326526744 | 326526747 | alter table test_slow modify c2 varchar(152) | stage/sql/checking permissions | 18183000 |
137.| 326526744 | 326526748 | alter table test_slow modify c2 varchar(152) | stage/sql/checking permissions | 10294000 |
138.| 326526744 | 326526750 | alter table test_slow modify c2 varchar(152) | stage/sql/init |4783000 |
139.| 326526744 | 326526751 | alter table test_slow modify c2 varchar(152) | stage/sql/Opening tables | 140172000 |
140.| 326526744 | 326526760 | alter table test_slow modify c2 varchar(152) | stage/sql/setup |157643000 |
141.| 326526744 | 326526769 | alter table test_slow modify c2 varchar(152) | stage/sql/creating table | 8723217000 |
142.| 326526744 | 326526803 | alter table test_slow modify c2 varchar(152) | stage/sql/After create | 257332000 |
143.| 326526744 | 326526832 | alter table test_slow modify c2 varchar(152) | stage/sql/Waitingfor table metadata lock | 1000181831000 |
144.| 326526744 | 326526835 | alter table test_slow modify c2 varchar(152) | stage/sql/After create | 33483000 |
145.| 326526744 | 326526838 | alter table test_slow modify c2 varchar(152) | stage/sql/Waitingfor table metadata lock | 1000091810000 |
146.| 326526744 | 326526841 | alter table test_slow modify c2 varchar(152) | stage/sql/After create | 17187000 |
147.| 326526744 | 326526844 | alter table test_slow modify c2 varchar(152) | stage/sql/Waitingfor table metadata lock | 1000126464000 |
148.| 326526744 | 326526847 | alter table test_slow modify c2 varchar(152) | stage/sql/After create | 27472000 |
149.| 326526744 | 326526850 | alter table test_slow modify c2 varchar(152) | stage/sql/Waitingfor table metadata lock | 561996133000 |
150.| 326526744 | 326526853 | alter table test_slow modify c2 varchar(152) | stage/sql/After create | 124876000 |
151.| 326526744 | 326526877 | alter table test_slow modify c2 varchar(152) | stage/sql/System lock | 30659000 |
152.| 326526744 | 326526881 | alter table test_slow modify c2 varchar(152) | stage/sql/preparingfor alter table | 40246000 |
153.| 326526744 | 326526889 | alter table test_slow modify c2 varchar(152) | stage/sql/altering table | 36628000 |
154.| 326526744 | 326528280 | alter table test_slow modify c2 varchar(152) | stage/sql/end |43824000 |
155.| 326526744 | 326528281 | alter table test_slow modify c2 varchar(152) | stage/sql/query end | 112557000 |
156.| 326526744 | 326528299 | alter table test_slow modify c2 varchar(152) | stage/sql/closing tables | 27707000 |
157.| 326526744 | 326528305 | alter table test_slow modify c2 varchar(152) | stage/sql/freeing items | 201614000 |
158.| 326526744 | 326528308 | alter table test_slow modify c2 varchar(152) | stage/sql/cleaning up | 3584000 |
159.+-----------+-----------+----------------------------------------------+----------------------------------------------------+---------------+
160.从结果可以看到，出现了多次stage/sql/Waiting for table metadata lock阶段，并且间隔1s，说明每隔1s钟会重试判断。找一个该阶段的event_id,通过nesting_event_id关联，确定到底在等待哪个wait事件。
161.SELECT
162.event_id,
163.event_name,
164.source,
165.timer_wait,
166.object_name,
167.index_name,
168.operation,
169.nesting_event_id
170.FROM events_waits_history_long
171.WHERE nesting_event_id = 326526850;
172.+-----------+---------------------------------------------------+------------------+--------------+-------------+------------+------------+------------------+
173.| event_id | event_name | source | timer_wait | object_name | index_name | operation | nesting_event_id |
174.+-----------+---------------------------------------------------+------------------+--------------+-------------+------------+------------+------------------+
175.| 326526851 | wait/synch/cond/sql/MDL_context::COND_wait_status | mdl.cc:1327 | 562417991328| NULL | NULL | timed_wait | 326526850 |
176.| 326526852 | wait/synch/mutex/mysys/my_thread_var::mutex | sql_class.h:3481 | 733248 | NULL | NULL | lock | 326526850 |
177.+-----------+---------------------------------------------------+------------------+--------------+-------------+------------+------------+------------------+
178.通过结果可以知道，产生阻塞的是条件变量MDL_context::COND_wait_status，并且显示了代码的位置。

总结：

本文通过对Performance Schema数据库的介绍，主要用于收集数据库服务器性能参数：①提供进程等待的详细信息，包括锁、互斥变量、文件信息；②保存历史的事件汇总信息，为提供MySQL服务器性能做出详细的判断；③对于新增和删除监控事件点都非常容易，并可以改变mysql服务器的监控周期，例如（CYCLE、MICROSECOND）。通过该库得到数据库运行的统计信息，更好分析定位问题和完善监控信息。类似的监控还有：

view sourceprint?
1.打开标准的innodb监控：
2.CREATE TABLE innodb_monitor (a INT) ENGINE=INNODB;
3.打开innodb的锁监控：
4.CREATE TABLE innodb_lock_monitor (a INT) ENGINE=INNODB;
5.打开innodb表空间监控：
6.CREATE TABLE innodb_tablespace_monitor (a INT) ENGINE=INNODB;
7.打开innodb表监控：
8.CREATE TABLE innodb_table_monitor (a INT) ENGINE=INNODB;
标签
事件记录
bigint
mysql
select
unsigned
history
mysql数据库
皮秒
易学教程内所有资源均来自网络或用户发布的内容，如有违反法律规定的内容欢迎反馈！
该文章没有解决你所遇到的问题?点击提问,说说你的问题,让更多的人一起探讨吧!