MySQL5.6PERFORMANCE_SCHEMA说明_MySQL-Mysql Tutorial-php.cn

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.<code class="plain">[mysqld]<code class="number">2.<code class="plain">performance_schema=ON

<code class="plain"><code class="number"><code class="plain">查看是否开启：

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1.
mysql>show
 variables like 
&#39;performance_schema&#39;
;
2.
+--------------------+-------+
3.
|
 Variable_name      | Value |
4.
+--------------------+-------+
5.
|
 performance_schema | 
ON
    |
6.
+--------------------+-------+

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<code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="string"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">

<code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">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。

<code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">相关表信息：

<code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">一：配置（setup）表：

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01.
zjy
@performance_schema 
10
:
16
:
56
>show
 tables like 
&#39;%setup%&#39;
;
02.
+----------------------------------------+
03.
|
 Tables_in_performance_schema (%setup%) |
04.
+----------------------------------------+
05.
|
 setup_actors                           |
06.
|
 setup_consumers                        |
07.
|
 setup_instruments                      |
08.
|
 setup_objects                          |
09.
|
 setup_timers                           |
10.
+----------------------------------------+

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<code class="color1"><code class="value"><code class="value"><code class="value"><code class="string"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">1，setup_actors：配置用户纬度的监控，默认监控所有用户。

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

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<code class="color1"><code class="string"><code class="color1"><code class="value"><code class="value"><code class="value"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">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。

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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.
+--------------------------------+---------+

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<code class="color1"><code class="string"><code class="color1"><code class="value"><code class="value"><code class="value"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">这里需要说明的是需要查看哪个就更新其ENABLED列为YES。如：

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1.
zjy
@performance_schema 
10
:
25
:
02
>update
 setup_consumers set ENABLED=
&#39;YES&#39; 
where
 NAME in (
&#39;events_stages_current&#39;
,
&#39;events_waits_current&#39;
);
2.
Query
 OK, 
2 
rows
 affected (
0.00 
sec)

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<code class="color1"><code class="number"><code class="number"><code class="color1"><code class="value"><code class="string"><code class="string"><code class="string"><code class="number"><code class="plain"><code class="value"><code class="plain"><code class="value"><code class="plain">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：

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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

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<code class="color1"><code class="color1"><code class="value"><code class="string"><code class="string"><code class="string"><code class="value"><code class="value"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">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：

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1.
global_instrumentation

 > 
thread_instrumentation
 = 
statements_digest
 > events_stages_
current
 = events_statements_current = events_waits_current > events_stages_
history
 = events_statements_history = events_waits_history
 > events_stages_
history_long
 = events_statements_history_long = events_waits_history_long

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<code class="color1"><code class="color1"><code class="value"><code class="string"><code class="string"><code class="string"><code class="value"><code class="value"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">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：

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01.
zjy
@performance_schema 
11
:
10
:
03
>show
 variables like 
&#39;performance_schema%history%size&#39;
;
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：
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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.
+---------------------------------+----------+

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<code class="string"><code class="string"><code class="color1"><code class="string"><code class="color1"><code class="value"><code class="number"><code class="value"><code class="number"><code class="plain"><code class="value"><code class="plain"><code class="number"><code class="plain">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。

<code class="string"><code class="string"><code class="color1"><code class="string"><code class="color1"><code class="value"><code class="number"><code class="value"><code class="number"><code class="plain"><code class="value"><code class="plain"><code class="number"><code class="plain">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。

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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       | %                  | %           | 
YES
     | 
YES
   |
09.
+-------------+--------------------+-------------+---------+-------+

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<code class="string"><code class="color1"><code class="string"><code class="color1"><code class="color1"><code class="value"><code class="value"><code class="value"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">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）

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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.
+-----------+-------------+

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<code class="string"><code class="string"><code class="color1"><code class="color1"><code class="color1"><code class="value"><code class="value"><code class="value"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain"><strong>二：instance表</strong>

<code class="string"><code class="string"><code class="color1"><code class="color1"><code class="color1"><code class="value"><code class="value"><code class="value"><code class="number"><code class="plain"><code class="number"><code class="plain"><code class="number"><code class="plain">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。

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01.
zjy
@performance_schema 
11
:
20
:
04
>select
 * from file_instances limit 
2
,
5
;
02.
+---------------------------------+--------------------------------------+------------+
03.
|
 FILE_NAME                       | EVENT_NAME                           | 
OPEN_COUNT
 |
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.
+---------------------------------+--------------------------------------+------------+

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<code class="string"><code class="string"><code class="color1"><code class="color1"><code class="color1"><code class="value"><code class="number"><code class="value"><code class="number"><code class="plain"><code class="value"><code class="plain"><code class="number"><code class="plain">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。

<code class="string"><code class="string"><code class="color1"><code class="color1"><code class="color1"><code class="value"><code class="number"><code class="value"><code class="number"><code class="plain"><code class="value"><code class="plain"><code class="number"><code class="plain">4，rwlock_instances：读写锁同步对象实例

<code class="string"><code class="string"><code class="color1"><code class="color1"><code class="color1"><code class="value"><code class="number"><code class="value"><code class="number"><code class="plain"><code class="value"><code class="plain"><code class="number"><code class="plain">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）。

<code class="string"><code class="string"><code class="string"><code class="color1"><code class="color1"><code class="color1"><code class="value"><code class="number"><code class="value"><code class="number"><code class="plain"><code class="value"><code class="plain"><code class="number"><code class="plain">wait/io/socket/sql/server_unix_socket，服务端unix监听socket<br/>wait/io/socket/sql/server_tcpip_socket，服务端tcp监听socket<br/>wait/io/socket/sql/client_connection，客户端socket<br/></code></code></code></code></code></code></code></code></code></code></code></code></code></code></code>

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<code class="string"><code class="string"><code class="color1"><code class="color1"><code class="color1"><code class="value"><code class="number"><code class="value"><code class="number"><code class="plain"><code class="value"><code class="plain"><code class="number"><code class="plain">1，events_waits_current：记录了当前线程等待的事件

<code class="string"><code class="string"><code class="color1"><code class="color1"><code class="color1"><code class="value"><code class="number"><code class="value"><code class="number"><code class="plain"><code class="value"><code class="plain"><code class="number"><code class="plain">2，events_waits_history：记录了每个线程最近等待的10个事件

<code class="string"><code class="string"><code class="color1"><code class="color1"><code class="color1"><code class="value"><code class="number"><code class="value"><code class="number"><code class="plain"><code class="value"><code class="plain"><code class="number"><code class="plain">3，events_waits_history_long：记录了最近所有线程产生的10000个事件

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01.
CREATE
 TABLE `events_waits_current` (
02.
`THREAD_ID`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;线程ID&#39;
,
03.
`EVENT_ID`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;当前线程的事件ID，和THREAD_ID确定唯一&#39;
,
04.
`END_EVENT_ID`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;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&#39;
,
05.
`EVENT_NAME`
 varchar(
128
)
 NOT NULL COMMENT 
&#39;事件名称&#39;
,
06.
`SOURCE`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&#39;该事件产生时的源码文件&#39;
,
07.
`TIMER_START`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;事件开始时间（皮秒）&#39;
,
08.
`TIMER_END`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;事件结束结束时间（皮秒）&#39;
,
09.
`TIMER_WAIT`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;事件等待时间（皮秒）&#39;
,
10.
`SPINS` 
int
(
10
)
 unsigned DEFAULT NULL COMMENT 
&#39;&#39;
,
11.
`OBJECT_SCHEMA`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&#39;库名&#39;
,
12.
`OBJECT_NAME`
 varchar(
512
)
 DEFAULT NULL COMMENT 
&#39;文件名、表名、IP:SOCK值&#39;
,
13.
`OBJECT_TYPE`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&#39;FILE、TABLE、TEMPORARY
 TABLE&#39;
,
14.
`INDEX_NAME`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&#39;索引名&#39;
,
15.
`OBJECT_INSTANCE_BEGIN`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;内存地址&#39;
,
16.
`NESTING_EVENT_ID`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;该事件对应的父事件ID&#39;
,
17.
`NESTING_EVENT_TYPE` 
enum
(
&#39;STATEMENT&#39;
,
&#39;STAGE&#39;
,
&#39;WAIT&#39;
)
 DEFAULT NULL COMMENT 
&#39;父事件类型(STATEMENT,
 STAGE, WAIT)&#39;
,
18.
`OPERATION`
 varchar(
32
)
 NOT NULL COMMENT 
&#39;操作类型（lock,
 read, write）&#39;
,
19.
`NUMBER_OF_BYTES`
 bigint(
20
)
 DEFAULT NULL COMMENT 
&#39;&#39;
,
20.
`FLAGS` 
int
(
10
)
 unsigned DEFAULT NULL COMMENT 
&#39;标记&#39;
21.
)
 ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8

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<code class="color1"><code class="color1"><code class="keyword"><code class="keyword"><code class="value"><code class="string"><code class="number"><code class="value"><code class="string"><code class="number"><code class="keyword"><code class="plain"><code class="value"><code class="plain"><code class="string"><code class="number"><code class="plain">四：Stage 表

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01.
CREATE
 TABLE `events_stages_current` (
02.
`THREAD_ID`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;线程ID&#39;
,
03.
`EVENT_ID`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;事件ID&#39;
,
04.
`END_EVENT_ID`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;结束事件ID&#39;
,
05.
`EVENT_NAME`
 varchar(
128
)
 NOT NULL COMMENT 
&#39;事件名称&#39;
,
06.
`SOURCE`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&#39;源码位置&#39;
,
07.
`TIMER_START`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;事件开始时间（皮秒）&#39;
,
08.
`TIMER_END`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;事件结束结束时间（皮秒）&#39;
,
09.
`TIMER_WAIT`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;事件等待时间（皮秒）&#39;
,
10.
`NESTING_EVENT_ID`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;该事件对应的父事件ID&#39;
,
11.
`NESTING_EVENT_TYPE` 
enum
(
&#39;STATEMENT&#39;
,
&#39;STAGE&#39;
,
&#39;WAIT&#39;
)
 DEFAULT NULL COMMENT 
&#39;父事件类型(STATEMENT,
 STAGE, WAIT)&#39;
12.
)
 ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8

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<code class="color1"><code class="color1"><code class="keyword"><code class="keyword"><code class="value"><code class="value"><code class="number"><code class="value"><code class="number"><code class="keyword"><code class="string"><code class="plain"><code class="string"><code class="plain"><code class="string"><code class="number"><code class="plain">五：Statement 表

<code class="color1"><code class="color1"><code class="keyword"><code class="keyword"><code class="value"><code class="value"><code class="number"><code class="value"><code class="number"><code class="keyword"><code class="string"><code class="plain"><code class="string"><code class="plain"><code class="string"><code class="number"><code class="plain">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/*

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 sourceprint?
01.
CREATE
 TABLE `events_statements_current` (
02.
`THREAD_ID`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;线程ID&#39;
,
03.
`EVENT_ID`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;事件ID&#39;
,
04.
`END_EVENT_ID`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;结束事件ID&#39;
,
05.
`EVENT_NAME`
 varchar(
128
)
 NOT NULL COMMENT 
&#39;事件名称&#39;
,
06.
`SOURCE`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&#39;源码位置&#39;
,
07.
`TIMER_START`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;事件开始时间（皮秒）&#39;
,
08.
`TIMER_END`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;事件结束结束时间（皮秒）&#39;
,
09.
`TIMER_WAIT`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;事件等待时间（皮秒）&#39;
,
10.
`LOCK_TIME`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;锁时间&#39;
,
11.
`SQL_TEXT`
 longtext COMMENT 
&#39;记录SQL语句&#39;
,
12.
`DIGEST`
 varchar(
32
)
 DEFAULT NULL COMMENT 
&#39;对SQL_TEXT做MD5产生的32位字符串&#39;
,
13.
`DIGEST_TEXT`
 longtext COMMENT 
&#39;将语句中值部分用问号代替，用于SQL语句归类&#39;
,
14.
`CURRENT_SCHEMA`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&#39;默认的数据库名&#39;
,
15.
`OBJECT_TYPE`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&#39;保留字段&#39;
,
16.
`OBJECT_SCHEMA`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&#39;保留字段&#39;
,
17.
`OBJECT_NAME`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&#39;保留字段&#39;
,
18.
`OBJECT_INSTANCE_BEGIN`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;内存地址&#39;
,
19.
`MYSQL_ERRNO` 
int
(
11
)
 DEFAULT NULL COMMENT 
&#39;&#39;
,
20.
`RETURNED_SQLSTATE`
 varchar(
5
)
 DEFAULT NULL COMMENT 
&#39;&#39;
,
21.
`MESSAGE_TEXT`
 varchar(
128
)
 DEFAULT NULL COMMENT 
&#39;信息&#39;
,
22.
`ERRORS`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;错误数目&#39;
,
23.
`WARNINGS`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;警告数目&#39;
,
24.
`ROWS_AFFECTED`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;影响的数目&#39;
,
25.
`ROWS_SENT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;返回的记录数&#39;
,
26.
`ROWS_EXAMINED`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;读取扫描的记录数目&#39;
,
27.
`CREATED_TMP_DISK_TABLES`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;创建磁盘临时表数目&#39;
,
28.
`CREATED_TMP_TABLES`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;创建临时表数目&#39;
,
29.
`SELECT_FULL_JOIN`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;join时，第一个表为全表扫描的数目&#39;
,
30.
`SELECT_FULL_RANGE_JOIN`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;引用表采用range方式扫描的数目&#39;
,
31.
`SELECT_RANGE`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;join时，第一个表采用range方式扫描的数目&#39;
,
32.
`SELECT_RANGE_CHECK`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;&#39;
,
33.
`SELECT_SCAN`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;join时，第一个表位全表扫描的数目&#39;
,
34.
`SORT_MERGE_PASSES`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;&#39;
,
35.
`SORT_RANGE`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;范围排序数目&#39;
,
36.
`SORT_ROWS`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;排序的记录数目&#39;
,
37.
`SORT_SCAN`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;全表排序数目&#39;
,
38.
`NO_INDEX_USED`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;没有使用索引数目&#39;
,
39.
`NO_GOOD_INDEX_USED`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;&#39;
,
40.
`NESTING_EVENT_ID`
 bigint(
20
)
 unsigned DEFAULT NULL COMMENT 
&#39;该事件对应的父事件ID&#39;
,
41.
`NESTING_EVENT_TYPE` 
enum
(
&#39;STATEMENT&#39;
,
&#39;STAGE&#39;
,
&#39;WAIT&#39;
)
 DEFAULT NULL COMMENT 
&#39;父事件类型(STATEMENT,
 STAGE, WAIT)&#39;
42.
)
 ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8view
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<code class="color1"><code class="color1"><code class="keyword"><code class="keyword"><code class="value"><code class="value"><code class="value"><code class="number"><code class="keyword"><code class="string"><code class="string"><code class="plain"><code class="string"><code class="number"><code class="plain"><code class="number">六：Connection 表

<code class="color1"><code class="color1"><code class="keyword"><code class="keyword"><code class="value"><code class="value"><code class="value"><code class="number"><code class="keyword"><code class="string"><code class="string"><code class="plain"><code class="string"><code class="number"><code class="plain"><code class="number"><img alt="加载中..." title="图片加载中..." src="http://img.bitscn.com/upimg/allimg/c160504/14623310K54E0-2C33.jpg"/><img alt="加载中..." title="图片加载中..." src="http://img.bitscn.com/upimg/allimg/c160504/14623310K54E0-2C33.jpg"/><code class="number">

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.
+------------------+-----------------+---------------------+-------------------+view
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1.
CREATE
 TABLE `events_waits_summary_global_by_event_name` (
2.
`EVENT_NAME`
 varchar(
128
)
 NOT NULL COMMENT 
&#39;事件名称&#39;
,
3.
`COUNT_STAR`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;事件计数&#39;
,
4.
`SUM_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;总的等待时间&#39;
,
5.
`MIN_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;最小等待时间&#39;
,
6.
`AVG_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;平均等待时间&#39;
,
7.
`MAX_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;最大等待时间&#39;
8.
)
 ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8view
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<code class="color1"><code class="color1"><code class="keyword"><code class="keyword"><code class="value"><code class="value"><code class="value"><code class="number"><code class="keyword"><code class="string"><code class="string"><code class="plain"><code class="string"><code class="number"><code class="plain"><code class="number"><br/><code class="number">

01.
CREATE
 TABLE `events_waits_summary_by_instance` (
02.
`EVENT_NAME`
 varchar(
128
)
 NOT NULL COMMENT 
&#39;事件名称&#39;
,
03.
`OBJECT_INSTANCE_BEGIN`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;内存地址&#39;
,
04.
`COUNT_STAR`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;事件计数&#39;
,
05.
`SUM_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;总的等待时间&#39;
,
06.
`MIN_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;最小等待时间&#39;
,
07.
`AVG_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;平均等待时间&#39;
,
08.
`MAX_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;最大等待时间&#39;
09.
)
 ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8view
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01.
CREATE
 TABLE `events_waits_summary_by_thread_by_event_name` (
02.
`THREAD_ID`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;线程ID&#39;
,
03.
`EVENT_NAME`
 varchar(
128
)
 NOT NULL COMMENT 
&#39;事件名称&#39;
,
04.
`COUNT_STAR`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;事件计数&#39;
,
05.
`SUM_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;总的等待时间&#39;
,
06.
`MIN_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;最小等待时间&#39;
,
07.
`AVG_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;平均等待时间&#39;
,
08.
`MAX_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&#39;最大等待时间&#39;
09.
)
 ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8view
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CREATE
 TABLE `events_statements_summary_by_digest` (
02.
`SCHEMA_NAME`
 varchar(
64
)
 DEFAULT NULL COMMENT 
&amp;#39;库名&amp;#39;
,
03.
`DIGEST`
 varchar(
32
)
 DEFAULT NULL COMMENT 
&amp;#39;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&amp;#39;
,
04.
`DIGEST_TEXT`
 longtext COMMENT 
&amp;#39;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。&amp;#39;
,
05.
`COUNT_STAR`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;事件计数&amp;#39;
,
06.
`SUM_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;总的等待时间&amp;#39;
,
07.
`MIN_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;最小等待时间&amp;#39;
,
08.
`AVG_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;平均等待时间&amp;#39;
,
09.
`MAX_TIMER_WAIT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;最大等待时间&amp;#39;
,
10.
`SUM_LOCK_TIME`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;锁时间总时长&amp;#39;
,
11.
`SUM_ERRORS`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;错误数的总&amp;#39;
,
12.
`SUM_WARNINGS`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;警告的总数&amp;#39;
,
13.
`SUM_ROWS_AFFECTED`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;影响的总数目&amp;#39;
,
14.
`SUM_ROWS_SENT`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;返回总数目&amp;#39;
,
15.
`SUM_ROWS_EXAMINED`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;总的扫描的数目&amp;#39;
,
16.
`SUM_CREATED_TMP_DISK_TABLES`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;创建磁盘临时表的总数目&amp;#39;
,
17.
`SUM_CREATED_TMP_TABLES`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;创建临时表的总数目&amp;#39;
,
18.
`SUM_SELECT_FULL_JOIN`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;第一个表全表扫描的总数目&amp;#39;
,
19.
`SUM_SELECT_FULL_RANGE_JOIN`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;总的采用range方式扫描的数目&amp;#39;
,
20.
`SUM_SELECT_RANGE`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;第一个表采用range方式扫描的总数目&amp;#39;
,
21.
`SUM_SELECT_RANGE_CHECK`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;&amp;#39;
,
22.
`SUM_SELECT_SCAN`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;第一个表位全表扫描的总数目&amp;#39;
,
23.
`SUM_SORT_MERGE_PASSES`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;&amp;#39;
,
24.
`SUM_SORT_RANGE`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;范围排序总数&amp;#39;
,
25.
`SUM_SORT_ROWS`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;排序的记录总数目&amp;#39;
,
26.
`SUM_SORT_SCAN`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;第一个表排序扫描总数目&amp;#39;
,
27.
`SUM_NO_INDEX_USED`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;没有使用索引总数&amp;#39;
,
28.
`SUM_NO_GOOD_INDEX_USED`
 bigint(
20
)
 unsigned NOT NULL COMMENT 
&amp;#39;&amp;#39;
,
29.
`FIRST_SEEN`
 timestamp NOT NULL DEFAULT 
&amp;#39;0000-00-00
 00:00:00&amp;#39; 
COMMENT 
&amp;#39;第一次执行时间&amp;#39;
,
30.
`LAST_SEEN`
 timestamp NOT NULL DEFAULT 
&amp;#39;0000-00-00
 00:00:00&amp;#39; 
COMMENT 
&amp;#39;最后一次执行时间&amp;#39;
31.
)
 ENGINE=PERFORMANCE_SCHEMA DEFAULT CHARSET=utf8view
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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 normalexternal 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_nameevents_waits_summary_by_user_by_event_nameevents_waits_summary_by_host_by_event_name events_stages_summary_by_account_by_event_nameevents_stages_summary_by_user_by_event_nameevents_stages_summary_by_host_by_event_name events_statements_summary_by_account_by_event_nameevents_statements_summary_by_user_by_event_nameevents_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：

01.
zjy
@performance_schema 
11
:
36
:
22
>*************************** 
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.
1
.
 row ***************************:
 dchat
03.
SCHEMA_NAME
04.
:
 SELECT ...
DIGEST_TEXT
05.
: 
COUNT_STAR
1161210102
06.
SUM_ROWS_SENT: 
1161207842
07.
SUM_ROWS_EXAMINED: 
0
: 
08.
FIRST_SEEN
2016
-
02
-
17 
00
:
36
:
46
: 
09.
LAST_SEEN
2016
-
03
-
07 
11
:
36
:
29view
 sourceprint?

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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：

01.
zjy
@performance_schema 
11
:
36
:
28
>*************************** 
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.
1
.
 row ***************************
<co

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