Installing 21c and 19c RPM packages on the same host

yum -y localinstall oracle-database-ee-21c-1.0-1.ol8.x86_64.rpm

Updating Subscription Management repositories.

Unable to read consumer identity

This system is not registered with an entitlement server. You can use subscription-manager to register.

Repository ol8_baseos_latest is listed more than once in the configuration

Last metadata expiration check: 3:04:33 ago on Tue 17 Jan 2023 07:41:42 AM UTC. Error:

 Problem: package oracle-database-ee-19c-1.0-1.x86_64 conflicts with libclntsh.so provided by oracle-database-ee-21c-1.0-1.x86_64

• conflicting requests
• problem with installed package oracle-database-ee-19c-1.0-1.x86_64

(try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)