Understanding and Changing MySQL Character Set and Collation

Overview

This guide explains what MySQL character sets and collations are, how to identify the current settings, and how to change them using phpMyAdmin.

What are Character Sets and Collations?

Character Set (Charset)

A character set is a collection of symbols and encodings that determines which characters can be stored in your database. It defines how text data is encoded and stored.

Common Character Sets:

• utf8mb4 - Supports full UTF-8 encoding including emojis and special characters (recommended)
• utf8 - Basic UTF-8 encoding (older, limited emoji support)
• latin1 - Basic Latin characters only
• ascii - Basic ASCII characters

Collation

Collation determines how characters are compared and sorted in your database. It affects sorting order, case sensitivity, and accent sensitivity.

Common Collations:

• utf8mb4_unicode_ci - Unicode-based, case-insensitive (recommended)
• utf8mb4_general_ci - General purpose, case-insensitive
• utf8mb4_bin - Binary comparison, case-sensitive

Default Settings on iFastNet

iFastNet typically uses these default settings:

• Character Set: utf8mb4
• Collation: utf8mb4_unicode_ci

These are modern, recommended settings that support international characters and emojis.

Accessing phpMyAdmin

You can access phpMyAdmin through your cPanel:

1. Login to the iFastNet client portal at: https://ifastnet.com/portal/clientarea.php
2. Or use direct cPanel access at: https://yourdomain.com/cpanel (replace with your domain)
3. In cPanel, scroll to the Databases section
4. Click on phpMyAdmin

Need Support? Create a support ticket at: https://support.ifastnet.com/login.php Note: First-time users will need to register an account to create tickets.

Checking Current Character Set and Collation

For the Entire Database

1. In phpMyAdmin, click on your database name in the left sidebar
2. Click the Operations tab at the top
3. Look for the Collation section
4. The current settings will be displayed here

For Individual Tables

1. Click on your database name in the left sidebar
2. You'll see a list of tables with their collation settings
3. Each table shows its current collation in the Collation column

For Individual Columns

1. Click on a table name
2. Click the Structure tab
3. Each column shows its collation in the Collation column

Changing Character Set and Collation

?? Important Warnings

• Always backup your database before making changes
• Test changes on a staging site first
• Changing collation may affect existing data sorting
• Some applications may require specific character sets

Method 1: Change Database Default

1. In phpMyAdmin, select your database
2. Click the Operations tab
3. In the Collation section:
   • Select your desired collation from the dropdown
   • Common choice: utf8mb4_unicode_ci
4. Click Go

Note: This only affects NEW tables created after the change.

Method 2: Change Existing Table

1. Click on the table you want to modify
2. Click the Operations tab
3. In the Table options section:
   • Find the Collation dropdown
   • Select your desired collation
4. Click Go

Method 3: Change All Tables at Once

1. Select your database
2. Click the SQL tab
3. Use this SQL command (replace your_database_name and choose your collation):

-- Change database default
ALTER DATABASE your_database_name CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- Change all tables (example for common table names)
ALTER TABLE wp_posts CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE wp_postmeta CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE wp_users CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

4. Click Go to execute

Method 4: Change Individual Columns

1. Click on a table
2. Click the Structure tab
3. Click Change next to the column you want to modify
4. In the Collation dropdown, select your desired setting
5. Click Save

Recommended Settings

For WordPress Sites

• Character Set: utf8mb4
• Collation: utf8mb4_unicode_ci

For E-commerce Sites

• Character Set: utf8mb4
• Collation: utf8mb4_unicode_ci (supports international customer names and addresses)

For Multilingual Sites

• Character Set: utf8mb4
• Collation: utf8mb4_unicode_ci (best support for multiple languages)

Verifying Changes

After making changes:

1. Check the Operations tab to confirm database-level changes
2. Review table list to verify table-level changes
3. Test your website functionality
4. Check that special characters display correctly
5. Verify sorting works as expected

Troubleshooting

Common Issues

• Broken characters after change: Your data may have been corrupted during conversion
• Website errors: Some applications expect specific character sets
• Sorting problems: Different collations sort characters differently

Solutions

1. Restore from backup if you encounter major issues
2. Contact iFastNet support for assistance with complex database changes
3. Test thoroughly before applying changes to production sites

When to Change Settings

You Should Change If:

• You need to store emojis and your current charset doesn't support them
• You're experiencing character encoding issues
• You're migrating from an older system with outdated settings
• Your application specifically requires certain settings

You Should NOT Change If:

• Your current setup is working fine
• You're unsure about the implications
• Your application documentation specifies different requirements

Summary

• Character sets define which characters can be stored
• Collations determine how characters are compared and sorted
• utf8mb4 with utf8mb4_unicode_ci are the recommended modern settings
• Always backup before making changes
• Test thoroughly after any modifications