Mongodb的索引操作

IT之一小佬发布时间：2021-02-08 11:54:52 ，浏览量：2

Mongodb的索引操作 1. 为什么mongdb需要创建索引

加快查询速度
进行数据的去重

2. mongodb创建简单的索引方法

语法：db.集合名.ensureIndex({属性:1})，1表示升序， -1表示降序

3. 创建索引前后查询速度对比

测试：插入10万条数据到数据库中

插入数据：

for(i=0;i


    
        
        
        
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