MongoDB索引介绍

一、Single Field Indexes

示例文档：

{
"_id": Id("570c04a4ad233577f97dc459"),
"score": 1034,
"location": { state: "NY", city: "New York" }
}

1、语法：

db.records.createIndex( { score: 1 } )

2、在嵌套字段上创建索引

db.records.createIndex( { "location.state": 1 } )

查询语法：

db.records.find( { "location.state": "CA" } )
db.records.find( { "location.city": "Albany", "location.state": "NY"