Changelog for oracle-database-server-12cR2-preinstall-1.0-4.el7.x86_64.rpm :

* Thu Aug 02 2018 Vasundhara V [1.0-4.el7]- Remove comments from previous preinstall rpm [Orabug 28058876] - Ensure yum erase restores the values of recently installed preinstall rpm [Orabug 28058890]
* Fri Jun 09 2017 Vasundhara V [1.0-3.el7]- Added new user/groups [Orabug 25045020] - Fix upgrade issues [Orabug 26244431] - Added oraclelinux-release to dependencies [Orabug 26244588]
* Tue Oct 18 2016 Vasundhara V [1.0-2.el7]- Fixed grub2 entries [Orabug 24828130] - Fixed co-exist issues with sysconfig/network [Orabug 24903029] - Fixed upgrade issues [Orabug 24903070]
* Wed Aug 17 2016 Vasundhara V [1.0-1.el7]- Initial version with new name