How to diagnose and fix the 0L000 invalid_grantor error code in Postgres.

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The 0L000 invalid_grantor error in PostgreSQL indicates that there is an issue with permissions related to granting rights on a database object. This error means that the user attempting to execute a GRANT statement does not have the appropriate permissions to grant rights to another user or role on the specified object.

To diagnose and fix the 0L000 invalid_grantor error, follow these steps:

  1. Identify the Grantor: The first step is to identify the user or role that is attempting to grant the permissions. This user or role must have the necessary rights to grant permissions on the object in question.
  2. Check Grantor’s Permissions: Verify that the grantor has the correct permissions to grant rights on the object. The grantor needs to have been granted the permissions with the WITH GRANT OPTION clause to be able to grant those permissions to others.
  3. Review Object Ownership: In PostgreSQL, the owner of an object has the inherent right to grant permissions on it. If the grantor is not the owner, ensure that the owner has given the grantor the right to grant permissions on the object.
  4. Correct the Grant Statement: If the grantor has the right permissions, review the GRANT statement for any syntax errors or incorrect object references. Ensure that the object name and the permissions specified in the statement are correct.
  5. Grant Permissions to the Grantor: If the grantor does not have the necessary permissions, you will need to have a superuser or the owner of the object grant those permissions to the grantor with the WITH GRANT OPTION.
  6. Use Superuser Account: If all else fails, a superuser account can be used to grant permissions as superusers have all privileges by default.

Here are some examples of how to fix the error:

  • If the user alice is trying to grant permissions but is encountering the 0L000 invalid_grantor error, the owner of the object or a superuser needs to grant alice the appropriate permissions with the WITH GRANT OPTION:
  GRANT SELECT ON my_table TO alice WITH GRANT OPTION;
  • If alice is the owner of the object, the error might be due to a syntax mistake in the GRANT statement. Ensure that the statement is correct:
  GRANT SELECT ON my_table TO bob;

For more detailed information about PostgreSQL error codes, including 0L000, you can refer to the PostgreSQL documentation on error codes. Remember that the specific steps to resolve the issue may vary depending on the context of the error and the database’s configuration.

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