there are three existing servers (all mysql5.7 installed by centos7,): br 10.19.6.6 BRV 192.168.3.101 CRAV 192.168.3.102 use xtrabackup to back up A s MYSQL data, then restore to B A s database to deactivate, and B updates the primary database d...
problem description take over a new database, today found table data 50G, and then various indexes 75G, of which three large indexes are each around 23g, and most of the large indexes are bound to timestamps. what result do you expect? What is the e...
for example, in the master-slave replication architecture of mysql, SQL threads often fail to execute and lead to replication being stranded. I want to know how people generally deal with this situation ...
High performance MySQL (3rd edition, 1st edition, May 2013) on page 390, it is mentioned that the current generation of RDBMS technology has been optimized for mechanical hard drives for decades, and the same mature and in-depth research work has not re...
function animal () { this.eat = function (){ console.log( i will eat ); } } Why can t it be executed with the method animal.eat (), but with an instance of var. Do not understand the principle animal.eat (); eat is not a function ...
In the vue project, using the radio box, v-model binds an array. When the array is empty, the radio box is still selected. <input type="radio" v-model="arr" > data() { return { arr: [] } } how to modify it, ...
read an article in ES6 today: var a = []; for (let i = 0; i < 10; iPP) { a[i] = function () { console.log(i); }; } a[6](); 6 The document says that in the above code, the variable I is declared by let, and the current I is only valid in ...
like this structure, click to switch tab style how to judge? html: <li v-for="(menu,n) in menus" :key="n""> <router-link :to="menu.sub? :menu.href" > {{menu.title}} data structure: .avtive { b...
eslint is installed globally and locally, and the project is generated with vue-cil. After entering the eslint fiel-- fix command, no error is reported, and the file is not repaired....