MySQL Upgrade from 8.0.4 to 8.4.x (Ubuntu)

This article provides step-by-step instructions to upgrade MySQL from version 8.0.4 to 8.4.x. It covers prerequisites, pre-upgrade checks, installation steps, post-upgrade validations, and rollback procedures to ensure a safe and production-ready upgrade.

Prerequisites

OS Compatibility
- Confirm the operating system supports MySQL 8.4.
- Recommended: Ubuntu 22.04 LTS or later.
- Check OS version:
  cat /etc/os-release
System Requirements
- Disk space: Sufficient for backups and rollback
- Memory: Minimum 16 GB RAM
- Access: Root or sudo privileges

Pre-Upgrade Checks

Backup

Logical backup:

mysqldump -u root -p ovaledgedb > /home/ubuntu/mysql_backup/ovaledgedb_backup.sql

Ensure you use the correct schema.

Physical backup (recommended):
- Use Percona XtraBackup or filesystem-level copy.

Backup configuration files:

sudo cp /etc/mysql/mysql.conf.d/mysqld.cnf /home/ubuntu/mysql_backup/
sudo cp -a /var/lib/mysql /home/ubuntu/mysql_backup/

Collect Pre-Upgrade Database Information

Database size query:

SELECT 
    table_schema AS "Database Name", 
    ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) AS "DB Size (MB)"
FROM information_schema.tables 
GROUP BY table_schema;

Row count query: [Download Query File]
Save query outputs for post-upgrade validation.

Upgrade Execution

Stop MySQL Service
```
sudo systemctl stop mysql
```
Download MySQL APT Repository

Update package manager repo i,e, using deb packages for ubuntu.

cd
wget https://dev.mysql.com/get/mysql-apt-config_0.8.33-1_all.deb

Update Repository Update the deb packages as shown below.
```
sudo dpkg -i mysql-apt-config_0.8.33-1_all.deb
```
- Select the highlighted package below and hit Enter.
- Select MySQL 8.4 LTS when prompted.
- Confirm selections and continue.
- Finally you will get below screen,
Update Packages Update the apt package repository.
```
sudo apt update -y
```
Upgrade MySQL Server Run the following command to upgrade the MySQL server:
```
sudo apt-get install mysql-server
```
Update Configuration Open the MySQL configuration file:
```
sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf
```
Add:
```
mysql_native_password=ON
```
Save file and restart MySQL
```
sudo systemctl restart mysql
```
Verify Version
```
mysql --version
```

Post-Upgrade Validations

Row Count Verification
```
mysql -u root -p
```
Run [Row Count Query] and compare results with pre-upgrade counts.

Database Size Verification

SELECT 
    table_schema AS "Database Name", 
    ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) AS "DB Size (MB)"
FROM information_schema.tables 
GROUP BY table_schema;

Compare with pre-upgrade values.

Update MySQL Parameters Edit /etc/mysql/mysql.conf.d/mysqld.cnf and add:

max_binlog_size=1GB
binlog_expire_logs_seconds=2592000
group_concat_max_len=50000
max_connections=600
innodb_buffer_pool_size=10GB
max_allowed_packet=1G
bind-address=0.0.0.0

Adjust values based on instance size. Restart MySQL:

sudo systemctl restart mysql

Update OvalEdge User Password

ALTER USER 'ovaledge'@'localhost' IDENTIFIED BY '<Password>';
ALTER USER 'ovaledge'@'%' IDENTIFIED BY '<Password>';
FLUSH PRIVILEGES;

Check Logs
```
tail -n 100 /var/log/mysql/error.log
```
Once validations are complete, point the OvalEdge application to MySQL 8.4.

Rollback Plan (If Needed)

Back up MySQL configuration and data directory:

sudo cp /etc/mysql/mysql.conf.d/mysqld.cnf /home/ubuntu/mysql8.4_backup/
sudo cp -a /var/lib/mysql /home/ubuntu/mysql8.4_backup/

Stop MySQL service.
Reinstall MySQL 8.0.4.
Restore data from backups.

Additional Information

Test MySQL 8.4 installation in a separate folder before applying in production.
Example: MySQL 8.4.4 installation in a separate folder on Ubuntu.

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Last updated 2 months ago

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