超简单的qps统计方法(推荐)(qpso算法)

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统计最近N秒内的QPS值(包括每秒select，insert等值)

mysql> select variable_name,sum(per_sec) as qps from (select straight_join lower(gs0.variable_name) as variable_name, (gs1.variable_value - gs0.variable_value)/5 as per_sec from ( select variable_name ,variable_value from information_schema.global_status where variable_name in ('com_select','com_update','com_insert','com_replace','com_delete') union all select '',sleep(5) from dual ) as gs0 join information_schema.global_status gs1 using (variable_name)) t group by variable_name with rollup;

+---------------+---------+| variable_name | qps |+---------------+---------+| com_delete | 0 || com_insert | 2.2 || com_replace | 0 || com_select | .8 || com_update | 3 || NULL | |+---------------+---------+6 rows in set (5. sec)

统计db启动以来的qps值，慢查询数量等信息

mysql> s--------------mysql Ver . Distrib 5.5., for Linux (x_) using readline 5.1Connection id: Current database: udbCurrent user: ucloud@..0.SSL: Not in useCurrent pager: stdoutUsing outfile: ''Using delimiter: ;Server version: 5.5.-log MySQL Community Server (GPL) by RemiProtocol version: Connection: ..9. via TCP/IPServer characterset: utf8Db characterset: utf8Client characterset: utf8Conn. characterset: utf8TCP port: Uptime: days 1 hour min secThreads: Questions: Slow queries: Opens: Flush tables: Open tables: Queries per second avg: .

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老生常谈mysql event事件调度器(必看篇) 概述MySQL也有自己的事件调度器，简单地可以理解为linux的crontabjob，不过对于SQL应用来说，它的功能更齐全，也更易于维护。个人感觉如果数量创建太多

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浅谈innodb的索引页结构,插入缓冲,自适应哈希索引 PhysicalStructureofanInnoDBIndex所有的innodb索引都是btree索引，索引记录保存在叶子上，默认的索引页大小是K。当有新的记录插入时，innodb出于对将来的insert

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