MariaDB compliant one from jcrespo – https://github.com/jynus/mysql-sys – this is something we could even merge into 10.1
Hope sys schema could come soon!
Hello,
My name is Kelli Grand, and I'm a product owner at cPanel. We are very interested in this change and would like to see this case get resolved. Can you please provide me with an update on the status of this case?
The impact of this problem is very high, from the number of tickets our customers create against it.
cPanel & WHM currently ship with MySQL 5.7 with conversion paths to Maria 10.2 and 10.3. As of January this year, there was an update to MySQL 5.7 that includes these tables. mysql_ugprade script does not currently support these tables, and it is producing these kinds of problems for end users:
- Inability to run mysqldump or mysqlbackup due to errors
- phpMyAdmin will not load
- Errors in the logs
We have a lot of customers on older versions of MySQL at this time, and are actively encouraging them to update. In the future when we no longer support MySQL 5.6, there will be even more customers experiencing this problem if they choose to migrate to MariaDB.
@Kelli I am not involved with MariaDB development, but I can help with a workaround. Colin linked above my patch for 10.1. We use it at Wikipedia for all our servers, as sys/performance_schema is key for us to do proper monitoring and profiling. I will soon review it to update it to the latest MySQL code base (at least for those features that it is feasible, and are not a hard dependency on MySQL new features. For migrations, old sys schema should be deleted and a MariaDB compatible one should be used instead, as MariaDB doesn't have things like UUID, certain metrics and there could be issues with the new data dictionary, among other differences. I of course will offer the patch to MariaDB developers if they want to bundle it by default.
I think it would be a great idea for mysql_upgrade (on MariaDB) to detect this issue and tried to patch or reload the sys schema from a compatible one.
Thank you @Jaime for the suggestion. This, or something like it could be a path we take as a last resort, if we don't see any action from MariaDB on this case.
FromDual has recently been doing some work porting the sys schema to MariaDB:
https://fromdual.com/mariadb-sys-schema.
karll It gives an error when I try on a MariaDB 10.5 installation. Funny how they say in that page "Please try out MariaDB sys Schema, find bugs, describe how to provoke the problem and report those bugs on GitHub", yet their GitHub repo isn't accepting any Issues...
I did only provide oli a cross version compatible solution 2 days ago https://github.com/FromDual/mariadb-sys/pull/2 
Alexey, please review the current bb-10.6-sysschema
There should be server option to switch SYS schema initialization on/off. Other test suites should run server without SYS schema and their results should not be affected. We do not want to enable SYS schema by default, do we? Users who need it will add corresponding option to their config files. Users who don't need it will not be dissatisfied by an unwanted entry in SHOW DATABASES.
Please tweak a little bit README.md file to reflect current state of things regarding the installation.
Otherwise looks good to me.
We do want to enable sys schema by default, just like others do. There is no way to disable it in MySQL 8.0
Let me quote https://dev.mysql.com/doc/refman/8.0/en/sys-schema.html
"
For new installations, the sys schema is installed by default during data directory initialization if you use mysqld with the --initialize or --initialize-insecure option. If this is not desired, you can drop the sys schema manually after initialization if it is unneeded."
The performance schema plugin is loaded by default with load option "FORCED", so it makes sense to have the sys schema installed by default, too