We see consistent failure of the test test_update_capabilities_install_performance() added in this commit https://github.com/moodle/moodle/commit/fe6a51265ae3f915b02d8f79dc3752884a323124 on MsSQL and Oracle.
If you look at the DML functions for these databases, the function insert_records() just calls insert_record() in a loop and the change makes no effect on these databases.

I suggest to at least skip this test on oracle and mssql

Maybe the test needs to be re-thought, it sounds very fragile and results depend on a lot of unknown factors - additional capabilities or roles added by non-standard plugins, capabilities added in the future to the mod_forum, etc.