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What are the different types of indexes in MongoDB?
MongoDB involves different types of data hence different types of indexes are derived to support these data types and queries. Using a single field of a document one can make the field an index in an ascending or descending manner just like the example above. Besides, you can create an index on an embedded document as a whole, for example:
How is a MongoDB cluster different from a single server?
In contrast to a single-server MongoDB database, a MongoDB cluster allows a MongoDB database to either horizontally scale across many servers with sharding, or to replicate data ensuring high availability with MongoDB replica sets, therefore enhancing the overall performance and reliability of the MongoDB cluster. What are clusters in MongoDB?
How to calculate the IOPS of a MongoDB cluster?
For frequently accessed documents, you have to know your application’s “hot” data set and do an estimate. Now, to figure out the IOPS for queries, do the following: For deletes, two plus the number of indexes. Total all that out, then subtract out if there will a lot of updates in a short period.
How can I size my MongoDB data set?
There are tools on the internet to help you build data sets to get to 5 to 10 percent of your estimated data size to create the measurements you need. Once you have a collection, you can use db.collection.stats method. It will show you the count, the size of the collection, average document size and how it compresses.
MongoDB supports several different index types including text, geospatial, and hashed indexes. See index types for more information. Changed in version 4.2: MongoDB 4.2 wildcard indexes support workloads where users query against custom fields or a large variety of fields in a collection:
How to create a case insensitive Index in MongoDB?
If you do specify a collation when creating the index, MongoDB creates the index with the specified collation. By specifying a collation strength of 1 or 2, you can create a case-insensitive index. Index with a collation strength of 1 is both diacritic- and case-insensitive.
When does MongoDB create index with default collation?
If you have specified a collation at the collection level, then: If you do not specify a collation when creating the index, MongoDB creates the index with the collection’s default collation. If you do specify a collation when creating the index, MongoDB creates the index with the specified collation.
Is the wildcard INDEX syntax incompatible with MongoDB?
The path-specific wildcard index syntax is incompatible with the wildcardProjection option. You cannot specify additional inclusions or exclusions on the specified path. The wildcard index key must use one of the syntaxes listed above. For example, you cannot specify a compound index key.