Is there any sense in partitioning only the data and leaving the indexes
global ?? What will i gain ??

Thanks
Raghu

Is there any sense in it? Sure. When you have a PK that is not your partition key, that's the only way to go.

You must be careful when you add/drop/modify/split a partition that has a global or regular index on it. Most often, you will need to rebuild the global/regular index because your partitioning operation has rendered the index unusable.