InnoDB表对象的限制条件
当系统变量innodb_table_locks=1时，LOCK TABLES会在表上持有两个锁，一个是MySQL层持有的锁，另外InnoDB层也需要持有一个锁,Inn
InnoDB表对象的限制条件：
最大和最小
InnoDB日志文件最大不超过512G
InnoDB系统表空间最少需要10M空间
默认数据库中数据页的大小为16K
ANALYZE TABLE语句收集统计信息不是特别准确，，
SHOW TABLE STATUS语句不能列出InnoDB表的实际统计数据，记录行数、平均记录长度等信息都仅是预估值
SELECT COUNT(*) FROM TBL语句时，InnoDB必须检索全表，MySQL建议对于InnoDB引擎表的这类需求，考虑通过创建中间表专门记录表行数方式来处理
对于AUTO_INCREMENT列，建议创建单列索引
DELETE FROM TBL并非重建表，而是逐条删记录
当系统变量innodb_table_locks=1时，LOCK TABLES会在表上持有两个锁，一个是MySQL层持有的锁，另外InnoDB层也需要持有一个锁
InnoDB引擎在事务中持有的锁会在事务提交或回滚时释放，因此当autocommit=1时执行LOCK TABLE没有意义，因为持有的锁会马上释放
MySQL innoDB 存储引擎学习篇
MySQL InnoDB存储引擎锁机制实验
InnoDB存储引擎的启动、关闭与恢复
MySQL InnoDB独立表空间的配置
MySQL Server 层和 InnoDB 引擎层 体系结构图
InnoDB 死锁案例解析
MySQL Innodb独立表空间的配置
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