If you want to rebuild an index over SAP system then you can use the DB02 transaction for this operation….Let’s see the steps…

Go to DB02 –> Space –> Segments –> Detailed Analysis

Segment / Object : Input your INDEX name

F8 – EXECUTE

Click the REBUILD button

Select “Background” or “Dialog” mode , if index is not very big then you can choose Dialog mode

You can see the result below