Oracle Linux 서버 7.6에 Oracle 19c 데이터베이스 사전 설치를 설치할 때 오류가 발생했습니다.

oracle linux 7.6에 oracle 19c를 설치하려고 합니다. oracle 19c 사전 설치를 설치해야 합니다. 새로 설치한 것이지만 왜 이러한 오류가 발생하는지 이해할 수 없습니다.

    yum -y localinstall http://yum1.stanford.edu/mrepo/ol8-x86 64/RPMS.appstream/oracle-database-preinstall-19c-1.0-2.el8.x86 64.rpm
Loaded plugins: langpacks, ulninfo
Repository ol7_latest is listed more than once in the configuration
Repository ol7_u0_base is listed more than once in the configuration
Repository ol7_u1_base is listed more than once in the configuration
Repository ol7_u2_base is listed more than once in the configuration
Repository ol7_u3_base is listed more than once in the configuration
Repository ol7_u4_base is listed more than once in the configuration
Repository ol7_u5_base is listed more than once in the configuration
Repository ol7_u6_base is listed more than once in the configuration
Repository ol7_security_validation is listed more than once in the configuration
Repository ol7_optional_latest is listed more than once in the configuration
Repository ol7_addons is listed more than once in the configuration
Repository ol7_MODRHCK is listed more than once in the configuration
Repository ol7_latest_archive is listed more than once in the configuration
Repository ol7_optional_archive is listed more than once in the configuration
Repository ol7_UEKR5 is listed more than once in the configuration
Repository ol7_UEKR4 is listed more than once in the configuration
Repository ol7_UEKR3 is listed more than once in the configuration
Repository ol7_UEKR3_OFED20 is listed more than once in the configuration
Repository ol7_UEKR5_RDMA is listed more than once in the configuration
Repository ol7_UEKR4_OFED is listed more than once in the configuration
Repository ol7_UEKR4_archive is listed more than once in the configuration
Repository ol7_UEKR5_archive is listed more than once in the configuration
Repository ol7_kvm_utils is listed more than once in the configuration
Skipping: http://yum1.stanford.edu/mrepo/ol8-x86, filename does not end in .rpm.
Skipping: 64/RPMS.appstream/oracle-database-preinstall-19c-1.0-2.el8.x86, filename does not end in .rpm.
Cannot open: 64.rpm. Skipping.
Nothing to do