Support and Patching
https://blogs.oracle.com/oda/post/oda-releases
We have a mix of x7 and X8.
If I understand correct with X7 being terminal at 19.27.
2 options.
Option 1 - keep 19.27 on all envs (x7/x8) and from that point on only patch DB out of band.
Option 2 - keep X7 on 19.27 on and 19.28 on all X8 envs and from that point on only patch the X8 meaning they will diverge from X7.
The problem I see is then we get behind on critical security/other patches as 19c DB will get ahead ……. and we cant get 19c DB ahead of the GI. So actually cant without upgrading both GI and DB out of band.