MongoDB learning-Continuous updates and continuous mongodb Learning

MongoDB learning-Continuous updates and continuous mongodb Learning

Refer to the MongoDB authoritative guide for more information and updates in this article.

Advantages of MongoDB

MongoDB has rich data models and is a document-oriented database.

It is easy to expand and data can be split between multiple servers. Developers only need to focus on writing applications. If you need more data, you only need to add new machines to the cluster and then let the database handle the rest.

It has rich functions, such as indexing, storing JavaScript, aggregation, fixed sets, and file storage. Join and complex multiline transactions are not supported.

Superior performance is the primary goal of MongoDB. The default storage engine uses memory ing files to deliver memory management to the operating system.

Simple management: MongoDB tries its best to allow the server to manage the database by itself. In addition to starting the database server, there is almost no necessary management operations. If the master server fails, it is automatically switched to the slave server.

Download and install MongoDB

First, go to the MongoDB official website and select the version to be downloaded based on the system model. Here we use centos 64-bit as an example.

# Download wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.0.4.tgz tar-zxvf mongodb-linux-x86_64-3.0.4.tgz mv mongodb-linux-x86_64-3.0.4/usr/local/mongodb cd/usr/local/mongodb mkdir db mkdir logs vim bin/mongodb. conf # Add the following content: dbpath =/usr/local/mongodb/db logpath =/usr/local/mongodb/logs/mongodb. log port = 27017 fork = true # rebind the mongodb configuration file address and access IP/usr/local/mongodb/bin/mongod -- bind_ip localhos T-f/usr/local/mongodb/bin/mongodb. conf # Start MongoDB/usr/local/mongodb/bin/mongod -- config/usr/local/mongodb/bin/mongodb. conf # test whether the shell mode of mongodb is enabled successfully./usr/local/mongodb/bin/mongo show dbs # If no exception exists, the installation and startup are successful.

Basic concepts of MongoDB

A document is the basic unit of data in MongoDB, and is very similar to a row in a relational database.

Similarly, a set can be seen as a table without a schema.

A single MongoDB instance can accommodate multiple independent databases, each of which has its own set and permissions.

MongoDB comes with an indirect but powerful JavaScript shell. This tool is very useful for managing MongoDB instances and operating data.

Each document has a special key "_ id", which is unique in the collection of documents.

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