If there is a query that filters on field a and b and then order on c, do I need to build separate indexes for a, b, and c, or should I actually build a compound index of (a, b, c)? And also, does the should the sequence in the query match the sequence in the index? that is if the filter sequence in the query is filter b, filter c, and then order on a, then should it better to have compound index of (b, c, a)?
With MongoDB, what are the fields that need to be picked for building indexes on?
208 Views Asked by tom At
2
There are 2 best solutions below
3
Scott Hernandez
On
All of this and more is answered in the docs. See the sections on compound indexes.
The order of the query params doesn't matter.
Related Questions in MONGODB
- MongoDb not connecting C#
- How do I link two models in mongoose?
- MERN Stack App - User Avatar Upload - 500 Error After Deployment on Render
- On the server side, it returns undefined but on the client side, logs the values no problem
- Laravel: Using belongsToMany relationship with MongoDB
- What are some MERN projects that will grow me from junior dev to senior
- Save Interface in DB golang
- findOneAndUpdate not updating value in mongodb?
- Get Type Error when using .countDocuments with mongoDB
- Getting a Large Error Output When Calling MongoDB/Mongoose Functions Without an Error Message
- How to enter data in mongodb array at specific position such that if there is only 2 data in array and I want to insert at 5, then rest data is null
- using Python to insert_one to my mongo_db, How do I pass key values into a function?
- SSL Certificate Verification Error When Scraping Website and Inserting Data into MongoDB
- connect ECONNREFUSED 43.205.72.30:27017 while connecting to Atlas
- Vite is probably changing my import path. What should I do?
Related Questions in INDEXING
- How to give index id to my uploaded json file in FastAPI?
- operator class "gin_trgm_ops" does not exist for access method "gin"
- what is it? my question is what's the meaning of img[img]
- If composite indexing created - indexing is called?
- Autocomplete not working for apache spark in java vscode
- Pyside6, tableView.selectedIndexes, list index out of range
- Indexing in ServiceNow Jelly Report not working
- Wordpress | Page indexing Page is not indexed: Redirect error
- Why does my attempt to print the index of my array ALWAYS return 0.00?
- jQuery - Click and enable Button without affecting other foreach Laravel arrays
- std:array indexing and operator[]
- ChartJS indexing for datapoints
- How to make Postgres GIN index work with jsonb_* functions?
- Using Closing Stock Balance as Opening Stock in subsequent line item
- Using MYSQL optimise table with innodb_optimize_fulltext_only and innodb_ft_num_word_optimize options, how do I know when it's finished?
Related Questions in COMPOUND-INDEX
- Does a compound index without any equality fields (following the ESR rule) perform well in this situation?
- Optimize query and index for mongo $group, $lookup and $count query
- Create Multiple Index Or Create one Compound Index on MongoDb Collection
- Does adding field to sparse index making it compound negate its performance?
- How does Elasticsearch/Lucene achieve such performance when querying multiple fields?
- Mongo Db ESR rule for multiple index keys in a compound index
- MongoDB Compound Index Find then Sort Aggregation Efficiency
- Too many composite(multi column )indexing is ok?
- How to query records in mongoose with schema having compound index with normal field and referenced field?
- mongodb - Multiple Compound Indexes involving a common field
- MariaDB 5.5.68, prevent toxic selects?
- What is the mongo compound index keyword arrangement rule? Numbers first, strings later?
- index not working for the below query.why? mysql version- 8.0.29
- Parse DB/Mongo compound index with an OR and an Object
- Indexeddb compound index IDBKeyRange.bound with nested arrays
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Popular # Hahtags
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
Since MongoDB currently uses only one index per query, you will need a compound index.
The order of the index params does matter, although not necessarily in the way you mention in the question.
Since filtering happens first, if the index was (c,b,a), it wouldn't be very useful for filtering, especially if there are a lot of items in the collection. The fields used for sorting should be specified last in the index.
So the index should either be (a,b,c) or (b,a,c). Which one of those it should be depends on selectivity -- in other words, which field will eliminate items that don't match faster?
If there are 10,000 likely values for b, and only two likely values for a, then the index should be (b,a,c). Conversely, if there are many more possible values for a, then it should probably be (a,b,c). If the two fields are roughly the same in their ability to eliminate documents from the query, then it won't matter that much.