ppt修改点

1.关于innodb的聚簇索引的说明，下面这段话应该比manul更权威：Data rows are stored in the B-tree leaf nodes of a clustered index。 B-tree is organized by primary key or non-null unique key of table, if defined;
else, an internal column with 6-byte ROW_ID is added. 这段话来www.innodb.com出品的一个ppt

 

2.MySQL QueryCache原理经典讲解