MongoDB · January 2, 2024

How to fix MongoDB Error Code - 206 - NoSuchSession

How to Fix MongoDB Error Code - 206 - NoSuchSession

MongoDB is a popular NoSQL database that offers high performance, scalability, and flexibility. However, like any software, it can encounter errors that need to be resolved. One such error is the MongoDB Error Code - 206 - NoSuchSession. In this article, we will explore the causes of this error and provide step-by-step solutions to fix it.

Understanding MongoDB Error Code - 206 - NoSuchSession

The MongoDB Error Code - 206 - NoSuchSession occurs when a session specified in an operation does not exist or has expired. This error typically happens when a session is explicitly closed or when the session timeout period is exceeded.

When this error occurs, you may see an error message similar to the following:

com.mongodb.MongoCommandException: Command failed with error 206 (NoSuchSession): 'Invalid operation: This session has been ended and cannot be used anymore.' on server localhost:27017.

Possible Causes of MongoDB Error Code - 206 - NoSuchSession

There are several reasons why you might encounter the MongoDB Error Code - 206 - NoSuchSession:

  • Explicitly closing the session: If you explicitly close a session using the session.endSession() method, any subsequent operations using that session will result in the NoSuchSession error.
  • Session timeout: MongoDB sessions have a default timeout period. If a session remains idle for longer than this timeout period, it will expire, and any subsequent operations using that session will trigger the NoSuchSession error.
  • Using an expired session: If you attempt to use a session that has already expired, MongoDB will throw the NoSuchSession error.

Fixing MongoDB Error Code - 206 - NoSuchSession

To fix the MongoDB Error Code - 206 - NoSuchSession, you can follow these steps:

1. Check session management

Ensure that you are managing your sessions correctly. Avoid explicitly closing a session if you intend to use it for subsequent operations. If you need to close a session, make sure to create a new session for further operations.

2. Increase session timeout

If your sessions are expiring too quickly, you can increase the session timeout period. You can do this by setting the maxIdleTimeMS option when creating a session. For example:

const session = db.getMongo().startSession({ maxIdleTimeMS: 600000 }); // 10 minutes

This will set the session timeout to 10 minutes (600,000 milliseconds).

3. Handle expired sessions gracefully

If you encounter the NoSuchSession error, handle it gracefully in your code. You can catch the error and take appropriate action, such as creating a new session and retrying the operation.

Summary

In conclusion, the MongoDB Error Code - 206 - NoSuchSession occurs when a session specified in an operation does not exist or has expired. To fix this error, ensure proper session management, increase the session timeout if necessary, and handle expired sessions gracefully in your code.

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