ORA-01034: ORACLE not available
ORA-27102: out of memory
You would need to ask in the database forum as those errors aren't OBIEE errors but database errors.
There is a problem with your database, therefore OBIEE can't do the job, but the errors are database errors, so look there.
Check the database alert log (or, have your DBA/team check). There should be some additional details there.
I have almost the same issue as this.
v12.4 install... Failed at the BIStartup section after everything else passed fine.
What did you end up doing? Is it safe to install the windows service manually and move on or are there other things the config wizard does after that step that I should be wary of?
Trying to work out if I need to start again.