Resolving #1273 Error in phpMyAdmin: Unknown Collation ‘utf8mb4_0900_ai_ci’ on

If you’ve encountered the #1273 error while trying to upload an SQL file in phpMyAdmin on, you’re not alone. This error is related to an unknown collation (‘utf8mb4_0900_ai_ci’) and can be a bit perplexing for users. In this blog post, we will delve into the root of the issue and provide you with a comprehensive guide on how to fix it.

Understanding the #1273 Error:

The #1273 error usually occurs when the collation used in the SQL file is not recognized by the MySQL server. The ‘utf8mb4_0900_ai_ci’ collation is a part of MySQL’s utf8mb4 character set, introduced for better Unicode support. However, not all servers are configured to recognize this collation by default, leading to the error.

Steps to Fix the Error:

  1. Check MySQL Version:
    Before making any changes, ensure that your MySQL server version is compatible with the ‘utf8mb4_0900_ai_ci’ collation. It is recommended to use MySQL version 5.7.7 or later.
  2. Update phpMyAdmin:
    Ensure that you are using the latest version of phpMyAdmin. Developers often release updates to address compatibility issues and bugs. Upgrading phpMyAdmin might resolve the collation problem.
  3. Modify Collation in SQL File:
    Open the SQL file causing the error in a text editor. Look for the line where the ‘utf8mb4_0900_ai_ci’ collation is specified. Change it to a more widely supported collation, such as ‘utf8mb4_general_ci’ or ‘utf8_general_ci’.
  4. Use a Different Database Client:
    If the issue persists, consider using a different MySQL database client. Sometimes, certain clients have better compatibility with specific collations.
  5. Adjust MySQL Server Configuration:
    Log in to your MySQL server and check the default collation settings. Adjust them to include support for ‘utf8mb4_0900_ai_ci’. You may need to consult your hosting provider or server administrator for assistance with this step.
  6. Convert Database to utf8mb4:
    Convert your entire database to use the ‘utf8mb4_general_ci’ or ‘utf8_general_ci’ collation. You can do this using SQL queries, or you might find tools provided by your hosting provider to be helpful.
  7. Check Server Variables:
    Verify that the server’s character set and collation variables are correctly configured. Use the following SQL queries to check and update them if necessary:
   SHOW VARIABLES LIKE 'character_set%';
   SHOW VARIABLES LIKE 'collation%';

Update the variables using:

   SET GLOBAL character_set_server = 'utf8mb4';
   SET GLOBAL collation_server = 'utf8mb4_general_ci';
  1. Contact Hosting Support:
    If all else fails, reach out to your hosting provider’s support team. They may be able to assist you in adjusting server configurations or providing insights specific to their environment.

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Resolving the #1273 error in phpMyAdmin related to the ‘utf8mb4_0900_ai_ci’ collation may require a combination of SQL file adjustments, server configuration changes, and, in some cases, assistance from your hosting provider. By following the steps outlined in this guide, you should be able to tackle the issue and successfully upload your SQL file on If you encounter any challenges, don’t hesitate to seek support from your hosting provider for a swift resolution.

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