We are trying to install SAP using SWPM on an existing Oracle database. We don't want SAP installer to create the database, but use an existing Oracle database instead. The custom parameters in the installer prompt for DBSID, but there is no way to input ORACLE_HOME. Our approach is to install oracle binaries as 'oracle' user on a separate ORACLE_HOME (for example /opt/oracle/product/db/12102) and then create a database and have SAP installer to point to that database to create tablespaces, schema etc., and then load the objects. It looks like SAP installer assumes that the ORACLE_HOME is /oracle/<SID>/121 and throws an error that it couldn't talk to the database.
Has anyone used this approach of installing SAP on an existing Oracle database? If so, are there any specific environment related parameters that need to be set to make this work?
Appreciate your help on this.