29. What Makes a True Leader ? 合格的领导者由何物决定 ? ① Reading leadership literature,you'd sometimes think that everyone has the potential to be an effective leader. ② I don't believe that to be true.In fact,I see way fewer truly effective leaders than I see…
解Bug之路-ZooKeeper集群拒绝服务 前言 ZooKeeper作为dubbo的注册中心,可谓是重中之重,线上ZK的任何风吹草动都会牵动心弦.最近笔者就碰到线上ZK Leader宕机后,选主无法成功导致ZK集群拒绝服务的现象,于是把这个case写出来分享给大家(基于ZooKeeper 3.4.5). Bug现场 一天早上,突然接到电话,说是ZooKeeper物理机宕机了,而剩余几台机器状态都是 sh zkServer.sh status it is probably not running…
QUESTION 13 View the Exhibit.Examine the following command that is executed for the TRANSPORT table in the SH schema:SQL> SELECT DBMS_STATS.CREATE_EXTENDED_STATS('sh', 'customers_obe', '(country_id,cust_state_province)') FROM dual;Which statement des…
5.1 Object 类型 对象是引用类型的实例.引用类型是一种数据结构,用于将数据和功能组织在一起. 新对象是使用new操作符后跟一个构造函数来创建的.构造函数本身就是一个函数,只不过该函数是出于创建新对象的目的而定义的.示例1: var person = new Object(); 分析:这行代码创建了Object引用类型的一个新实例,然后把该实例保存在了变量person中.使用的构造函数是Object,它为新对象定义了默认的属性和方法. Object类型是ECMAScript中使用最多的类…