We do support Oracle 19c with all components. I have provided the Support Matrix for each.
vApp Matrix (which refers back to each component)
We continue to support Oracle 19c in 14.4 for all components. You can select the version drop down at the top and select 14.4 to see the confirmed support matrix for each component for 14.4. Here is the IM 14.4 Support Matrix which confirms Oracle 19c
1. We would like to know the vApp identity Suite 14.2 will it support or not?
Yes, we support Oracle 19c. See the above URLs with the confirms Support Matrix links for each component.
2. What is the recommendations
Oracle 19c is supported. You can use it for vApp components
3. Also we are working on upgrading the Identity suite to 14.4 target to upgrade end of November
Oracle 19c is supported on 14.4 for all components.