Batuwa. 1. Answer to your first question is yes,it can be done and the pl/sql code has to be recompiled for UNIX,LINUX .Only then the OS kernel of UNIX or Linux recognises it. 2. SQL plus is nothing but a front end application for accessing your data from the database. So no matter what your O/S is, it works fine. And PL/SQL code development is done from Oracle's Developer's Suite. Go to www.OTN.oracle.com and register a free account then start learning. One more suggestion to you is that : You will need 100 years to learn Oracle if you want Sajha.com to teach you. So better use your time somewhere else.