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How to fix MongoDB Error Code – 20 – IllegalOperation

How to Fix MongoDB Error Code – 20 – IllegalOperation

MongoDB is a popular open-source NoSQL database that offers high performance, scalability, and flexibility. However, like any software, it can encounter errors that can disrupt its normal operation. One such error is MongoDB Error Code – 20, also known as IllegalOperation. In this article, we will explore the causes of this error and provide solutions to fix it.

Understanding MongoDB Error Code – 20

MongoDB Error Code – 20 occurs when an operation is not allowed or is considered illegal. This error can be triggered by various actions, such as attempting to perform unauthorized operations, accessing restricted resources, or executing invalid commands.

When this error occurs, MongoDB returns an error message similar to the following:

WriteError({"code":20,"codeName":"IllegalOperation","errmsg":"Cannot create namespace usavps.users in multi-document transaction."})

Possible Causes of MongoDB Error Code – 20

There are several potential causes for MongoDB Error Code – 20:

  • Unauthorized Operations: If the user does not have the necessary privileges to perform a specific operation, MongoDB will return Error Code – 20.
  • Invalid Commands: Executing invalid commands or using unsupported options can trigger this error.
  • Accessing Restricted Resources: MongoDB may restrict access to certain resources, such as system collections or databases, which can result in Error Code – 20.
  • Multi-Document Transactions: Certain operations, such as creating namespaces, are not allowed within multi-document transactions, leading to this error.

Fixing MongoDB Error Code – 20

To resolve MongoDB Error Code – 20, consider the following solutions:

1. Check User Privileges

Ensure that the user performing the operation has the necessary privileges. Grant the required roles and permissions to the user using the MongoDB db.grantRolesToUser() command.

use admin
db.grantRolesToUser("username", [{ role: "roleName", db: "databaseName" }])

2. Verify Command Syntax

Double-check the syntax of the command you are executing. Make sure it follows the correct format and includes all the required parameters. Refer to the MongoDB documentation for the specific command you are using.

3. Avoid Restricted Resources

If you are encountering Error Code – 20 when accessing certain resources, ensure that you have the necessary permissions to access them. Some resources may be restricted to specific users or roles.

4. Avoid Multi-Document Transactions

If you are performing operations within a multi-document transaction and encountering Error Code – 20, consider restructuring your code to avoid creating namespaces or performing other restricted operations within the transaction.

Summary

MongoDB Error Code – 20, also known as IllegalOperation, occurs when an operation is not allowed or is considered illegal. This error can be triggered by unauthorized operations, invalid commands, accessing restricted resources, or performing restricted operations within multi-document transactions.

To fix MongoDB Error Code – 20, ensure that the user has the necessary privileges, verify the command syntax, avoid restricted resources, and avoid performing restricted operations within multi-document transactions.

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