公告

CALL sys.ps_setup_enable_instrument('wait');
CALL sys.ps_setup_enable_instrument('stage');
CALL sys.ps_setup_enable_instrument('statement');
CALL sys.ps_setup_enable_consumer('current');
CALL sys.ps_setup_enable_consumer('history_long');

注意点：

对于很多sys的使用，默认的性能框架数据收集就能够满足，启动所有的记录点和消费者会对性能有一点影响，所以最好只启动你要的配置。通过这个函数也可以返回默认配置：

CALL sys.ps_setup_reset_to_default(TRUE);

24.2 使用sys框架

查看sys版本和mysql版本：

mysql> USE sys;

Database changed

mysql> SELECT * FROM version;

+-------------+-----------------+

| sys_version | mysql_version |

+-------------+-----------------+

| 1.5.0 | 5.7.9-debug-log |

+-------------+-----------------+

Sys框架下包含了很多视图合计了性能框架的表。很多这些视图成对出现的，比如一个成员的名字和另外一个一样，只是加了x$的前缀。比如host_summary_by_file_io有个名字一样的x$host_summary_by_file_io，2个显示的单位不同。

mysql> SELECT * FROM host_summary_by_file_io;

+------------+-------+------------+

| host | ios | io_latency |

+------------+-------+------------+

| localhost | 67570 | 5.38 s |

| background | 3468 | 4.18 s |

+------------+-------+------------+

mysql> SELECT * FROM x$host_summary_by_file_io;

+------------+-------+---------------+

| host | ios | io_latency |

+------------+-------+---------------+

| localhost | 67574 | 5380678125144 |

| background | 3474 | 4758696829416 |

+------------+-------+---------------+

没有x$前缀的表更容易读。带x$和不带x$显示的数值是一样大的用来用具获取和处理这些数据。

可以使用show 语句或者information_schema的查询获取对象的定义比如：

mysql> SHOW CREATE VIEW session;

mysql> SHOW CREATE FUNCTION format_bytes;

mysqldump，mysqlpump默认不导出sys框架，导出sys需要显示设置：

mysqldump --databases --routines sys > sys_dump.sql
mysqlpump sys > sys_dump.sql

导入sys结构：

mysql < sys_dump.sql

24.3 sys框架进度报告

Mysql 5.7.9，在sys下提供了长运行事务的进度报告：

Processlist
session
x$processlist
x$session

假设请求的记录点和消费者已经启动了，这些视图的progress列显示了完成的百分比。

stage进度报告要启动events_stages_current消费者，还有一些需要启动的记录点信息：

stage/sql/Copying to tmp table
stage/innodb/alter table (end)
stage/innodb/alter table (flush)
stage/innodb/alter table (insert)
stage/innodb/alter table (log apply index)
stage/innodb/alter table (log apply table)
stage/innodb/alter table (merge sort)
stage/innodb/alter table (read PK 和 internal sort)
stage/innodb/buffer pool load

对于stage不支持简历和完成工作报告，如果请求记录点和消费者没有启动，progress列为null。

24.4 sys框架的对象

24.4.1所有sys下的对象

Table 24.1 sys Schema Tables 和 Triggers

Table or Trigger Name	Description
sys_config	sys schema configuration options
sys_config_insert_set_user	sys_config insert trigger
sys_config_update_set_user	sys_config update trigger

Table 24.2 sys Schema Views

View Name	Description
host_summary, x$host_summary	Statement activity, file I/O, 和 connections, grouped by host
host_summary_by_file_io, x$host_summary_by_file_io	File I/O, grouped by host
host_summary_by_file_io_type, x$host_summary_by_file_io_type	File I/O, grouped by host 和 event type
host_summary_by_stages, x$host_summary_by_stages	Statement stages, grouped by host
host_summary_by_statement_latency, x$host_summary_by_statement_latency	Statement statistics, grouped by host
host_summary_by_statement_type, x$host_summary_by_statement_type	Statements executed, grouped by host 和 statement
innodb_buffer_stats_by_schema, x$innodb_buffer_stats_by_schema	InnoDB buffer information, grouped by schema
innodb_buffer_stats_by_table, x$innodb_buffer_stats_by_table	InnoDB buffer information, grouped by schema 和 table
innodb_lock_waits, x$innodb_lock_waits	InnoDB lock information
io_by_thread_by_latency, x$io_by_thread_by_latency	I/O consumers, grouped by thread
io_global_by_file_by_bytes, x$io_global_by_file_by_bytes	Global I/O consumers, grouped by file 和 bytes
io_global_by_file_by_latency, x$io_global_by_file_by_latency	Global I/O consumers, grouped by file 和 latency
io_global_by_wait_by_bytes, x$io_global_by_wait_by_bytes	Global I/O consumers, grouped by bytes
io_global_by_wait_by_latency, x$io_global_by_wait_by_latency	Global I/O consumers, grouped by latency
latest_file_io, x$latest_file_io	Most recent I/O, grouped by file 和 thread
memory_by_host_by_current_bytes, x$memory_by_host_by_current_bytes	Memory use, grouped by host
memory_by_thread_by_current_bytes, x$memory_by_thread_by_current_bytes	Memory use, grouped by thread
memory_by_user_by_current_bytes, x$memory_by_user_by_current_bytes	Memory use, grouped by user
memory_global_by_current_bytes, x$memory_global_by_current_bytes	Memory use, grouped by allocation type
memory_global_total, x$memory_global_total	Total memory use
metrics	Server metrics
processlist, x$processlist	Processlist information
ps_check_lost_instrumentation	Variables that have lost instruments
schema_auto_increment_columns	AUTO_INCREMENT column information
schema_index_statistics, x$schema_index_statistics	Index statistics
schema_object_overview	Types of objects within each schema
schema_redundant_indexes	Duplicate or redundant indexes
schema_table_lock_waits, x$schema_table_lock_waits	Sessions waiting for metadata locks
schema_table_statistics, x$schema_table_statistics	Table statistics
schema_table_statistics_with_buffer,x$schema_table_statistics_with_buffer	Table statistics, including InnoDB buffer pool statistics
schema_tables_with_full_table_scans,x$schema_tables_with_full_table_scans	Tables being accessed with full scans
schema_unused_indexes	Indexes not in active use
session, x$session	Processlist information for user sessions
session_ssl_status	Connection SSL information
statement_analysis, x$statement_analysis	Statement aggregate statistics
statements_with_errors_or_warnings, x$statements_with_errors_or_warnings	Statements that have produced errors or warnings
statements_with_full_table_scans, x$statements_with_full_table_scans	Statements that have done full table scans
statements_with_runtimes_in_95th_percentile,x$statements_with_runtimes_in_95th_percentile	Statements with highest average runtime
statements_with_sorting, x$statements_with_sorting	Statements that performed sorts
statements_with_temp_tables, x$statements_with_temp_tables	Statements that used temporary tables
user_summary, x$user_summary	User statement 和 connection activity
user_summary_by_file_io, x$user_summary_by_file_io	File I/O, grouped by user
user_summary_by_file_io_type, x$user_summary_by_file_io_type	File I/O, grouped by user 和 event
user_summary_by_stages, x$user_summary_by_stages	Stage events, grouped by user
user_summary_by_statement_latency, x$user_summary_by_statement_latency	Statement statistics, grouped by user
user_summary_by_statement_type, x$user_summary_by_statement_type	Statements executed, grouped by user 和 statement
version	Current sys schema 和 MySQL server versions
wait_classes_global_by_avg_latency, x$wait_classes_global_by_avg_latency	Wait class average latency, grouped by event class
wait_classes_global_by_latency, x$wait_classes_global_by_latency	Wait class total latency, grouped by event class
waits_by_host_by_latency, x$waits_by_host_by_latency	Wait events, grouped by host 和 event
waits_by_user_by_latency, x$waits_by_user_by_latency	Wait events, grouped by user 和 event
waits_global_by_latency, x$waits_global_by_latency	Wait events, grouped by event
x$ps_digest_95th_percentile_by_avg_us	Helper view for 95th-percentile views
x$ps_digest_avg_latency_distribution	Helper view for 95th-percentile views
x$ps_schema_table_statistics_io	Helper view for table-statistics views
x$schema_flattened_keys	Helper view for schema_redundant_indexes

Table 24.3 sys Schema Stored Procedures

Procedure Name	Description
create_synonym_db()	Create synonym for schema
diagnostics()	Collect system diagnostic information
execute_prepared_stmt()	Execute prepared statement
ps_setup_disable_background_threads()	Disable background thread instrumentation
ps_setup_disable_consumer()	Disable consumers
ps_setup_disable_instrument()	Disable instruments
ps_setup_disable_thread()	Disable instrumentation for thread
ps_setup_enable_background_threads()	Enable background thread instrumentation
ps_setup_enable_consumer()	Enable consumers
ps_setup_enable_instrument()	Enable instruments
ps_setup_enable_thread()	Enable instrumentation for thread
ps_setup_reload_saved()	Reload saved Performance Schema configuration
ps_setup_reset_to_default()	Reset saved Performance Schema configuration
ps_setup_save()	Save Performance Schema configuration
ps_setup_show_disabled()	Display disabled Performance Schema configuration
ps_setup_show_disabled_consumers()	Display disabled Performance Schema consumers
ps_setup_show_disabled_instruments()	Display disabled Performance Schema instruments
ps_setup_show_enabled()	Display enabled Performance Schema configuration
ps_setup_show_enabled_consumers()	Display enabled Performance Schema consumers
ps_setup_show_enabled_instruments()	Display enabled Performance Schema instruments
ps_statement_avg_latency_histogram()	Display statement latency histogram
ps_trace_statement_digest()	Trace Performance Schema instrumentation for digest
ps_trace_thread()	Dump Performance Schema data for thread
ps_truncate_all_tables()	Truncate Performance Schema summary tables
statement_performance_analyzer()	Report of statements running on server
table_exists()	Whether a table exists

Table 24.4 sys Schema Stored Functions

Function Name	Description
extract_schema_from_file_name()	Extract schema name from file path name
extract_table_from_file_name()	Extract table name from file path name
format_bytes()	Convert byte value to value with units
format_path()	Replace data 和 temp-file directories in path name with symbolic values
format_statement()	Truncate long statement to fixed length
format_time()	Convert picoseconds value to value with units
list_add()	Add item to list
list_drop()	Remove item from list
ps_is_account_enabled()	Check whether account instrumentation is enabled
ps_is_consumer_enabled()	Check whether consumer is enabled
ps_is_instrument_default_enabled()	Check whether instrument is enabled
ps_is_instrument_default_timed()	Check whether instrument is timed
ps_is_thread_instrumented()	Check whether thread is instrumented
ps_thread_account()	Return account for thread ID
ps_thread_id()	Return thread ID for connection ID
ps_thread_stack()	Return event information for thread ID
ps_thread_trx_info()	Return transaction information for thread ID
quote_identifier()	Return string as quoted identifier
sys_get_config()	Return sys schema configuration option
version_major()	MySQL server major version number
version_minor()	MySQL server minor version number
version_patch()	MySQL server patch release version number

24.4.2 sys框架的表和触发器

24.4.2.1 sys_config

Sys_config表列：

· Variable:配置选项

· value：选项的值

· set_time：最近一次修改时间。

· set_by:最近一次修改用户

为了最小化直接读取sys_config表的影响，sys框架下的函数用来检查用户定义的变量和相关的名字，这个名字使用变量以@sys.为前缀。如果当前会话有用户定义的变量部位null，那么就优先使用变量上的长度。否则就读取表上的值：

mysql> SET @stmt = 'SELECT variable, value, set_time, set_by FROM sys_config';

mysql> SELECT format_statement(@stmt);

+----------------------------------------------------------+

| format_statement(@stmt) |

+----------------------------------------------------------+

| SELECT variable, value, set_time, set_by FROM sys_config |

+----------------------------------------------------------+

mysql> SET @sys.statement_truncate_len = 32;

mysql> SELECT format_statement(@stmt);

+-----------------------------------+

| format_statement(@stmt) |

+-----------------------------------+

| SELECT variabl ... ROM sys_config |

+-----------------------------------+

之后会话中的会继续使用变量的32，而不是使用表里面的64。

为了停止变量的使用可以使用以下语句，取消或者关闭当前会话：

mysql> SET @sys.statement_truncate_len = NULL;

mysql> SELECT format_statement(@stmt);

+----------------------------------------------------------+

| format_statement(@stmt) |

+----------------------------------------------------------+

| SELECT variable, value, set_time, set_by FROM sys_config |

变量可以在会话结束前生效，如果sys_config在会话中被修改，这个修改不会体现在会话上，除非会话结束。

Sys_config和变量的配置值：

· diagnostics.all_i_s_tables, @sys.diagnostics.all_i_s_tables
如果选项为on，diagnostics()过程允许对information_schema.tables表进行扫描。如果表很多这个操作花费就比较大。

· diagnostics.include_raw,@sys. diagnostics.include_raw
如果选项为on，diagnostics()过程包含了metrics视图输出的原生数据。默认为off。

· ps_thread_trx_info.max_length,@sys. ps_thread_trx_info.max_length
ps_thread_trx_info()函数输出的最大json的长度。

· statement_performance_analyzer.limit,@sys.statement_performance_analyzer.limit
视图返回的最大行数，编译没有限制。最大为100.

· statement_performance_analyzer.view,@sys.statement_performance_analyzer.view
statement_performance_analyzer()过程使用到的视图和查询。如果选项值包含了空间就表示是一个查询，否则必须是events_statements_summary_by_digest表上的视图。如果上面的limit>0就不能有limit子句。默认我null。

· statement_truncate_len, @sys.statement_truncate_len
format_statement()函数返回的最大语句长度，长的语句会被截断，默认64.

其他选项可以通过sys_config表添加。比如diagnostics(),execute_prepared_stmt()的调试选项，但是不是sys_config的默认有的选项：

mysql> INSERT INTO sys_config (variable, value) VALUES('debug', 'ON');

修改debug信息：

mysql> UPDATE sys_config SET value = 'OFF' WHERE variable = 'debug';

mysql> SET @sys.debug = NULL;

24.4.3 性能框架视图

· host_summary 和 x$host_summary Views
视图显示了语句活动，文件io和连接信息，由host分组

· host_summary_by_file_io 和 x$host_summary_by_file_io Views
视图总计了文件io，由host分组

· host_summary_by_file_io_type 和 x$host_summary_by_file_io_type Views
视图总计了文件io，由host和event类型分组。

· host_summary_by_stages 和 x$host_summary_by_stages Views
总计语句stage，由host分组

· host_summary_by_statement_latency 和 x$host_summary_by_statement_latency Views
总计语句的统计信息,由host分组

· host_summary_by_statement_type 和 x$host_summary_by_statement_type Views
总计语句的执行，由host和语句类型分组

· innodb_buffer_stats_by_schema 和 x$innodb_buffer_stats_by_schema Views
统计information_schema.innodb_buffer_page,由schema分组，object_schema为对象的schema，如果为innodb表属于innodb system。

· innodb_buffer_stats_by_table 和 x$innodb_buffer_stats_by_table Views
统计information_schema.innodb_buffer_page,由表名分组。

· innodb_lock_waits 和 x$innodb_lock_waits Views
总计了innodb锁等待。列如下：
wait_started：等待开始事件。
wait_age:等待锁的时间长度。
wait_age_secs:等待了多少秒。
locked_table：被锁定的表。
locked_index：被锁的索引
locked_type:锁等待类型
waiting_trx_started:等待事务的开始事件。
waiting_trx_age：等待事务等待时间。
waiting_trx_rows_locked:等待事务锁定的行锁个数。
……

· io_by_thread_by_latency 和 x$io_by_thread_by_latency Views
总计了IO消费者显示了线程的IO等待。

· io_global_by_file_by_bytes 和 x$io_global_by_file_by_bytes Views
总计了IO消费者显示每个文件的读写量，由文件分组

· io_global_by_file_by_latency 和 x$io_global_by_file_by_latency Views
总结io消费者显示io次数和延迟事件，由文件分组

· io_global_by_wait_by_bytes 和 x$io_global_by_wait_by_bytes Views
每个event的总io字节。

· io_global_by_wait_by_latency 和 x$io_global_by_wait_by_latency Views
每个event的总io次数和io等待时间

· latest_file_io 和 x$latest_file_io Views
总计活动的文件IO，由文件和线程分组。

· memory_by_host_by_current_bytes 和 x$memory_by_host_by_current_bytes Views
总计host使用的总内存

· memory_by_thread_by_current_bytes 和 x$memory_by_thread_by_current_bytes Views
线程的内存使用

· memory_by_user_by_current_bytes 和 x$memory_by_user_by_current_bytes Views
总计用户使用的内存

· memory_global_by_current_bytes 和 x$memory_global_by_current_bytes Views
每个分配类型分配的内存

· memory_global_total 和 x$memory_global_total Views
服务的总内存使用

· metrics View
视图总计mysql服务的指标，显示变量名，变量值，类型和他们的启动情况。视图在mysql 5.7.9被添加，视图主要包含信息：

o 全局的状态变量，来至于global_status表。

o 来自information_schema.global_status.Innodb指标

o 当前和所有内存分配

o 当前时间

有一些在global_status和innodb_status中有重复的指标，metrics视图会进行消除。

· processlist 和 x$processlist Views
比show processlist返回的信息更加详细

· ps_check_lost_instrumentation View
返回丢失的性能框架记录点，显示是否性能框架可以跟踪所有数据。

· schema_auto_increment_columns View
视图显示了有auto_increment的列，并且提供了有用的信息。

· schema_index_statistics 和 x$schema_index_statistics Views
视图提供的所有统计信息

· schema_object_overview View
schema下对象统计

· schema_redundant_indexes 和 x$schema_flattened_keys Views
显示了冗余的索引

· schema_table_lock_waits 和 x$schema_table_lock_waits Views
显示了哪些会话被元数据锁锁定，什么锁定了它们

· schema_table_statistics 和 x$schema_table_statistics Views
表操作的统计，io和延迟的统计

· schema_table_statistics_with_buffer 和 x$schema_table_statistics_with_buffer Views
表操作的统计，io和延迟的统计，和内存的分配

· schema_tables_with_full_table_scans 和 x$schema_tables_with_full_table_scans Views
显示了哪些表被表扫描访问

· schema_unused_indexes View
未使用过的索引

· session 和 x$session Views
和processlist相似但是不显示后台进程

· session_ssl_status View
对于每个连接显示SSL版本，chipher和count

· statement_analysis 和 x$statement_analysis Views
显示了语句的执行情况，执行次数，响应行数，延迟等

· statements_with_errors_or_warnings 和 x$statements_with_errors_or_warnings Views
语句的错误或者警告

· statements_with_full_table_scans 和 x$statements_with_full_table_scans Views
用到了表扫描的语句

· statements_with_runtimes_in_95th_percentile和 x$statements_with_runtimes_in_95th_percentile Views
runtimes在95%以内的语句

· statements_with_sorting 和 x$statements_with_sorting Views
执行了排序的语句

· statements_with_temp_tables 和 x$statements_with_temp_tables Views
使用了临时表的语句

· user_summary 和 x$user_summary Views
用户总计信息，包含语句，文件io，连接

· user_summary_by_file_io 和 x$user_summary_by_file_io Views
用户文件io总计

· user_summary_by_file_io_type 和 x$user_summary_by_file_io_type Views
用户文件io类型总计

· user_summary_by_stages 和 x$user_summary_by_stages Views
用户stage事件总计

· user_summary_by_statement_latency 和 x$user_summary_by_statement_latency Views
用户在执行语句上的延迟

· user_summary_by_statement_type 和 x$user_summary_by_statement_type Views
用户在语句类型上的延迟

· version View
版本

· wait_classes_global_by_avg_latency 和 x$wait_classes_global_by_avg_latency Views
等待类型延迟汇总，由平均延迟排序

· wait_classes_global_by_latency 和 x$wait_classes_global_by_latency Views
等待类型延迟汇总，由总延迟排序

· waits_by_host_by_latency 和 x$waits_by_host_by_latency Views
host，等待事件延迟汇总

· waits_by_user_by_latency 和 x$waits_by_user_by_latency Views
用户等待事件延迟

· waits_global_by_latency 和 x$waits_global_by_latency Views
等待事件延迟。

24.4.4 sys框架存储过程

· The create_synonym_db() Procedure
创建一个别名数据库，指向被引用的数据库，使用视图指向被引用数据库的表

· The diagnostics() Procedure
当前服务器的状态，包含了mysql服务版本信息，系统变量，innodb状态，processlist，内存使用信息，performance_schema状态，和一些状态信息。输出到diag.out文件

mysql> tee diag.out;

mysql> CALL diagnostics(120, 30, 'current');

mysql> notee;

· The execute_prepared_stmt() Procedure
以已准备好的语句，来执行。准备好的语句在执行完成后被释放，所以并不能重用。可以用来执行的动态语句。

· The ps_setup_disable_background_threads() Procedure
禁止后台进程的所有性能框架记录点

· The ps_setup_disable_consumer() Procedure
禁用某个消费者

· The ps_setup_disable_instrument() Procedure
禁用记录点

· The ps_setup_disable_thread() Procedure
根据连接id，禁用某个线程

· The ps_setup_enable_background_threads() Procedure
启动后台线程的性能框架记录

· The ps_setup_enable_consumer() Procedure
启动某个性能框架消费者

· The ps_setup_enable_instrument() Procedure
启动某个性能框架记录点

· The ps_setup_enable_thread() Procedure
启动某个连接id对应线程的记录点

· The ps_setup_reload_saved() Procedure
重新加载性能框架配置，使用之前ps_setup_save保存的配置

· The ps_setup_reset_to_default() Procedure
重置到默认配置

· The ps_setup_save() Procedure
保存性能框架配置，这样可以根据调试要求先调整，然后恢复

· The ps_setup_show_disabled() Procedure
显示当前所有禁用的配置

· The ps_setup_show_disabled_consumers() Procedure
显示所有禁用的消费者

· The ps_setup_show_disabled_instruments() Procedure
显示禁用的记录点

· The ps_setup_show_enabled() Procedure
显示启动的性能框架配置

· The ps_setup_show_enabled_consumers() Procedure
显示启动的消费者

· The ps_setup_show_enabled_instruments() Procedure
显示启动的记录点

· The ps_statement_avg_latency_histogram() Procedure
直方图显示语句的平均延迟

· The ps_trace_statement_digest() Procedure
跟踪指定语句digest的所有性能记录点。

· The ps_trace_thread() Procedure
指定连接id的所有性能记录点

· The ps_truncate_all_tables() Procedure
清空所有性能框架summary表

· The statement_performance_analyzer() Procedure
创建语句在服务端上运行的报表

· The table_exists() Procedure
判断是否存在表，视图，临时表

24.4.5 sys框架存储函数

The extract_schema_from_file_name() Function
根据文件路径获取对应的数据库名

The extract_table_from_file_name() Function
根据文件路径获取表名

The format_bytes() Function
给字节数，转化为可读的格式

The format_path() Function
文件路径格式化

The format_statement() Function
格式化语句输出，输出长度和statement_truncate_len配置有关。

The format_time() Function
时间格式化

The list_add() Function
增加一个由逗号隔开的队列中。

The list_drop() Function
从逗号隔开的队列的队列中删除一个元素

The ps_is_account_enabled() Function
判断账号是否启动

The ps_is_consumer_enabled() Function
判断消费者是否启动

The ps_is_instrument_default_enabled() Function
判断记录点是否默认启动

The ps_is_instrument_default_timed() Function
给定记录点默认是否是被计时的。

The ps_is_thread_instrumented() Function
判断连接id对应的性能框架记录点启动

The ps_thread_account() Function
给定连接id，判断线程启动的用户。

The ps_thread_id() Function
给定连接id返回线程id

The ps_thread_stack() Function
给定线程id，返回json格式的语句，stages，events的stack

The ps_thread_trx_info() Function
返回线程id的事务和已经执行的语句

The quote_identifier() Function
引用分隔符

The sys_get_config() Function
获取sys_config表的数据

The version_major() Function
mysql主版本

The version_minor() Function
mysql次版本

The version_patch() Function
mysql补丁号

posted on 2016-08-07 20:34 Fanr_Zh 阅读(621) 评论(0) 编辑收藏举报

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