Concentration inequalities under sub-Gaussian and sub-exponential conditions sub-guassian范数和sub-exponential范数: 如果 f k ( X ) f_{k}(X) fk(X)为sub-gaussian随机变量,则有如下的定理: 应用: 1.向量值集中 2.…
一、不常见的索引失效场景
1、举例
还是之前的member会员记录表,往里面插入十万条数据
drop procedure if exists insert_emp;
CREATE PROCEDURE insert_emp () BEGINDECLAREi INT;SET i 1;WHILE( i < 100000 ) DOINSERT INTO member ( NAME, age, address, …