Stopping com.mysql.mysqld from launching over and over and over agin System messages are showing repeated
Dec 25 14:42:02 ROLANDs-MacBook-Pro com.apple.xpc.launchd[1] (com.mysql.mysqld): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.

every one of two seconds. I think this is being started by com.oracle.oss.mysql.mysqld.
Using 'sudo launchctl remove' on both of these doesn't seem to work as after a restart they're both back, so there must be something else happening (Murphy Corollary: before you can do anything, there's something else you have to do first).
I have MySQL mysql-5.7.25-macos10.14-x86_64 loaded on the my Macbook Pro and in System Preferences it's being started on bootup.
How do I fix this issue ... I'd like to upgrade, but don't want to take this problem forward with the upgrade.
Thanks!
Roland
The script gets reloaded at boot because of RunAtLoad flag set to true in its plist.
Try unloading the script with following command, so it doesn't get picked up again.
sudo launchctl unload -w &lt;/path/to/com.mysql.mysql.plist&gt;

I don't have MySQL installed, so I can't tell exact location of the plist. Generally, it should be in /Library/LaunchDaemons/com.mysql.mysql.plist.
If not, look into following locations also and replace path in command:

~/Library/LaunchAgents
/Library/LaunchAgents
/System/Library/LaunchAgents
/System/Library/LaunchDaemons