mongodb ensureindex

Original link http://www.cnblogs.com/zhangzili/p/4975080.htmlMongoDB knowledge points at a glance1. Start the MongoDB database:Go to the MongoDB installation directory and execute the following commandC:\Program

Copy Code code as follows: /** * PHP Operation MongoDB Learning Notes */ //************************* * * Connect MongoDB database **// //************************* Format => ("mongodb://Username: password @ address: Port/default

********************************** Connect to the MongoDB database * * ************************* format ("mongodb: username: password @ address: Specifies the database by default on the port ", parameter) $ connnewMongo (); can be abbreviated as $

Common query indexes of mongoDB (III)1. _ id index is the default index created by the vast majority of sets. For each inserted data, MongoDB automatically generates a unique _ id field. > Db. jerome_2.collection.insert ({x: 2}) WriteResult

MongoDB, as the first database in NoSQL, has been using more and more people in recent years, and as a developer, it is necessary to understand the next MongoDB database. The following will give you the basic knowledge of the MongoDB database, there

MongoDB Study Notes (INDEX) Postedon I. indexing basics: MongoDB indexes are almost the same as traditional relational databases, which also include some basic optimization techniques. The following command creates an index: db. test. ensureIndex

/*** MongoDB $type operator*/ /*** The $type operator is based on the Bson type to retrieve the matching data type in the collection and returns the result.* The types of MongoDB that can be used are shown in the following table:* Type Number Notes*

0) MONGO: Connect MongoDB database via client1) Show DBS---Display the currently created database2) Use test---Create or switch databases3) Db.dropdatabase ()--Delete the current database3) Show Collections: Displays the collection created by the

Install MongoDB 3.0 server on CentOS71. Download and install MongoDB 3.0 official version released! This marks a new development stage for MongoDB databases, providing a powerful, flexible, and easy-to-manage database management system. MongoDB

It has been nearly a year since I came into contact with mongodb, And I have accumulated a lot of experience in indexing it. On this dark night, I would like to summarize the mongodb index. I. Index description mongodb has two types of indexes: