当我们想了解当前mysql连接情况,分析其运行状态,那该如何查看呢?
登录mysql数据库后,
show status();
会发现其中有一向【query】
此query查询栏目,表示当前时间发生过的查询次数,要想知道一段时间的查询次数,查询两次做差即可。
当前query - 10分钟后的query = 此十分钟的查询数
再往下 有【Threads】相关栏目
1.Threads_connected:当前线程连接个数
2.Threads_running: 当前进程运行个数
3.Threads_cached:已经被线程缓存池缓存的线程个数
4.Threads_created:表示创建过的线程数,如果发现Threads_created值过大的话,表明MySQL服务器一直在创建线程,这也是比较耗资源,可以适当增加配置文件中thread_cache_size值
show variables like 'thread_cache_size';
AWK用法:
awk '/匹配正则/{printf("%d\n",$1)}' file_name.txt //匹配txt文件里的第一列($1)的信息
awk '正则/{处理方式}/正则/{处理方式}'
举例:
mysqladmin -uroot -p ext //效果等同于===>show status()
1.使用awk查询当前mysql查询条数:
mysqladmin -uroot -p ext |awk '/Queries/{printf("%d\n",$4)}' mysqladmin -uroot -p ext |awk '/Queries/{a=$4}END{printf("%d",a)}' //另一种写法
2.使用awk查询多条列的信息:
mysqladmin -uroot -p ext |awk '/Queries/{printf("%d\n",$4)}/Threads_connected/{printf("%d\n",$4)}/Threads_running/{printf("%d\n",$4)}' mysqladmin -uroot -p ext |awk '/Queries/{a=$4}/Threads_connected/{b=$4}/Threads_running/{c=$4}END{printf("%d %d %d\n",a,b,c)}'
以上就是Mysql分析-awk+Threads分析状态 的内容,更多相关内容请关注PHP中文网(www.php.cn)!

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MySQL is suitable for beginners because: 1) easy to install and configure, 2) rich learning resources, 3) intuitive SQL syntax, 4) powerful tool support. Nevertheless, beginners need to overcome challenges such as database design, query optimization, security management, and data backup.

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MySQL is not only a database management system (DBMS) but also closely related to programming languages. 1) As a DBMS, MySQL is used to store, organize and retrieve data, and optimizing indexes can improve query performance. 2) Combining SQL with programming languages, embedded in Python, using ORM tools such as SQLAlchemy can simplify operations. 3) Performance optimization includes indexing, querying, caching, library and table division and transaction management.

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