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You can use a database to store pictures and other small images in a database table. Such picture files can be processed more efficiently on a file server. However, when image data is stored in a binary field, it can only be accessed by app...

My new job at IBM is as a development support person. That means I spend most of my time dealing with databases. In my workflow, I spent some time on MongoDB, which is a document database. But I encountered some problems in retrieving recor...

The MongoDB software for Windows can be downloaded from https://www.mongodb.org/downloads. Note: Mongodb 2.2 and later will no longer support Windows XP.     After the download is complete, start the installation. It is the same as other...

This article introduces the process of installing mongodb on Centos. The installation of software will definitely involve 32-bit and 64-bit. Since my system is 32-bit, I will use the 32-bit mongodb software here. You can choose the correspo...

MongoDB stores all data records in separate BSON documents. An identifier is provided to uniquely identify each document. The identifier helps users uniquely locate the document when searching for other documents. With the help of identifie...

$in Operator searches within an array that you provide. For example, if you are given an array and want to search for one or more matching elements in a MongoDB collection, you can use $in . Use $in the operator to search for a specified ar...

Today, we will learn how to project nested fields when querying data in MongoDB using the $project and $unset aggregation stages, forEach() loops, and methods. mapReduce() MongoDB item nested fields In MongoDB, we can find() retrieve all do...

This article demonstrates how to convert a timestamp to a date in MongoDB. It also explains how to count entries for a specific date. Convert Timestamp to Date in MongoDB Converting from timestamp to date depends on the type we are saving t...

This article will explore the number of ways to get the last N records in MongoDB, where N is a positive number greater than zero. We will see how to retrieve the number of documents with and without sorting. Get the last N records in Mongo...

This article is a step-by-step installation and configuration guide for Elasticsearch on Windows and Ubuntu 20.04. It also demonstrates using Elasticsearch with MongoDB on both operating systems. What is Elasticsearch Elasticsearch is a NoS...

Today, we will merge two collections into one using $lookup the Aggregate stage, the pipeline AND $unwind operator, the Filter stage, and MongoDB Compass. $project Merge two collections into one using MongoDB We have different ways to combi...

MongoDB is very hungry for unstructured data and belongs in any database developer's toolset. Some aggregation processes are much slower than relational databases, even with existing indexes. This is the case when using joins between collec...

This article teaches you how to use pipelines in MongoDB's lookup Aggregation Pipeline operator. Before proceeding, you must have enough knowledge about the aggregation pipeline and the Aggregation Pipeline operator to understand the use of...

To perform aggregation operations with MongoDB, you need to have a good understanding of the aggregation pipeline stages. This tutorial will explore $sort the stages through an example to perform a MongoDB aggregation sort. MongoDB Aggregat...

Comparison operators are very useful when working with large data sets. They are helpful in gaining insights from the data. $nin This article explains how to use the ( ) comparison operator in MongoDB NOT IN . It also shows how to use $nin...