Which command is used to commit a transaction in MongoDB's shell (mongosh)?

The command used to commit a transaction in MongoDB's shell (mongosh) is session.commitTransaction(). This method is specifically designed to finalize a transaction that has been initiated and ensure that all operations in that transaction are applied to the database.

In MongoDB, transactions allow multiple operations to be executed as a single unit of work. After performing the necessary operations within a session and ensuring that all conditions for committing are met (like maintaining ACID principles), calling session.commitTransaction() will save all changes made during that session to the database.

The alternative options do not represent valid methods for committing transactions. The other commands referenced are not part of the MongoDB session API or do not properly correspond to the mechanism by which transactions are committed in the MongoDB environment. Understanding this command is crucial for ensuring data integrity and managing multi-document transactions effectively in MongoDB.