Mar 16, 2012 · Mongodb has wildcard indexes that allow you to create an index for a field that contains varying keys. From the documentation: If the field is a nested document or array, the …

Apr 26, 2012 · To quote the docs: When creating an index, the number associated with a key specifies the direction of the index, so it should always be 1 (ascending) or -1 (descending). …

MongoDB cannot create a unique index on the specified index field (s) if the collection already contains data that would violate the unique constraint for the index.

Jan 27, 2016 · Is there a command that i can use via javascript in mongo shell that can be used to check if the particular index exists in my mongodb. I am building a script file that would create …

Nov 5, 2015 · According to MongoDB docs on Compound Indexes. MongoDB supports compound indexes, where a single index structure holds references to multiple fields within a collection’s …

I'm wondering how sorting with an index actually works in MongoDB. There are a couple articles in the MongoDB documentation, but they don't actually describe how the sort proceeds or the …

May 11, 2018 · I want to create an Index on Mongo database for performance perspective, so could you please help me how I can do it? Your help will be appreciated here.

Dec 3, 2013 · As of June 2022 the index CANNOT be used for ${exists: true} case and CAN BE ONLY PARTIALLY used for the half of other cases. There is a major (IMO) design bug with …

Oct 30, 2010 · How does MongoDB index arrays? Asked 14 years, 10 months ago Modified 7 years, 5 months ago Viewed 70k times

I'm using MongoDB and have a collection with roughly 75 million records. I have added a compound index on two "fields" by using the following command: …