Installing Oracle for SAP on existing non-SAP RDBMS

The title says it all -
I haven't been able to find any real docs supporting or not supporting the practice of using an existing Oracle 10.2 RDBMS to add an SAP DB. I know it's technically possible, but since the SAP Oracle installer is configured to build a new RDBMS for each SAP instance/DB installation, I'm wondering if it can be altered and piggy back on an existing one.
The reason is I have a customer who would like to do this so they can continue to use an existing DEV Oracle server without adding the stress of an indepedent set of oracle binaries running, and consuming resources.

> But aside from that - let's assume the release and patch levels from their own DBs are equal to the requirements from SAP. What other considerations/issues/supportabilty problems might be encountered?
If it's not a production system you could certainly go for it.
I think though, that it's MUCH LESS maintenance work using a second ORACLE_HOME than to try to fiddle with the huge amount of single/interim patches SAP requires. If you just check
Note 871096 - Oracle 10.2.0: Patches/patch collections for Oracle 10.2.0.2 (59 interim patches)
Note 1137346 - Oracle 10.2.0: Patches/patch collections for Oracle 10.2.0.4 (39 interim patches)
I can imagine you having a pretty hard time aligning that with the other non-SAP databases. On top may come incompatibilities with OPatch (SAP uses a "special OPatch") where you may need to switch between the official one and the "SAP-one" depending on which patch you install.
The only additional resources the new ORACLE_HOME uses is harddisk space (some GB) - which shouldn't be more expensive than the work you'll need to invest to keep the system and working for both.
Technically it can be done - certainly.
Markus

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Moderator message: please do more research before asking, show what you have done yourself when asking.
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Installing Oracle for SAP on existing non-SAP RDBMS

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