Knowledge Base

This error usually occurs due to improper shutdown or corrupted MySQL database files. Follow these steps carefully to resolve the issue:

1. Understanding the Error

• The MySQL service stops unexpectedly when attempting to start it and displays an error message.
• This is often caused by corrupted MySQL data files or an unexpected interruption.

2. Backing Up Database Files

1. Navigate to your XAMPP installation directory (e.g., C:\xampp).
2. Go to the mysql\data folder.
3. Backup all files and subfolders by copying them to another folder (e.g., mysql_backup).

3. Repairing Corrupted Database Files

1. Clean the mysql\data Folder:

   • Delete all files except for ibdata1 in the mysql\data folder.
   • Do not delete the ibdata1 file! This file contains critical information about your tables and database structure.

2. Restore Backup Files:

   • Copy only the non-corrupted files from your backup into the mysql\data folder.
   • Avoid adding previously corrupted files to prevent recurring issues.

4. Restarting the MySQL Service

• Open the XAMPP control panel.
• Try starting the MySQL service. If the error persists, proceed to the next steps.

5. Checking phpMyAdmin and Performance Schema

1. Check the phpMyAdmin Folder:

   • Navigate to C:\xampp\phpMyAdmin and delete the folder if necessary.
   • Recreate it by downloading a fresh copy from XAMPP or restoring it from a clean installation.

2. Ensure Performance Schema Exists:

   • Verify the existence of the performance_schema folder in mysql\data.
   • If missing, copy it from a clean XAMPP installation.

6. Resolving Errors and Testing

1. Restart the MySQL service in the XAMPP control panel.
2. If no errors occur, open phpMyAdmin and check all databases.
3. Restore any missing or corrupted databases as needed.

Important Notes

• Always back up files before deleting or modifying anything.
• Deleting the ibdata1 file will result in the loss of all databases.
• If these steps don’t work, consider reinstalling XAMPP as a last resort.

This guide provides a comprehensive approach to resolving the "MySQL shutdown unexpectedly" error. If the issue persists, examine the error logs for additional details and troubleshoot accordingly.