Returns the list of collections in the database we connect to. Returns all records in the people collection. In the customer database, it adds a record to the collection named people, and creates it if there is no collection. It shows the database to which we are connected. If we leave the database without creating an object, the database will be deleted. It connects to a database named customer, it creates if there is no database with that name. Let’s create a new database and collection and add records with the following commands: Mongo - port 27017 - host 127.0.0.1 - authenticationDatabase "admin" - u zaydemir - p 'mypassword' We connect to the admin database with the following command and create an authorized user in the entire cluster: Create admin user in MongoDB: Create User in MongoDB and MongoDB Database Operations “WARNING: / sys / kernel / mm / transparent_hugepage / enabled is ‘always’.”Īfter creating users in the database, we will change this setting as recommended. This is the reason for the warning you see in the command output below. This setting is enabled by default on most Linux distributions. MongoDB recommends disabling Transparent HugePages for better performance. We will not receive this warning when we create an authorized user in the database, enable the authentication setting in the default configuration file “/etc/nf” and restart the service. “WARNING: Access control is not enabled for the database.” config database in MongoDBīy default, the authentication setting is set to disable when MongoDB service is installed. It is also not copied during replication processes. local database in MongoDBĬontains information of MongoDB service in replication processes. There are also some service-wide commands that can only be run from the admin database, such as listing all databases or shutting down the service. If a user is added to the admin database, the user automatically inherits the permissions of all databases. The root database for administrative operations.
MongoDB has admin, local and config databases by default. With the show dbs command, we can view the existing databases:
#INSTALL MONGODB CENTOS 6.7 INSTALL#
Install MongoDB on Centos 8įor the installation, we create the “/etc//mongodb-org-4.2.repo” repo file with the vim command and add the following lines into the file, save and exit: We will install MongoDB on CentOS 8 server. We can think of the document as a row in relational databases. There can be more than one document in a collection. Collections are similar to the concept of tables in relational databases however, these are schematic. So documents can have different schemes, which means that the scheme can change as the application evolves.Ī single MongoDB instance can host multiple databases. MongoDB does not have table, row and column concepts. In order to achieve high performance in MongoDB, some features commonly found in RDBMS systems are not available in MongoDB. MongoDB provides ACID support in 4.0 and later versions. Stores data as Binary JSON documents (BSON). db.MongoDB is an open source and document-based NoSQL database designed to efficiently process large amounts of data.
I have a fresh install of CentOS 6.6 and installed MongoDB 3.0.6 as per the instructions here.
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