Comments - odd mariadb-connector-c error on update
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maybe mariadb-connector-c is not maintained anymore? its been over three years since 10.3 was first released.
This is a conflict with CentOS/Redhat appstream modules. You need to disable them to use packages directly from MariaDB.
dnf module disable mysql mariadb
After running the above the normal MariaDB repo installs should work.