In MongoDB, a document is a basic unit of data storage and retrieval. It is a JSON-like data structure that consists of field-value pairs. A document can contain nested sub-documents and arrays, making it a flexible and powerful way to represent data. Each document is stored in a collection, which is similar to a table in relational databases. Documents in MongoDB are schema-less, meaning that each document in a collection can have a different structure. This flexibility allows for easy and efficient data manipulation and querying. Overall, a document in MongoDB is a fundamental building block for storing and organizing data in a NoSQL database.
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What is the role of document-level access control in MongoDB?
Document-level access control in MongoDB allows for granular control over who has access to specific documents within a collection. This means that administrators can set permissions at the document level, defining which users or roles are allowed to read, write, or perform other operations on individual documents. This provides a higher level of security and control, allowing for fine-grained access control based on specific data within the database. This helps organizations comply with data privacy regulations and ensures that sensitive information is only accessible to authorized individuals.
What is considered as a nested document in MongoDB?
A nested document in MongoDB is when a document (or record) within a collection contains another document as one of its fields. This nested document can have its own fields and values, creating a hierarchical or tree-like structure within a single document. This nesting can go multiple levels deep, allowing for complex and structured data models in MongoDB databases.
What is the difference between a document and a collection in MongoDB?
In MongoDB, a document is a single unit of data stored in a collection, which is analogous to a row in a relational database. A document is represented as a JSON-like object in MongoDB and can contain multiple key-value pairs.
A collection is a group of documents in MongoDB, similar to a table in a relational database. Collections do not enforce a schema, meaning that each document in a collection can have different fields and structure. Collections are used to organize related documents and provide a way to query and manipulate multiple documents at once.
In summary, a document is a single data record in MongoDB, while a collection is a grouping of related documents.
What is a document array in MongoDB?
In MongoDB, a document array is an array field that contains one or more documents within a single document. This allows for nesting multiple documents within a single document, creating a more complex data structure. Document arrays are commonly used to store related data in a structured format, such as storing comments on a post or attributes of a product. They provide flexibility in data modeling and enable efficient querying and manipulation of nested data.
What is an embedded document in MongoDB?
An embedded document in MongoDB is a document or data structure that is stored inside another document. This allows for complex and nested data structures to be represented within a single document. Embedded documents are commonly used to model one-to-many or parent-child relationships in MongoDB, as well as to store related data in a single location for improved performance and simplicity of querying.
