Hi Sahil,
Direct upgrade from Oracle 9 to Oracle 11g is not supported only if database version is Oracle 9.2.0.8
.If in your case database version is below this , you may first upgrade the database to Oracle 9.2.0.8 and then perform upgrade to Oracle 11g.
Post DB upgrade you may proceed with SAP upgrade as designated.
Refer Oracle upgrade guide for more details.
Hope this helps.
Regards,
Deepak Kori