Last few lines in error log:
Package(s) mariadb available, but not installed.
Package(s) mariadb-server available, but not installed.
No packages marked for update
Loaded plugins: package_upload, product-id, search-disabled-repos, subscription-
: manager
Package mariadb-server is obsoleted by mysql-community-server, trying to install mysql-community-server-5.7.26-1.el7.x86_64 instead
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-server.x86_64 0:5.7.26-1.el7 will be installed
--> Processing Conflict: 1:mariadb101u-config-10.1.35-1.ius.el7.x86_64 conflicts mysql-community-server
--> Finished Dependency Resolution
Error: mariadb101u-config conflicts with mysql-community-server-5.7.26-1.el7.x86_64
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest