How are MongoDB collections named?
The general conventions are: Lowercase names: this avoids case sensitivity issues, as MongoDB collection names are case sensitive. Plural: more obvious to label a collection of something as the plural, e.g. “files” rather than “file”
What is the default collection name in MongoDB?
A number of databases can be run on a single MongoDB server. Default database of MongoDB is ‘db’, which is stored within data folder.
How do I find the number of collections in MongoDB?
Description. n = count( conn , collection ) returns the total number of documents in a collection by using the MongoDB connection. n = count( conn , collection ,’Query’, mongoquery ) returns the total number of documents in an executed MongoDB query on a collection.
What is collection ID in MongoDB?
Every document in the collection has an “_id” field that is used to uniquely identify the document in a particular collection it acts as the primary key for the documents in the collection. “_id” field can be used in any format and the default format is ObjectId of the document.
What is collection name?
The collection name is the value that is associated with the CollectionName attribute in the message collection tree structure. Each message collection has only one name.
Should MongoDB collection names be plural?
Collections: plural in lower case: images, resumes, Document fields: lowerCamelCase, e.g. memberFirstName, fileName, etc.
What is collection in MongoDB Mcq?
A collection and a document in MongoDB is equivalent to Table and Row concepts respectively.
How do I open a collection in MongoDB?
Use show collections command from MongoDB shell to list all collections created in the current database. First, select the database you want to view the collection.
How do I rename a collection name in MongoDB compass?
Change the collection name in the MongoDB In MongoDB, you can use the renameCollection() method to rename or change the name of an existing collection. The new name of the collection. Optional, if true then mongod drops the target of renameCollection former to renaming the collection. The default value is false.
How to create a collection in MongoDB?
MongoDB is a schema-less database so it can store any number of fields to the documents. Users can create n number of documents into the collection, or it can be changed at any time and no need to make changes in the MongoDB database. To create a collection, we should insert Document into it, and it must have fields name and field value.
What is the use of MongoDB?
MongoDB is a schema-less database so it can store any number of fields to the documents. Users can create n number of documents into the collection, or it can be changed at any time and no need to make changes in the MongoDB database.
What if collation is not specified in MongoDB?
If the collation is unspecified but the collection has a default collation (see db.createCollection () ), the operation uses the collation specified for the collection. If no collation is specified for the collection or for the operations, MongoDB uses the simple binary comparison used in prior versions for string comparisons.
What happened to cursor and collection count() in MongoDB?
MongoDB drivers compatible with the 4.0 features deprecate their respective cursor and collection count () APIs in favor of new APIs for countDocuments () and estimatedDocumentCount () . For the specific API names for a given driver, see the driver documentation.