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《Mysql应用mysql 显示SQL语句执行时间的代码》要点：
本文介绍了Mysql应用mysql 显示SQL语句执行时间的代码，希望对您有用。如果有疑问，可以联系我们。
MYSQL必读MySQL 的 SQL Z法{整主要都是使用 EXPLAIN,但是@K]k法知道的 Ram(Memory)/CPU 等使用量.
MYSQL必读於 MySQL 5.0.37 以上_始支援 MySQL Query Profiler,可以查到此 SQL 绦卸嗌rg,K看出 CPU/Memory 使用量,绦羞^程中 System lock,Table lock 花多少rg等等.
MYSQL必读MySQL Query Profile 介B可: Using the New MySQL Query Profiler (2007.04.05 l表)
MYSQL必读效能分析主要分下述三N(Dd自上篇):
MYSQL必读Bottleneck analysis - focuses on answering the questions: What is my database server waiting on; what is a user connection waiting on; what is a piece of SQL code waiting on?
Workload analysis - examines the server and who is logged on to determine the resource usage and activity of each.
Ratio-based analysis - utilizes a number of rule-of-thumb ratios to gauge performance of a database,user connection,or piece of code.
MySQL Query Profile 使用方法
mysql> set profiling=1; # 此命令於 MySQL information_schema 的 database 建立一 PROFILING 的 table 砑o.
SQL profiles show
mysql> show profiles; # 又崴姓Z法及使用rg,含e`Z法都o.
ex: (root@localhost) [test]> show profiles; # 注意 Query_ID,下面绦rgy等,都是依 Query_ID 在o
MYSQL必读?+----------+------------+---------------------------+
?| Query_ID | Duration?? | Query???????????????????? |
?+----------+------------+---------------------------+
?|??????? 1 | 0.00090400 | show profile for query 1? |
?|??????? 2 | 0.00008700 | select * from users?????? |
?|??????? 3 | 0.00183800 | show tables?????????????? |
?|??????? 4 | 0.00027600 | mysql> show profiles????? |
?+----------+------------+---------------------------+
?查所有花Mrg加
mysql> select sum(duration) from information_schema.profiling where query_id=1; # Query ID = 1
MYSQL必读?+---------------+
?| sum(duration) |
?+---------------+
?|????? 0.000447 |
?+---------------+
?查各绦须A段花M多少rg
mysql> show profile for query 1; # Query ID = 1
MYSQL必读?+--------------------+------------+
?| Status???????????? | Duration?? |
?+--------------------+------------+
?| (initialization)?? | 0.00006300 |
?| Opening tables???? | 0.00001400 |
?| System lock??????? | 0.00000600 |
?| Table lock???????? | 0.00001000 |
?| init?????????????? | 0.00002200 |
?| optimizing???????? | 0.00001100 |
?| statistics???????? | 0.00009300 |
?| preparing????????? | 0.00001700 |
?| executing????????? | 0.00000700 |
?| Sending data?????? | 0.00016800 |
?| end??????????????? | 0.00000700 |
?| query end????????? | 0.00000500 |
?| freeing items????? | 0.00001200 |
?| closing tables???? | 0.00000800 |
?| logging slow query | 0.00000400 |
?+--------------------+------------+
?查各绦须A段花M的各NY源列表
mysql> show profile cpu for query 1; # Query ID = 1
MYSQL必读?+--------------------------------+----------+----------+------------+
?| Status???????????????????????? | Duration | CPU_user | CPU_system |
?+--------------------------------+----------+----------+------------+
?| (initialization)?????????????? | 0.000007 | 0??????? | 0????????? |
?| checking query cache for query | 0.000071 | 0??????? | 0????????? |
?| Opening tables???????????????? | 0.000024 | 0??????? | 0????????? |
?| System lock??????????????????? | 0.000014 | 0??????? | 0????????? |
?| Table lock???????????????????? | 0.000055 | 0.001??? | 0????????? |
?| init?????????????????????????? | 0.000036 | 0??????? | 0????????? |
?| optimizing???????????????????? | 0.000013 | 0??????? | 0????????? |
?| statistics???????????????????? | 0.000021 | 0??????? | 0????????? |
?| preparing????????????????????? | 0.00002? | 0??????? | 0????????? |
?| executing????????????????????? | 0.00001? | 0??????? | 0????????? |
?| Sending data?????????????????? | 0.015072 | 0.011998 | 0????????? |
?| end??????????????????????????? | 0.000021 | 0??????? | 0????????? |
?| query end????????????????????? | 0.000011 | 0??????? | 0????????? |
?| storing result in query cache? | 0.00001? | 0??????? | 0????????? |
?| freeing items????????????????? | 0.000018 | 0??????? | 0????????? |
?| closing tables???????????????? | 0.000019 | 0??????? | 0????????? |
?| logging slow query???????????? | 0.000009 | 0??????? | 0????????? |
?+--------------------------------+----------+----------+------------+
?mysql> show profile IPC for query 1;
MYSQL必读?+--------------------------------+----------+---------------+-------------------+
?| Status???????????????????????? | Duration | Messages_sent | Messages_received |
?+--------------------------------+----------+---------------+-------------------+
?| (initialization)?????????????? | 0.000007 |???????????? 0 |???????????????? 0 |
?| checking query cache for query | 0.000071 |???????????? 0 |???????????????? 0 |
?| Opening tables???????????????? | 0.000024 |???????????? 0 |???????????????? 0 |
?| System lock??????????????????? | 0.000014 |???????????? 0 |???????????????? 0 |
?| Table lock???????????????????? | 0.000055 |???????????? 0 |???????????????? 0 |
?| init?????????????????????????? | 0.000036 |???????????? 0 |???????????????? 0 |
?| optimizing???????????????????? | 0.000013 |???????????? 0 |???????????????? 0 |
?| statistics???????????????????? | 0.000021 |???????????? 0 |???????????????? 0 |
?| preparing????????????????????? | 0.00002? |???????????? 0 |???????????????? 0 |
?| executing????????????????????? | 0.00001? |???????????? 0 |???????????????? 0 |
?| Sending data?????????????????? | 0.015072 |???????????? 0 |???????????????? 0 |
?| end??????????????????????????? | 0.000021 |???????????? 0 |???????????????? 0 |
?| query end????????????????????? | 0.000011 |???????????? 0 |???????????????? 0 |
?| storing result in query cache? | 0.00001? |???????????? 0 |???????????????? 0 |
?| freeing items????????????????? | 0.000018 |???????????? 0 |???????????????? 0 |
?| closing tables???????????????? | 0.000019 |???????????? 0 |???????????????? 0 |
?| logging slow query???????????? | 0.000009 |???????????? 0 |???????????????? 0 |
?+--------------------------------+----------+---------------+-------------------+
?其它傩粤斜
ALL - displays all information
BLOCK IO - displays counts for block input and output operations
CONTEXT SWITCHES - displays counts for voluntary and involuntary context switches
IPC - displays counts for messages sent and received
MEMORY - is not currently implemented
PAGE FAULTS - displays counts for major and minor page faults
SOURCE - displays the names of functions from the source code,together with the name and line number of the file in which the function occurs
SWAPS - displays swap counts
O定 Profiling 存的 Size
mysql> show variables where variable_name='profiling_history_size'; # AO是 15P
P]
mysql> set profiling=0; 编程之家PHP培训学院每天发布《Mysql应用mysql 显示SQL语句执行时间的代码》等实战技能，PHP、MYSQL、LINUX、APP、JS,CSS全面培养人才。 （编辑：李大同）
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