Mongodb remove duplicate documents. Remove duplicate documents based on field.

Mongodb remove duplicate documents MongoDB -- Find duplicate documents by multiple keys. To Remove Duplicate Documents: MongoDB We learnt how to create unique key/index using {unique: true} option with ensureIndex() method. Added by author: Also remove . First thought comes to my mind is to drop the index and reconstruct the index with dropDups. To prevent the duplicates being inserted you need a unique index which can be created in C# code:. What’s the easier/most efficient way to accomplish this? How to remove duplicate record in MongoDB 3 x - To remove duplicate record, use aggregate(). ensureIndex({'duplicate_key' : 1},{unique: true, dropDups: true}) where duplicate_collection is the collection where your duplicate Find all duplicate documents in a MongoDB collection by a key field. time process and you want to do this faster then I would suggest you can do this operation on your local machine in the MongoDB server after taking dump of the collection and you can I am trying to delete records based on the following criteria: Any duplicate record based on "data. yourCollection. The index creation is quite slow, takes about 2 hours despite using most In this tutorial, we will show you how to identify and remove duplicate records in MongoDB using three different methods: We will also show you how to remove duplicate records using the You can find duplicate values within your MongoDB database using the aggregate method along with the $group and $match aggregation pipeline operators. From what I've read, this shouldn't be possible. We have added unique index as below, but still duplicates with serviceId , productId combination are being allowed. forEach(group => { // Remove one document from the list of duplicates to keep in the original collection const [docToKeep, docsToMove] = group. MongoDB Distinct Count issue. 11. Share. In the MongoDB Atlas UI, click Database in the sidebar. Since each document is one grade, it should remove one document per student. toISOString(), 'date'), but it I think you should use the MongoDB ensureIndex() to remove the duplicates. Delete multiple occurences of same object. In the left navigation pane, select the sample_mflix database. This is a generic way of comparing any type of data in a single collection, and removing duplicates. insertOne({FirstName:Chris}); { acknowledged : true, insertedId : ObjectId(5e775c37bbc41e36cc3caea1) } > db. Find duplicates across multiple MongoDb collections. We need to divide the task into two parts I have a large collection of about 300M documents and I want to add an unique index on a collection. Atlas Documentation Get started using Atlas Server Documentation Learn to use MongoDB Start With Guides Get step-by-step guidance for key tasks. Improve this answer. This behaves in a similar way to SQL’s UNION MongoDB query to remove duplicate documents from a collection. Ask Question Asked 8 years, 10 months ago. Here's my current aggregation pipeline: I want to delete all duplicates from values array, so the result would be: For older Mongo versions you'll have to read each document into memory and do this in code, then update each document separately. script above will remove all duplicate documents. On PHP Side : having something like mysql "insert (value) on duplicate key update rate=rate+1". Currently, there are 176039 documents and counting, half are duplicates. Hot Network Questions Am I legally obligated to answer Census questions? Book series: starship officer returns to the academy where he trained with gardener in martial arts Piping grep With sed The MongoDB remove() method is used to remove documents from a collection based on specified criteria. How to find mongo documents with no duplicates values for a given field. 2 Remove duplicates from MongoDB Duplicate Documents even after adding unique key. In the documents we will have 100 attributes so we can not find documents based on few attributes. Refer to findAndModify command. So in that last form the returned result from your sample data identifies the duplicate: Being completely new to MongoDB, I am finding this challenging. 3. MongoDB query to find document with duplicate value in array. I have an mongo instance (about 120GB RAM, 250GB SSD) running 4. Finally it should be { "_id" : ObjectId("55695ea145e8a960bef8b87a"), "name" : "ABC. We have total 7 documents/records out of 2 documents/records are duplicate. How can I accomplish this? Please refer to this example to understand my problem: My collection name &amp; questions are in this col If you want to remove the "duplicates" from a collection then your best bet is to run an aggregation query to determine which documents contain "duplicate" data and then cycle through that list removing "all but one" of the already "unique" _id values from the target collection. Index: db. Map-Reduce is another method for identifying duplicates in MongoDB. If I manually try to delete the key, it is taking Remove duplicate in MongoDB. Commented Sep 21, Spring Data MongoDB adds _class in the mongo documents to handle polymorphic behavior of java inheritance. How to get the list of docs that exist more than 1 time in mongoDB with the same field? 1. I recently create a code to delete duplicated documents from MongoDB, this should work: How do I find and remove duplicate mongo documents with ruby. remove(query); Be wary, though, if number of matching documents is high, your database might get less responsive. _id : 5b41d9ccf10fcf0014fe8917 originName : "Hartsfield Jackson Atlanta International Airport" destinationName : "Antigua" totalDuration : 337 I have to work with MongoDB for my job, but I'm not very comfortable with it. 1 How do I find and remove duplicate mongo documents with ruby. How to find documents with unique records in MongoDB? 0. [{ "_id": ObjectId("578953db976cea724bbdbb60"), In response to your comment I would suggest the following query to get the list of all document ids that contain duplicate hashes: MongoDB remove duplicates from a nested array. How can I add the index and get rid of the duplicates? I have about 400,000 documents, and I need to remove all duplicates using the id field. 6 Here is a sample of my schema structure: I have a large collection of about 300M documents and I want to add an unique index on a collection. I want to delete document if salary. So it means from every student_id there exists 4 'type' out of which two 'type' are 'homework' . collectionname. Refer to this documents below: a:1,b:2,c:3, a:2,b:2,c:3, a:1,b:4,c:3, a:2,b:2,c:3, a:1,b:5,c:6 So, i want duplicates of the documents Skip to main content. I have a large collection of about 300M documents and I want to add an unique index on a collection. When specifying collation, the locale field is mandatory; all other collation fields are optional. That is whenever I try to insert a document I only need to remove duplicates from the existing database. 5. createIndex( { _id : 1, “subscriber. Below is example of the source MongoDB document and sub-documents: I have an array called "doc" which contains a list, in which some of them contains same ref object id, I have to remove that duplicate, but none of the code is working because I'm filtering according to ref object id, which is in the form of object. We have to remove the lowest score out of two 'type':'homework' document. To delete a single document sorted by a specified order, use the findAndModify() method. Luckilly the documents have an Remove duplicate documents based on field. I have solution with aggregation framework for collecting duplicates and then removing in one go. Join us! MongoDB Developer Community Forums MongoDB remove duplicate pip install mongo_remove_duplicate_indexes. Remove duplicate records from mongodb 4. // Step 2: Insert duplicates into the new collection duplicates. For an example of a document { key1: {} key1: null } Is there an easy way to find keys like that and remove the first one or the one which having value that is null across documents in a collection? Thanks To delete a document in MongoDB Atlas, follow these steps: 1. MongoDB: find duplicates across multiple keys. To delete a single document you can use deleteOne() or remove()with single:true and deleteMany() or remove() to delete multiple documents :-Using deleteOne() I do a lot of write operations on this collection, using the Perl driver (insert, update, remove, save) and mongoimport. 10. Let's say, you have 100k documents to delete from a collection. Remove With the options to {query: , remove: true, new: false}, it will delete a single document and return the removed document. Remove duplicate documents based on field. Remove Duplicates from MongoDB. after running the script the collection contains only those documents Remove List Duplicates Reverse a String Add Two Numbers Python MongoDB Delete Document Previous Next Delete Document. 10 Remove duplicate documents based on field. MongoDB remove duplicates from a nested array. db. Hot Network Questions Unlock the power of data and AI by diving into Python, ChatGPT, SQL, Power BI, and beyond. If no collation is specified for the collection or for the operations This is the sample sample json, inside text array I have duplicate values like "SEQUENCE": 1 is repeated, I want only one record to exist, can some suggest how to remove the duplicate record. I am trying to find out how I can make a mongodb aggregation to delete duplicate documents according to a specific parameter. Am using php driver to insert documents with same uid and sid and it is getting inserted. How to remove duplicates based on a condition in Mongodb? 0. Retrieve only the queried element in an object array in MongoDB collection. If the collation is unspecified but the collection has a default collation (see db. 0. I have a collection with the field called "contact_id". About; Note the insert creates a copy as we've removed the original document's _id. There are 76 keys in each document and each one has one duplicate. 568. How to get all duplicates By definition, duplicates must have the same value. Another approach would be to create additional documents using a tool like mgeneratejs that supports schema templates and data generation. 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. Merge duplicates and remove the oldest. How to remove duplicate record in MongoDB 3. What’s the easier/most effic I am trying to create a unique index but it’s erroring because of duplicate documents I currently have. createCollection()), the operation uses the collation specified for the collection. The index creation is quite slow, takes about 2 hours despite using most of the RAM and it is erroring out at 99% saying there is a dupe key. Remove duplicate array objects mongodb. e. ensureIndex({a: 1, b: 1}, {unique: true, dropDups: true}) Share. On Mongo Shell : Add unique key on uid and sid with no duplicate documents with the same uid and sid. Select the movies collection. Finding duplicates in mongo. You Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company You can't do a reduction and eliminate duplicate documents using just find with MongoDB and a projection. If you're a new version, please When specifying collation, the locale field is mandatory; all other collation fields are optional. Hot Network Questions What does "in any reasonable manner" of the Creative Commons Attribution clause mean? Hello everyone, I’ve been using influxdb for time series for the last past year but I wanted to try mongo time series recently. If you have a huge dataset there are better ways to achieve this, but this should work for general use. I think you should use the MongoDB ensureIndex() to remove the duplicates. findOne({_id: 'hi'}) And now I want another document in the collection with _id 'bye'. In this post, I describe how to find duplicated documents in a MongoDB collection using a query or a GUI. I have many documents as such. In this article, We will learn about MongoDB Find all duplicate documents in a MongoDB collection by a key field. Unfortunately, I am rather new to using MongoDB and do not know how to express this in a query. insertOne({FirstName:David}); { acknowledged : tru Display all documents Hi Team, We’re trying to find duplicates methods in our collection with about 2 or 3 millions of documents, we have tried this way but this seems slow and cannot be ideal when deploying to production, do you know what’s the best and fastest way to delete duplicate records with million of data. I need to delete all but 1 sub-document if a sub-document field has specific value. Check duplicates of certain field for documents array with inner array. Stack Overflow. Please post the two example documents, and point out which one should be deleted. 10 Remove duplicate documents based on The MongoDB remove() method is used to remove documents from a collection based on specified criteria. When removing multiple documents, the remove operation may interleave with other read and/or write operations to the collection. Remove the grade of type "homework" with the lowest score for each student from the dataset. MongoDB Manual: How to delete documents in MongoDB. MongoDB . If you want to clone the row, but without explicitely typing a new id, just delete the "_id" property before doing the insert 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. Add a comment | 1 Answer Sorted by: Reset to default 0 You should use an Index over you code field: db. uuid" WHERE lastCheckin is NOT the most recent OR organizationId is missing. These documents have the same key beatmapset_id I want to delete all duplicates but leave the document with the most difficultyrating. Remove Duplicates on mongodb. MongoDB will automatically create this To delete all documents from a collection, pass an empty filter document {} to the MongoDB::Collection::delete_many() method. Each document has a single word stored in the same format as above. Platform Services. Find and delete duplicate Entries in an embedded Array. We'll cover the concepts, syntax, and practical examples to How to remove duplicates from MongoDB Collection? For this, set “ unique:true ” i. ensureIndex({'duplicate_key' : 1},{unique: true, dropDups: true}) where duplicate_collection is the collection where your duplicate It is possible with another different command. 2 Remove Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company They all have an unique _id field as well, but I want to delete duplicates accodring to another field (the external ID field). Hot Network Questions Need an advice to rig a spaceship with mechanicals part How to balance minisplits and oil furnace for winter heat? Duplicate documents in a MongoDB collection can often lead to inefficiencies and inconsistencies in data management. Users. <collection>. Here we will see how to find duplicate records in MongoDB. 2 Remove all Duplicates except the most recent document. 0. You can use the `delete()` method to remove In this case, the output indicates that the product name "Laptop" has duplicates, with the _id values of the duplicate documents included in the duplicates array. change searchBy to what you are trying to find the document by. docs; // Insert the duplicates (excluding one record) into the new collection db[newCollectionName]. Duplicating data lets your application query related information about multiple entities in a single query while logically separating MongoDB: Removing duplicate document based on ObjectId? 1 i want to remove all my duplicates and keep only one duplicate - mongodb. find duplicates in array per document in mongodb. 13 Removing duplicates in mongodb with aggregate query. Specify a query filter document. In the MongoDB I want to search for all duplicates on a certain field ownersEmailAddress with or without upper letters (any combination of letter). Saleem Saleem. How to remove duplicates based on property after an aggregate query? 0. MongoDB remove duplicate subdocuments inside array based on a specific field. ensureIndex({'code' : 1}, {unique : true, dropDups : true}) unique will ensure you will not have duplicates anymore. How to get all duplicates documents in mongodb collection? 1. This method offers flexibility in deletion and supports various options like removing only one document and specifying a write concern. How to take the duplicate records in mongodb. Could you help is restricting the duplicates in array. How to remove documents in MongoDB. I have 100 documents like this. I won't be adding any additional records in the future. MongoDB - remove duplicate values in group And then we can make another query, which will find all the duplicate documents. ) Minimal illustrative example: The documents all have the following fields (there are also other fields, but those are of no relevance here): How can I duplicate a document in MongoDB, changing the _id of the new one? Imaging that you have the original document: > var orig = db. However, MongoDB provides powerful aggregation features to help us solve such issues effectively. It is often advised to delete documents in smaller chunks. mongodb aggregate distinct count. Remove duplicates from MongoDB 4. MongoDB - remove duplicate values in group by list. Now lets see how we can create unique key when there are duplicate entries/documents In the example above it would remove one document, either {name:"duplicate", value:true, id:2910921} or {name:"duplicate", value:true, id:32838293}, it does't matter to me which one. On the terminal if you type 'show dbs' (without quotation' ') it would list all the databases including 'abc' 2. Note: dropDups will not work in MongoDB 3. I have about 400,000 documents, and I need to remove all duplicates using the id field. 1 Remove Duplicates on mongodb. Mongo remove duplicates in array MongoDB Find documents which have duplicate propety values. here is the code which i tried, from pymongo import MongoClient conn=. Ascending(field); Remove duplicate documents based on field – radulle. How to remove a field completely from a MongoDB document? Hot Network Questions Is humanity a "genetic To find duplicates in MongoDB, we would tackle the problem in a similar way. That will avoid the overhead of re-inserting documents that will result in duplicate key errors. I call my own defined func like remove_many('sysinfo', new Date('2022-05-18T13:55:37. It's a similar concept to aggregate functions in SQL. So I learned not to query the iso date directly -as it is a string and not a date - but use the function ISODate(my-iso) which is in Node new Date(123T45Z). Need to have only unique combination of productId and serviceId in “arrayfileds” array. Delete multiple documents based on group by and sort operation. When I say duplicates I don't mean that the whole document is the same. 4. 17 How to delete the documents returned by group in mongodb? 1 MongoDB3. 0 you will need to use Aggregation . How to delete Duplicate objects inside array in multiple documents in mongodb? 0. MongoDB query to remove duplicate documents from a collection. aggregation, remove processed document. Hot Network Questions A I want to remove duplicate data from my collection in MongoDB. 0 Delete all duplicates of record in collection - MongoDB . Sing's log, a developer's blog. Email)); var indexDefinition = new IndexKeysDefinitionBuilder<Model>(). duplicate_collection. Remove duplicate in MongoDB. I use the aggregate function to find multiple entries for the same email-> find all entries with that email and associated numbers and then output these to a new collection called duplicates using the following command: If you are going to iterate all the documents anyway, I think a more straightforward approach would to iterate sorted by the id field (assuming that's the field that wants to be unique) and remove() duplicate documents (where the current id matches the previous one seen). Sometimes you want to remove all the duplicate documents from a collection but you don’t know how to find them. month not equal to 2 for same "_id" value as given above dataset . 2 Remove duplicate records from mongodb 4. What I want. 1. Below is example of the source MongoDB document and sub-documents: The last form could be useful to you if you actually want to "remove" the duplicates from your data with another update statement as it identifies the elements which are duplicates. How do I remove duplicates in mongodb based on multiple fields? 0. Basically my collection has this schema. How can i delete those documents. I can easily generate (using aggregate) duplicate records for the same, single, key (eg: comment), but I can't figure out how to group by/aggregate for multiple keys. from that i need to delete the duplicate entries. 0 MongoDB Removing Duplicate subdocuments. Using Map-Reduce. 6 Also I believe dropDups is depreciated as of MongoDB 2. My problem is that somehow, I have duplicate documents on the same _id. NET, ASP. Each document is structured like so. MongoDB - Find duplicated How to find and delete duplicate documents in MongoDB - droganaida/mongodb-dropdups MongoDB query to remove duplicate documents from a collection. My sample record would look like, { name:String, slug:String, metaDes:String, content:String, parentID:String, thumbnail:String, display:Boolean, } I am having a lot of duplicate records in Essential MongoDB operations including removing duplicates, renaming databases, aggregation, indexing and more. deleteOne method is used to delete a single document in MongoDB. If I manually try to delete the key, it is taking hours. NET Core, Blazor, EF Core, WPF, TypeScript, etc. It might be somewhat slower than system level "index" changes. This method offers flexibility in deletion and In MongoDB, the $unionWith aggregation pipeline stage performs a union of two collections, and it includes duplicates. Related. 90 posts. Remove duplicates by field based on secondary field. This method deletes a single existing document from the collection that matches Fastest way to remove duplicate documents in mongodb. Skip to content. Let me know if that makes I want to duplicate my document based on a field in MongoDB. toISOString(). shift() and then store the other _ids so you can remove corresponding documents . It can remove one or all documents matching the query expression. I am unable to figure out a way to do that. Hot Network Questions so you iterate over the results and for each documents you remove the first _id (as you need to keep one document among the duplicates) with match. var query = {name: 'John'}; db. Please suggest me a single query which i can use to do this. 1 Mongodb query for merging documents with the same key. insertMany(docsToMove); }); The answer I pointed to suggests that the _id will return the most recent items: "If you use the auto created _id field it has a date embedded in it so you can use that to order by". mgeneratejs uses the Chance library to generate random plausible test values for different field types. Local Events: MongoDB is heading out on a world tour to meet you and bring the best content directly to you. not [email protected] MongoDB remove duplicate subdocuments inside array based on a specific field. the problem with this is that unwind can generate really big amount of documents in the pipeline (i just ran into a case that unwind generated 1 million documents), and the group stage memory is limited to 100MB by default, and yea, you could increase the available memory, but it is not always possible, neither desirable. 11 Remove duplicate in MongoDB. I tried db. 7 million documents) in mongodb, and there are a lot of duplicates. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Because I did a Insert, i multiplied my documents everytime I saved them. So rather than force the aggregation pipeline to do the sorting, the most logical and efficient thing to do is simply sort the list of unique _id values returned per document as you process each response. Thanks in advance. The find commands won't work as you need remember that it's returning a cursor to the client and as such, can't reduce the results to only those documents that are unique without a secondary pass. Kotlin Spring MongoDB remove _class from When web-scraping my code is sometimes fetching duplicate entries to MongoDB Realm. Delete all but one duplicate from a mongo db. When you embed related data in a single document, you may duplicate data between two collections. Count the number of duplicate elements in MongoDB. Hi all, we use a time series collection and need to regularly collect and display the first 50, 100, 250 documents of a device. So I want to delete all duplicates except the first one, that i wrote. If you have two documents with different values, they're not duplicates. Follow answered Feb 29, 2016 at 23:20. Please help me. I am using aggregation pipeline . Commented Oct 27, 2015 at 9:45. I have to gather some documents and remove duplicates according to one field. The following example deletes all documents from the inventory collection: I somehow created duplicates of every single entry in my database. (For each duplicated document, I only want to save one, which can be arbitrarily chosen. MongoDB - Remove duplicates in query. 27. This will allow you to insert a new record with new _id assigned from mongodb. Also there is one API findOneAndRemove in Mongoose, Finds a matching document, removes it, passing the found document (if any) to the callback. MongoDB - duplicate documents removal. 10. MongoDB: Removing duplicate document based on ObjectId? 0. I need to find records in this collection that contain duplicate values for the both the comment AND the url_key. Find Duplicate Documents In MongoDB Collection. Remove Duplicate Documents: MongoDB We learnt how to create unique key/index using {unique: true} option with ensureIndex() method. If no collation is specified for the collection or for the operations, MongoDB uses You can use a query to remove all matching documents. Efficient way to delete multiple documents in MongoDB. Removing documents from MongoDB that have same property values contained within an array. 0 I need an operation to remove the duplicate values from the bill_codes. To effectively remove duplicates in MongoDB collections, consider the following steps: Identify Unique Fields: Determine which fields in your documents should be unique. MongoDB Find documents which have duplicate propety values. So in that last form the returned result from your sample data identifies the duplicate: If you ever find yourself in a position where you need to remove duplicate entries on a MongoDB collection, as per version 3. Atlas Build on a developer data platform. 420. Using this as test data (removed the _id): Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Because of an accident while coding that our documents are having some duplicated keys. I've removed the duplicates, but others still appear. createIndex({'indexname':1},unique:true),and insert your documents from previous collection to new collection and since key you wanted to be distinct Specify the justOne option to limit the operation to removing a single document. Find duplicate values inside an array in Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog My DB has some documents like: id user_id 1 1 2 2 3 2 4 null 5 null I want get all document, but only get the MongoDB - remove duplicate values in group by list. Mongo Query to get duplicate entry from sub document array. ensureIndex({'myKey' : 1}, {unique : true, dropDups : true}) The following index will keep the first unique document and drop any duplicates followed by that. x? 2. With the options to {query: , remove: true, new: false}, it will delete a single document and return the removed document. 8,978 2 2 gold badges 21 21 silver badges 34 34 bronze Context: I have a MongoDB database with some duplicated documents. 10 I’m trying to remove duplicates of documents, in the collection the collection have millions of records and duplicates data I assume have 100k records. Products. This at least covers techniques. removing duplicate array values from mongodb. Added Being completely new to MongoDB, I am finding this challenging. This step-by-step guide will show you how to identify and remove duplicate records from your MongoDB database, so you can keep your data clean and organized. Match only the documents that have duplicates; Slice the documents array to leave 1x document in the collection; Unwind the array with documents to be removed; Do forEach loop to remove the duplicated documents from the collection and store the removed in backup collection just in case you have doubts later. How to remove duplicate entries from an array? 10. Also I believe dropDups is depreciated as of MongoDB 2. ) You can now remove the duplicate The last form could be useful to you if you actually want to "remove" the duplicates from your data with another update statement as it identifies the elements which are duplicates. Blog about Microsoft technologies (. Now, I want to remove the duplicate documents from the collection. 2. the unique constraint and avoid inserting duplicates as in the below syntax −. col For example the name of the db is 'abc' and under that there's a collection by name 'users' and users has an email which is '[email protected]' which you want to remove: 1. best way will be to create a python script or in any language you prefer,iterate the collection ,create new collection with a unique index set to true with db. Hot Network Questions Basic, general lexer for a programming language The objective here is to find the duplicate records in the sub document based on the condition and return the output as mentioned below. To delete one document, we use the delete_one() method. The first parameter of the delete_one() method is I’m trying to remove duplicates of documents, in the collection the collection have millions of records and duplicates data I assume have 100k records. For instance, if you have a collection of users, the email field should be unique. For descriptions of the fields, see Collation Document. Meziantou's blog. For instance, in your case, you want to drop the duplicate documents give the key duplicate_key, you can do. MongoDB - Find duplicated When creating the index, you can give the dropDups option, which will remove all but one duplicate: db. collection. 210Z'). Hot Network Questions Is there exist i have a mongoDB collection with more that 5 millions records. 0 or above. What is the fastest way to remove duplicates? dropDups: true option is not available in 3. MongoDb: Find exact array match with I have a collection in mongodb where every document has a duplicate. Now lets see how we can create unique key when there are duplicate entries/documents Use the following MongoDB operations to identify duplicate documents in your collections, and remove them safely. Modified 4 years, 8 months ago. msisdn”: 1, Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I need to remove duplicate arrays and keep only unique array values like below. The above code sample shows one document. Hot Network Questions Is 1/2" pipe adequate for supplies inside a home? How to get all duplicates documents in mongodb collection? 1. MyCollection. This method involves In this article, we'll explore how to remove duplicates using the $unionWith aggregation stage in MongoDB. Afterwards remove the _id from the new list as you can't from the current data. For the database deployment that contains the sample data, click Browse Collections. Platform. 259 tags Hi @Ruchi_Ninawe, @MaBeuLux88_xxx’s hack will help you create duplicate documents which differ only by _id. How to find duplicates when queried by a certain field in Mongo Db collection using Spring data. Mongodb delete documents without associated documents. But the next document may have a results key that contains jobkeys with duplicate values to the ones listed above. This might seem a bit confusing because in SQL you only need to use a simple “Group By”, which will display the data fields grouped by certain column like in the following example In order to remove duplicates based on a key, you can create an index on the collection and enable dropDups like this,. Counting distinct values in MongoDB. Viewed 17k times 11 . MongoDB query to remove duplicate documents Remove duplicate documents based on field. How to purge duplicate objects from MongoDB. If you want to remove _class just drop following Config class in your code. So basically working with the listing that you must have found: Remove Duplicates from MongoDB Remove Duplicates; My current implementation of removing duplicates is as follows. Database Deploy a multi-cloud database Search Deliver engaging search experiences Vector Search Design intelligent In this post, I describe how to find duplicated documents in a MongoDB collection using a query or a GUI. 489. Delete document in mongoldb aggregation. public void CreateIndex() { var options = new CreateIndexOptions() { Unique = true }; var field = new StringFieldDefinition<Model>(nameof(Model. Mongo remove duplicates in array of objects based on field. demo438. Help me. Commented Jun 9, 2020 at 18:12. change collectionA and collectionB to the name of the collection to create you copy to. so need to find those duplicate document/records and delete from same collection. and I’ve been doing some tests however I couldnt find out why it allows duplicate values and a way To delete a single document you can use deleteOne() or remove()with single:true and deleteMany() or remove() to delete multiple documents :-Using deleteOne() I'm trying to find a way to find and remove duplicate object with the same field in a subdocument array. For example I have the following documents: I want to delete all docs with a certain date from Nodejs. I tried running ensureIndex({id:1}, {unique:true, dropDups:true}) on the collection. Let us create a collection with documents −> db. In this blog post which is part of the series "A Developer's Notes", we'd like to record useful MongoDB operations in regards of finding and removing duplicate documents, as thi I need to delete my duplicate documents in database. Use Indexes: Create unique indexes on the fields Possible duplicate of Fastest way to remove duplicate documents in mongodb – Somnath Muluk. But it is good by considering This tutorial covers various methods to remove duplicate documents in MongoDB, ranging from simple queries to more complex aggregation processes. How can I make my MongoDB database contain only unique entries and remove duplicates? Below is the code from Mong Specify the justOne option to limit the operation to removing a single document. . I have a very large collection on MongoDB and I want to remove the duplicate record from that collection. ensureIndex({beatmapset_id: 1}, {unique: true, dropDups: true}) but it leaves a random document and I want the condition above. How to remove duplicates based on property I have a large collection (~2. Please change collectionName and the fields for _id, which are supposed to be unique, to In this article, we are going to see how we can remove duplicate entries in MongoDB, and also we are going to see an example with a proper explanation to make the topic easier. Find objects between two dates MongoDB. Mongo churns away at it for a while before it decides that too many dups on index build with dropDups=true. How to count array duplicate elements in MongoDB. When removing multiple documents, the remove operation may In the MongoDB I want to search for all duplicates on a certain field ownersEmailAddress with or without upper letters (any combination of letter). Navigate to the collection. MongoDb aggregation delete duplicates Remove duplicate documents based on field. The `delete()` method allows you to delete documents from a collection. 4 Remove Duplicates from MongoDB. There aren't any duplicates in that document. First, I tried a very manual approach with lists and deleting afterwards, but the DB seems too big, takes very long and is not practical. how to find and remove duplicates documents from mongodb using python. 2. mongodb; Removing duplicates in mongodb with aggregate query. Find number Learn how to remove duplicate records in MongoDB using a simple query. possible duplicate of Spring data MongoDb: MappingMongoConverter remove _class – Athlan. – MongoDB is a JSON based document-oriented database that can handle big size of data without compromising the performance. Time Series Collections I have a collection in MongoDB where there are around (~200k records). Implementing Normalization in MongoDB. 6. Here is a (very very) simplified structure of a document : { 'user': 'The User', 'report': { 'id' : 0 Sing Ming Chen. How to specify conditions for removing or deleting documents in MongoDB. the cost of finding the documents with duplicates or updating every document whether it needs it or not. aggegrate([ Aggregation operations process data records and return computed results. Hot Network Questions Does light travel in a straight line? If so, does this contradict the fact that light is a wave? Hi All, We have a document as below. Individual entries must be unique and updatable, so duplicates must always be filtered out (using a Finding duplicate documents before creating unique index - MongoDB Loading How to get all duplicates documents in mongodb collection? 1. Problem: I want to remove all duplicated documents. hahe ksmex qcdm aagxz jbxrjy uzvhhnj zuhlx rhlwmq msx qpazu