Answer / Asit Kumar

In MongoDB, you can use multi-document transactions for maintaining data consistency across multiple documents. This feature is available since MongoDB version 3.6. To perform a transaction, wrap your operations inside a try block and catch exceptions for any errors that might occur. You should use the 'beginTransaction', 'getCommitTimestamp' or 'startSession' methods to start a session, and 'commitTransaction' or 'endSession' to commit changes. For locking, MongoDB uses MVCC (Multi-Version Concurrency Control) which allows multiple operations to work concurrently without causing conflicts.

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