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Database

MongoDB

How to clear the console in MongoDB?

To clear the console in MongoDB, you can use either of the following two syntaxes. The first syntax is as follows, this is the usage of the keyboard shortcut - Ctrl+L After pressing the above keys, you can clear the console in MongoDB. The second syntax is as follows - cls To understand the above syntax, let us implement them one by one. Here is a snapshot of my console. Looking at the sample output above, the console has been cleared. Let's check the console again.

Sep 01, 2023 am 08:21 AM

How to update the _id of a MongoDB document?

You cannot update it, but you can save the new ID and delete the old ID. Please follow some steps to update MongoDB's _id. The steps are as follows: Step 1: In the first step, you need to store the ObjectId into a variable. anyVariableName=db.yourCollectionName.findOne({_id:yourObjectIdValue)}); Step 2: In the second step, you need to set a new id. yourDeclaredVariableName._id=yourNewObjectIdValue;Step 3: In the third step, you need to insert the new ID in the document. db.yourC

Aug 31, 2023 pm 10:29 PM

Install MongoDB Community Edition 4.0 on Linux

Introduction MongoDB is a popular open source NoSQL database management system known for its scalability, flexibility, and ease of use. If you are using a Linux operating system and wish to install MongoDB Community Edition 4.0, this article will provide you with a detailed guide with examples and corresponding command output. Prerequisites Before proceeding with the installation, make sure you meet the following prerequisites - Linux-based operating system (such as Ubuntu, CentOS or Debian). root or sudo permissions. Active internet connection. Step 1: Import the MongoDBGPG key To start the installation process, we first need to import the MongoDBGPG key

Aug 29, 2023 am 11:29 AM

Avoid duplicate entries in MongoDB?

To avoid duplicate entries in MongoDB, you can use createIndex(). The syntax is as follows - db.yourCollectionName.createIndex({"yourFieldName":1},{unique:true}); Let us implement the above syntax. The query to avoid duplicate entries in MongoDB is as follows ->db.avoidDuplicateEntriesDemo.createIndex({"UserName":1},{unique:true});{ &a

Aug 29, 2023 am 08:29 AM

What to do when MongoDB takes too long to look up records?

To reduce the time of finding records in MongoDB, you can use indexes. Following is the syntax - db.yourCollectionName.createIndex({yourFieldName:1}); You can follow the following method to create index for field name based on number, text, hash, etc. The first method lets us create an index. The following is the query->db.takeLessTimeToSearchDemo.createIndex({"EmployeeName":1});{ "createdCol

Aug 28, 2023 pm 09:21 PM

Best way to store date/time in MongoDB?

Date/time can be stored in MongoDB in two different ways. In the first approach, you can use the Date object just like JavaScript. Date objects are the best way to store date/time in MongoDB. The syntax is as follows: newDate(); In the second method, you can use ISODate(). The syntax is as follows: newISODate(); In order to understand the above syntax, let us follow the first method to create a collection containing documents. The query to create a collection using documents is as follows: The first method: >db.ProductsInformation.insertOne({"ProductId&

Aug 28, 2023 pm 06:57 PM

How to restart a NoSQL database service like MongoDB?

If we're going to use a NoSQL database for our application, then we need something fast and easy to use. We learned that "NoSQL" doesn't necessarily mean "no maintenance." We considered using a managed hosting service like MongoDB's Atlas or Amazon's DynamoDB, but we chose to host it ourselves, either on our premises or in our own cloud instance. We evaluated several NoSQL options, including Redis and Cassandra, and chose MongoDB. We can install it by installing from a Linux distribution, using Mongo’s repository, or using snap. But if something goes wrong, we may need to restart it. us

Aug 28, 2023 am 08:01 AM

How to install MongoDB on Ubuntu 16.04

MongoDB is a cross-platform, document-oriented database that provides high performance, high availability, and easy scalability. MongoDB is dedicated to the concepts of collections and documents. MongoDB maintainers have not yet released official Ubuntu 16.04 MongoDB packages. This article explains "How to install MongoDB on Ubuntu and start the MongoDB service at boot time" Adding MongoDB Repository MongoDB is usually included in the Ubuntu package repository. However, legitimate MongoDB repositories provide the latest version changes in an approved manner. To perform this process, we first have to import the key of the legitimate MongoDB repository using the following command - $sud

Aug 27, 2023 pm 10:13 PM

Show database in MongoDB

To display the number of databases in MongoDB, you need to create at least one document in the database. Suppose you have created a database but have not added any documents to it. Then that particular database will not be visible in the database list. Following is the query to create database->useapp;switchedtodbapp Here is the query to show all databases->showdbs;This will produce the following output. The new database "app" will not be visible because we have not added at least one document in it - admin

Aug 26, 2023 pm 08:45 PM

How to generate ObjectID in MongoDB?

To generate ObjectID, use the following syntax in MonogDBshell − newObjectId() Let us implement the above syntax to generate ObjectID in MongoDB −> newObjectId() ObjectId("5cd7bf2f6d78f205348bc646")>newObjectId()ObjectId("5cd7bf316d78f205348bc647")>newObjectId( )ObjectId(&

Aug 24, 2023 pm 12:01 PM

Connect MongoDB with NodeJS

mongodb.connect introduces this method for connecting the MongoDB server to our Node application. This is an asynchronous method in the MongoDB module. Syntax mongodb.connect(path[,callback]) Parameters • path – The server path and port where the MongoDB server is actually running. •callback – This function will provide a callback if any error occurs. Install Mongo-DB Before trying to connect the application with Nodejs, we first need to setup the MongoDB service

Aug 23, 2023 pm 06:21 PM

What are the mongodb startup commands?

The mongodb startup commands include mongod, mongod --config, mongod --fork, mongod --auth, mongod --replSet, mongod --shardsvr, mongod --configsvr, etc. Detailed introduction: 1. mongod, used to start the server process of MongoDB; 2. mongod --config specifies a configuration file to start MongoDB, etc.

Aug 08, 2023 pm 02:52 PM

mongodb

An in-depth analysis of the MongoDB storage engine (with schematic diagram)

This article will introduce you to the relevant knowledge about mongodb and introduce the storage engine in MongoDB. I hope it will be helpful to you!

Dec 06, 2022 pm 05:00 PM

mongodb

MongoDB 4.X basic tutorial

MongoDB is a product between a relational database and a non-relational database. It is the most feature-rich among non-relational databases and is most like a relational database.

Jul 18, 2022 am 10:09 AM

MongoDB