======Overview======
MySQL upgrade is fairly easy and it is mostly done by updating the RPMs, this can be accomplished either via:

  * Using YUM/DNF repository
  * APT Repository
  * Directly downloaded RPM packages


We will use the YUM approach:


====Updating the RPMs====
The RPMs are updated as normally via the following command:

<sxh bash>
yum update mysql-server
</sxh>

After the packages are updated you can check the latest which were installed:


<sxh bash>
[root@stage-db software]# yum list installed | grep mysql
mysql-community-client.x86_64    5.7.21-1.el7                 @mysql57-community
mysql-community-common.x86_64    5.7.21-1.el7                 @mysql57-community
mysql-community-libs.x86_64      5.7.21-1.el7                 @mysql57-community
mysql-community-libs-compat.x86_64
                                 5.7.21-1.el7                 @mysql57-community
mysql-community-server.x86_64    5.7.21-1.el7                 @mysql57-community
mysql-connector-python.x86_64    2.1.7-1.el7                  @mysql-connectors-community
mysql-utilities.noarch           1.6.5-1.el7                  @mysql-tools-community
mysql57-community-release.noarch el7-10                       @mysql57-community
[root@stage-db software]#
</sxh>


====Running the postupdate script====
After the RPM has been updated and the mysql restart, you have to run the mysql_upgrade script in order to recompile, if needed, the tables/views/procedures to affect the recent changes.


<sxh bash>
[root@stage-db software]# mysql_upgrade -uroot -p
Enter password:
Checking if update is needed.
***************************************************************
vdepta.sys_payment_methods                         OK
vdepta.sys_results_btypes                          OK
vdepta.sys_server_status_logs                      OK
vdepta.sys_templates                               OK
vdepta.sys_trading_hours                           OK
vdepta.sys_user_ips                                OK
vdepta.sys_user_sessions                           OK
vdepta.sys_user_sessions_backup                    OK
vdepta.sys_user_types                              OK
vdepta.sys_users                                   OK
vdepta.sys_users_activation                        OK
vdepta.sys_users_info                              OK
Upgrade process completed successfully.
Checking if update is needed.
</sxh>

Once the script has been executed feel free to re-run the command so you can check if everything is OK:

<sxh bash>
[root@stage-db software]# mysql_upgrade -uroot -p
Enter password:
Checking if update is needed.
This installation of MySQL is already upgraded to 5.7.21, use --force if you still need to run mysql_upgrade
[root@stage-db software]#
</sxh>