Mongodb find duplicates However, MongoDB provides powerful aggregation features to help us solve such issues effectively. MongoDB boasts aggregation operations, which group values from multiple documents together, and can perform a variety of operations on the grouped data to return a single result. Using MongoDB’s Aggregation Framework this can be done easily. I'd like to check if any of the "name" fields are duplicates. Sep 18, 2021 路 I would like to extract from the collection the IDs of documents that have duplicate IDs of “drives” objects that are nested in the array that is in “streetModel”. Delete extra occurrences using MongoDB’s bulkWrite(). . In this guide, we’ll implement easy-to-use operators to demonstrate Sep 2, 2023 路 馃摑 Tech Blog: Unraveling Duplicate Records in MongoDB Are you tired of dealing with duplicate data in your MongoDB collection? 馃攧 It's time to put an end to the confusion and clutter! In this blog post, we'll dive deep into the world of MongoDB and unravel the mystery of finding duplicate records. This has happened in all documents of my database - some nested documents have the same _id despite having different content/values. However, I think this solution is neat and easy to understand. Keep only one document per group and collect _id s of the duplicates. Dec 27, 2023 路 In this comprehensive guide, you‘ll not only learn how MongoDB handles duplicate records behind the scenes, but also practical methods for finding, managing, and preventing duplicate data from plaguing your collections. In the mongodb compass when I known the value i c Jan 11, 2022 路 I have a collection with several arrays/sub documents. So, let’s break down your requirements. In this article, we'll explore various methods of how to find duplicates in MongoDB collections and discuss how to use them with practical examples and How would I find duplicate fields in a mongo collection. Dec 15, 2021 路 Find Duplicate Documents In MongoDB Collection Sometimes you want to remove all the duplicate documents from a collection but you don’t know how to find them. Delete duplicate records from the original collection, keeping one original Jan 24, 2022 路 In the MongoDB I want to search for all duplicates on a certain field ownersEmailAddress with or without upper letters (any combination of letter). Before you duplicate data, consider the following factors: How often the duplicated data needs to be updated. By implementing one or more of the methods discussed in this tutorial, depending on your needs and database size, you can ensure that your data remains clean and reliable. Jul 22, 2024 路 Hi @Mohammad_Yusuf_Ghazi , It looks like you are facing a problem because you are doing a group and after that you need to access your full document. I want to find out if there are duplicates in ‘_id’ field. For example; in the below sample doc I shared the child array and the jobs array both have duplicates in _id field despite all other fields being Jul 23, 2025 路 Duplicate documents in a MongoDB collection can often lead to inefficiencies and inconsistencies in data management. Oct 30, 2021 路 Finding duplicate documents is challenging in MongoDB. Oct 18, 2021 路 In this post, I describe how to find duplicated documents in a MongoDB collection using a query or a GUI. Insert duplicate records into a new collection, ensuring full documents are copied. Identify duplicate records based on a key. Feb 3, 2024 路 Conclusion Removing duplicate documents in MongoDB is crucial for maintaining the efficiency and accuracy of your database. Query :- Will be like Feb 29, 2012 路 To find duplicates in MongoDB, we would tackle the problem in a similar way. However, the extra logic needed to handle infrequent updates is less costly than performing joins (lookups) on read operations. Nov 29, 2022 路 Efficiently Identifying Duplicates using MongoDB One question that comes up time and again on Stack Overflow or the MongoDB Developer Forums is “how can I find duplicate X and get a list of Y that contains these duplicates” (ex: “Query to find duplicate users (ip)”). Mar 18, 2025 路 Find duplicate documents by grouping them based on userId and startTime. Nov 17, 2021 路 This tutorial explains how to find duplicate values in MongoDB, including several examples. Jul 23, 2025 路 Duplicates in a MongoDB collection can lead to data inconsistency and slow query performance. Being new to mongoDB, I spent a lot of time and used other lengthy solutions to find and delete duplicates. Feb 25, 2016 路 30 We only have to group on the bases of 2 keys, and select the elements with count greater than 1, to find the duplicates. Frequently updating duplicated data can cause heavy workloads and performance issues. A MongoDB database is a type of database that gives you the ability to create applications that can perform much more than just CRUD operations, providing the ability to query, print, and update data, it supports many operators that can be used to find duplicates. Therefore, it's essential to identify and handle duplicates effectively to maintain data integrity. Feb 16, 2023 路 In this blog post we record useful MongoDB operations in regards of finding and removing duplicate documents, as this is a common problem developers face. zdso tirwsg nzqo bwucu iwi csnctsn vdw wiymo sbmw oiifdk cglebx tnqa hthpvq dxtx umv