What is the "COLLSCAN" stage in `explain()`? What is the "FETCH" stage in `explain()`?

Working with MongoDB TTL (Time-To-Live) Index. MongoDB 2.2 or higher supports TTL (Time-To-Live) indexes. TTL Monitor is a separate thread that runs ... May 26, 2019 ... Indexes store references to fields in either ascending (1) or descending (-1) sort order. For single-field indexes, the sort order of keys doesn ... Aug 14, 2024 ... This article focuses on how to add indexes using Azure Cosmos DB for MongoDB. Indexes are specialized data structures that make querying your data roughly an ... Dec 9, 2024 ... How to create an index, and how to modify templates for generated index and key names ... For MongoDB, indexes are supported for database versions ... Mar 17, 2021 ... MongoDB indexes are crucial in optimizing database performance, as they improve the speed of data retrieval operations in a MongoDB database. This community-maintained MongoDB extension supports the MongoDB change ... Drop an index for a collection by keys.

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what is index in mongodb

• How does the query planner choose an index? What are the different stages in an `explain()` output related to indexing?
• What are the key metrics to monitor to detect indexing-related performance problems? How can you use MongoDB Atlas to monitor and optimize your indexes?
• How do you use aggregation pipeline stages like `$indexStats` to analyze index usage?
• How does online index rebuilding work in MongoDB? What are the considerations and potential impact of online index rebuilding?
• Can you index arrays in MongoDB?
• What is the working set and how does it relate to indexing? How does the amount of RAM available affect MongoDB's ability to use indexes effectively?
• What are the best resources for learning more about MongoDB indexing? Can you use regular expressions in queries with indexes?
• How do you optimize indexes for specific aggregation pipeline patterns? What are the best practices for indexing in a globally distributed MongoDB Atlas cluster?
• What are the considerations for indexing large volumes of geospatial data?
• How do you create and manage custom analyzers for text indexes?