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How To Upgrade to MySQL 8.0 on Ubuntu Server 18.04?

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In this comprehensive guide, we will walk you through the process of upgrading to MySQL 8.0 on Ubuntu Server 18.04. MySQL is a popular open-source relational database management system. An upgrade to MySQL 8.0 can provide enhanced performance, security, and a host of new features.

Quick Answer

To upgrade to MySQL 8.0 on Ubuntu Server 18.04, you need to first back up your database using the mysqldump command. Then, uninstall the existing MySQL version using commands like sudo apt remove mysql-*. After that, download and install the MySQL APT configuration package, select version 8.0 during installation, and install MySQL using sudo apt install mysql-server. Finally, run the mysql_upgrade command to upgrade your existing databases if necessary.

Preparing for the Upgrade

Before initiating the upgrade process, it’s crucial to back up your database. This is to ensure that you don’t lose any important data in case something goes wrong during the upgrade. You can use the mysqldump command to create a backup of your database:

$ mysqldump -u root -p --all-databases > alldb_backup.sql

In this command, -u specifies the username (in this case, root), -p prompts for the password, and --all-databases indicates that you want to back up all databases.

Uninstalling the Existing MySQL Version

The next step is to stop the MySQL service and remove any existing MySQL packages from your system. You can do this using the following commands:

$ sudo systemctl stop mysql
$ sudo apt remove mysql-*
$ sudo apt purge mysql-*
$ sudo apt autoremove
$ sudo dpkg -l | grep mysql | grep ii

In these commands, systemctl stop is used to stop the MySQL service, apt remove and apt purge are used to remove the MySQL packages and their configurations, and dpkg -l | grep mysql | grep ii is used to verify that all MySQL packages have been removed.

Installing MySQL 8.0

Now that the existing MySQL version has been removed, you can proceed to install MySQL 8.0. First, you need to download and install the MySQL APT configuration package, which will add the MySQL repository and key to your system:

$ wget https://repo.mysql.com//mysql-apt-config_0.8.12-1_all.deb
$ sudo dpkg -i mysql-apt-config_0.8.12-1_all.deb

In the wget command, the URL is the download link for the MySQL APT configuration package. The dpkg -i command is used to install the downloaded package.

During the installation, a prompt will ask you to choose the MySQL version you want to install. Make sure to select version 8.0.

Next, update the repository and install MySQL by running the following commands:

$ sudo apt update
$ sudo apt install mysql-server

In these commands, apt update updates the package lists for upgrades, and apt install installs the MySQL server.

After the installation is complete, MySQL 8.0 should be installed on your system. You can verify this by running the command mysql --version.

Post-Installation Steps

If you are upgrading from MySQL 5.7 to 8.0, you may need to run the mysql_upgrade command to upgrade your existing databases. This command checks all tables in all databases for incompatibilities with the new MySQL version and repairs them if necessary. You can run this command as follows:

$ sudo mysql_upgrade -u root -p

In this command, -u specifies the username and -p prompts for the password.

For more information on the upgrade process, you can refer to the official MySQL documentation here.

Conclusion

Upgrading to MySQL 8.0 on Ubuntu Server 18.04 involves several steps, including backing up your database, removing the existing MySQL version, and installing the new version. By following this guide, you should be able to successfully upgrade your MySQL version and take advantage of the new features and improvements in MySQL 8.0.

What are the benefits of upgrading to MySQL 8.0?

Upgrading to MySQL 8.0 can provide enhanced performance, improved security features, and access to new features such as window functions, common table expressions, and better JSON support.

How can I back up my database before upgrading?

You can use the mysqldump command to create a backup of your database. Here is an example command: $ mysqldump -u root -p --all-databases > alldb_backup.sql. This command will create a backup of all databases and save it to a file named "alldb_backup.sql".

How do I uninstall the existing MySQL version?

To uninstall the existing MySQL version, you need to stop the MySQL service and remove the MySQL packages from your system. Here are the commands you can use:

$ sudo systemctl stop mysql
$ sudo apt remove mysql-*
$ sudo apt purge mysql-*
$ sudo apt autoremove
$ sudo dpkg -l | grep mysql | grep ii
How do I install MySQL 8.0?

After uninstalling the existing MySQL version, you can proceed to install MySQL 8.0. First, download and install the MySQL APT configuration package using the following commands:

$ wget https://repo.mysql.com//mysql-apt-config_0.8.12-1_all.deb
$ sudo dpkg -i mysql-apt-config_0.8.12-1_all.deb

During the installation, you will be prompted to choose the MySQL version. Make sure to select version 8.0. Then, update the repository and install MySQL with these commands:

$ sudo apt update
$ sudo apt install mysql-server
How can I verify if MySQL 8.0 is installed?

You can verify if MySQL 8.0 is installed by running the command mysql --version. This command will display the MySQL version installed on your system.

Is it necessary to run `mysql_upgrade` after upgrading to MySQL 8.0?

If you are upgrading from MySQL 5.7 to 8.0, it is recommended to run the mysql_upgrade command. This command checks all tables in all databases for incompatibilities with the new MySQL version and repairs them if necessary. You can run this command using the following command: $ sudo mysql_upgrade -u root -p.

Where can I find more information on the upgrade process?

For more information on the upgrade process, you can refer to the official MySQL documentation here. The documentation provides detailed instructions and considerations for upgrading MySQL.

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