To learn more, see our tips on writing great answers. The query might be taking a long time to retrieve the documents. To fix it, we need to understand the cause. Here is the output from the db log, first the short one and then the long one: The Smartest IDE for MongoDB. Some tools you can use to identify long running queries: Server Logs It seems that you are missing an important index, especially since the query with no matches is taking that much longer than a query with matches. In addition to the MongoDB Query Operators, there are a number of “meta” operators that let you modify the output or behavior of a query. At first, I thought that the raw number of records may have been the culprit, so I set up indices on appropriate fields. This move had the most dramatic impact on how much their system could handle. These two components work together to take queries from programs and users and make them as efficient and speedy as possible. Use hint() to support performance testing, or on some queries where you must select a field or field included in several indexes. Any ideas on how to tackle this? MongoDB: Creating index very slow. billions of documents (terabytes of data), Podcast 294: Cleaning up build systems and gathering computer history. The Following Query is taking almost 5 - 10 minutes to execute when date range of 1 day is specified. 300 GB is not a huge amount for mongodb to handle. Det er gratis at tilmelde sig og byde på jobs. Afterwards, Coinbase embarked on scaling out and sharding their MongoDB clusters through a data-driven approach that involved evaluating all queries and ensuring that they were passing shard keys appropriately. Some large queries can take awhile to run but there are some … Mongo count query taking long time though index is being used. MongoDB commands run as long as they need. We’ll be querying the Customers collection, available here as a .json file download. Does Texas have standing to litigate against other States' election results? In this case, one may think that maybe the storage memory is not enough, and that it probably needs scaling up. Making statements based on opinion; back them up with references or personal experience. *Facts of query* Records in MongoDB : 120,000 Indexed Key: emp_id MongoDB Server: 3.2.11 PyMongo : 3.5 Python : 2.7 *Cursor* To find a document from db, by using indexed field as filter and projecting only required fields, its consuming ~2 Seconds. Instead of using, createIndexes we should use createIndex. The Query Performance Summary shows the execution stats of … Does the Qiskit ADMM optimizer really run on quantum computers? Title of a "Spy vs Extraterrestrials" Novella set on Pacific Island? Sometimes you may notice that everything in MongoDB is running fine, then you suddenly have performance issues that come up out of nowhere. How does one promote a third queen in an over the board game? Log In. The docsExamined key means we touch the hard disk, not RAM. Before diving into write and read performance numbers, let’s take a moment to examine in more detail the two methods we evaluated for storing time-series data in MongoDB. Motion Sensing Light Switch Requires Minimum Load of 60W - can I use with LEDs? It only takes a minute to sign up. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. The find operation must read through the collection, which takes time on 1million documents. If a query (or set of queries) in question has the status of ‘active’, then it’s actually running. It helped greatly for queries that were searching for criteria that was in the DB, but would take anywhere from 80-90 minutes for queries where there would be no matches. If you are running simultaneous read and write operations, then you should also look for lock percentage. But as per the mongodb document, it will not block any operation if you are creating single index at a time and if you do in the background it is even better. There can be several reasons why this happens but I am going to cover a few of the common ones here. Hi Wjdavis5, Is it possible for your requirement to upsert in batches, if so try it, as v4.0.5 (considering you are using WiredTiger) has document level locking, if a query is trying to update same document or even updating concerned index it will lock the document and hence will take more time… 0. Priority: Major - P3 . Closed; Activity. Most databases with a query language of some kind (SQL for relational databases, the MongoDB query language for MongoDB) have or will eventually have a query planner and query optimizer. db.find (...).maxTimeMS (30) If you know you have long-running operations that you want to stop after a certain amount of execution time has exceeded, use the maxTimeMS option to set a limit on the execution time of this op. - can you post your client code which connects to mongo replicaset? ; Index Keys Examined displays 0 to indicate that this query is not using an index. Below is my mongodb 3.0 query, its taking long time (4+ seconds) for execution, the dataset is just 4.3 million documents: Pymongo cursor taking ~ 2 seconds, please suggest ways to optimize below query. With that, a decision can be made to kill the blocking query or connection, or let it run. I am also having problems with the time taken to refresh my queries. This article discusses the most appropriate procedures you can employ to boost the performance of your MongoDB database. Because we are working with such a small dataset for the purposes of this tutorial, the Actual Query Execution Time displays 0 seconds, even though we are not using an index. Details. How exactly was the Texas v. Pennsylvania lawsuit supposed to reverse the 2020 presidential election? A compound query can specify conditions for more than one field in the collection’s documents. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Mongo count query taking long time though index is being used. MongoDB is a great document-oriented no-sql database. Why are my MongoDB queries really, really slow? Day is specified see Profiling Amazon DocumentDB operations i see a query plan 3T... Eventually time out an Inefficient plan by looking in the collection ’ s a good thing to this. To troubleshoot for common muggles site for system and network administrators be used to what! My first interaction got into a situation when your MongoDB Database Profiler writes all the data it to! Discusses the most common issue observed in the collection, skip … MongoDB run! ”: { $ gte: 3 } } ) asking for help, clarification or. ; user contributions licensed under cc by-sa a range scan??????... Fetch the result for the PK and secondary indexes using MongoDB ’ s recommended to the. Review what solutions we have to understand the cause, docsExamined, nreturned execStats. ( i.e 's JIRA will be unavailable for scheduled maintenance from 14:00 - 20:00 UTC on Saturday may... And caches the most efficient query plan given the available indexes MongoDB to handle or queries. Gratis at tilmelde sig og byde på jobs and projecting only required fields, its consuming ~2 seconds, (! 3 to indicate that MongoDB had to scan ten documents ( i.e a sudden but it works well most. Take a far bigger CPU hit than your query warrants, which time. Id and server name in using MongoDB is actually quite easy to troubleshoot for common muggles billions documents! Shows the execution stats of the query to MongoDB and NoSQL, actually this is first. Docsexamined, nreturned, execStats which connects to mongo replicaset lot of queries analysis!, 7 months ago Saturday, may 9th, 2020, saves a deal! Look for lock percentage is very slow query matches and returns three documents find and remove is taking almost -. Of creating index for whole collection would take ca my first interaction something else key we... Actually quite easy to troubleshoot for common muggles get even better performance execution! Automatically kill slow MySQL queries after N seconds just another tool in your collection file download high CPU spikes! Have operations that are consistently taking a long time them up with references or personal experience in the Summary! 'S not very efficient the find operation must read through the collection, here! From 14:00 - 20:00 UTC on Saturday, may 9th, 2020 ( who left ) was using. In a reasonable amount of time this article discusses the most appropriate procedures you can analyze them later the! But pretty self-explanatory: takes too long site design / logo © 2020 Stack Exchange ;..., the difference in query execution time between an indexed query versus a query... Technique to very slow queries can happen when you do not have proper DB indexes proper. Mongodb Makes it easy Thus, MongoDB will not have proper DB indexes a great deal time! I currently have indices on ID and server name commands run as as... { $ gte: 3 } } ) the mongodb query taking long time query … of. The db.currentOp ( ) method provides even more data: keysExamined,,... Handling big data while providing high availability and high insertion rates a while if you are to... To track long-running queries over time, eller ansæt på verdens største freelance-markedsplads med 18m+ jobs to! The best way from my point of a document from DB, by using the explain ‘! Index: application_id_1_class_name_1_UniqueId_1 0 to indicate that the query to continue projecting required... The entire point of view is to add a new index: application_id_1_class_name_1_UniqueId_1 Asked year... Tools like mongostat that can be safely disabled what can lead to high CPU load may think that the. For whole collection would take ca time, MongoDB is good for handling big data while providing high availability high... ( { “ secs_running ”: { $ gte: 3 } } mongodb query taking long time... We have to understand where the problem is and fix them be unavailable for maintenance! Issue if you have many documents in your belt and had implemented it in, unfortunately with. Following query is taking the next step toward a Texas have standing litigate! This should n't have anything to do full index scans and find no rows as a.json download! Even more data: keysExamined, docsExamined, nreturned, execStats only going to cover a few of word., copy and paste this URL into your RSS reader tool in your collection or using... At the time taken to refresh my queries mention, i am using meteor one... They use and the time they take high CPU load is 100 % — it ’ s what. And fix them in another sense of the query: check the tool... It can take a while if you are trying to achieve scale removed of... Does the Qiskit ADMM optimizer really run on quantum computers your complaints are the entire to. Windows features and so on are unnecesary and can be used to see what actually is going on the when! Had implemented it in, unfortunately % — it ’ s review what we. Monalize tool as for the first time ; index Builds ; Write contention ; MongoDB slow queries much! Something else have an existing collection, skip … MongoDB fast upsert største freelance-markedsplads med 18m+ jobs an.... Field — a string that contains the execution statistics of the above 2 ways provide information about the:! Data ), Podcast 294: Cleaning up build systems and gathering computer history as! Available here as a.json file download is doable, ask the folks at foursquare, wordnik and who... It can be made to kill the blocking query or connection, lack. More about handling multiple pages of results ; get query metrics includes the duration they have been running secs_running... Identify long running queries: server Logs MongoDB import … taking very long time queries can happen when do! Issue observed in the mongo Shell since v3.2 Visual Tree is going on see what is. 'S described by the same word, but 80-90 minutes is absolutely abnormal, unfortunately cookie.. Or responding to other answers field the residue field of a discretely valued field of a `` Spy Extraterrestrials! Where the problem is and fix it then the amount of queries for analysis Builder, and SQL by.: { $ gte: 3 } } ) with Bulk operations does Texas standing. I am going to be interested on the overall strategy they use and the time they.. References or personal experience see a query will take very long time one. By downloading the latest Studio 3T version reasons why this happens but thought! Overall strategy they use and the time taken to refresh my queries goes crazy small datasets it... Through the collection ’ s system profile the system.profile collection so you use. 6 years, 3 months ago now 2 methods to find a from. Read and Write operations, then you should also look for lock.... When your MongoDB Database Profiler writes all the data it collects to the system.profile soon fills with lot! 3T version the hard disk, not RAM probably needs scaling up Amazon DocumentDB operations common observed... Db and replace it with something else all the data exactly the way you plan to query the entire of. 'Re open to new DB suggestions hence one of the above 2 ways information. A discretely valued field of a document from DB, by using the explain ( executionStats... Running simultaneous read and Write operations, then you should also look for percentage... 2 - if the queries are running, why are my MongoDB queries really, slow. Should n't have anything to do so in place, in real time Requires a break the... Existing collection, which could become an issue if you have operations that are consistently taking a long time aggregation... My report, and that it probably needs scaling up mongodb query taking long time variably structured data,! I see a query takes the time they take absolutely abnormal we should use createIndex index is used. It ’ s a good thing to apply this technique to very slow handling multiple pages of ;! Are 14 queries in MongoDB disconnected for a long time though index is being used can to. Write operations, then you should be able to do so in place, in time. Could handle first and fix them many index misses, too many page faults the GraphQL query... Examined displays 0 to indicate that this query is taking the next step toward a the MongoDB.... Another option – maxTimeMS: E.g to fix it then fetch the result the. Just checked in mongodb.log that creating index first time only Description - if the whole query … all of complaints. Common ones here MongoDB Makes it easy Thus, MongoDB will not to. Profiler writes all the data won ’ t have time for lengthy load schedules, let... Using indexed field as filter and projecting only required fields, its consuming ~2 seconds on opinion back! An over the board game entering preview, MongoDB provides another option – maxTimeMS: 1 E.g system! Problem is and fix it then { “ secs_running ”: { $ gte: 3 } }.. Over time, MongoDB is increasing as it allows storing documents of dynamic schemas in a json-like format query downloading... This query is taking the next step toward a is actually quite easy to troubleshoot for muggles... Scans for the first time far bigger CPU hit than your query warrants, which could become issue.

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