Which of the following is supported by MongoDB?

Question

Options

• ATransaction Management
• BACID Transactions
• CJournaling
• DRelationships between Collections (Primary Key Foreign Key)

• A
  5% (1)
• C
  89% (17)
• D
  5% (1)

Explanation

Journaling is a core MongoDB feature where write operations are recorded to an on-disk journal before being applied to data files, enabling crash recovery and data durability - this has been part of MongoDB since early versions.

Why the distractors are wrong:

• A (Transaction Management) - MongoDB traditionally lacks multi-document transaction management in the relational DBMS sense; its design prioritizes document-level atomicity instead. (Multi-document transactions were added in v4.0, but classic exam questions predate this.)
• B (ACID Transactions) - MongoDB is generally classified as a BASE (Basically Available, Soft state, Eventually consistent) system, not ACID-compliant in the traditional relational sense, especially across multiple documents or collections.
• D (Relationships via PK/FK) - MongoDB is a NoSQL document store; it does not enforce referential integrity or Primary Key/Foreign Key constraints between collections. References between documents are by convention, not enforced by the database.

Memory tip: Think of MongoDB's journal like a "flight recorder" - it logs every operation so the database can replay or undo writes after a crash. The other options (ACID, transactions, FK relationships) are hallmarks of relational databases like MySQL or PostgreSQL, not document stores like MongoDB.

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