MySQL表的锁等待
今天线上业务遇到一个问题，因为一张模拟自增序列的表被锁住，涉及该表的业务受到影响。 线上情况： 1、这个表只有一个id字段。
今天线上业务遇到一个问题，因为一张模拟自增序列的表被锁住，涉及该表的业务受到影响。
线上情况：
1、这个表只有一个id字段。
2、id字段为主键索引
3、该表只有一行数据，记录全局最大id
4、某业务存储过程操作会执行id+1操作，并获取当前id的值，插入到其他相关的表中一行数据
5、存储过程执行完毕，最后会commit
6、事物隔离级别为READ-COMMITTED
7、某业务thread 102336锁住该表，使用show processlist查看，进程102336处于sleep状态
8、偶尔会有其他tread 请求锁住该表，均等待超时
9、在kill掉进程102336以后，业务恢复正常
正常这个表是不会长期处于锁定状态的，为什么这个进程一直不释放锁资源，难以理解，正常情况下存储过程执行完毕以后，要么提交，要么发生异常退出并rollback。
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Ubuntu 14.04下安装MySQL
《MySQL权威指南(原书第2版)》清晰中文扫描版 PDF
Ubuntu 14.04 LTS 安装 LNMP Nginx\PHP5 (PHP-FPM)\MySQL
Ubuntu 14.04下搭建MySQL主从服务器
Ubuntu 12.04 LTS 构建高可用分布式 MySQL 集群
Ubuntu 12.04下源代码安装MySQL5.6以及Python-MySQLdb
MySQL-5.5.38通用二进制安装
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