ORACLE DATABASE UPGRADE FROM 11G TO 12C FOR SAP SYSTEMSThis book created after 30 successful production database upgrade projects. And that all databases belong to SAP ECC and BW systems. As you know after MAY/31/2017 date sap will stop normal support for oracle 11g version and extended support time will start for oracle 11g. And SAP will provide extended support if you have agreement with sap until DEC/31/2020. Also you can check this SNOTE 2098258. For that reasons and for the best performance of your sap systems and oracle databases you should upgrade your database to Oracle 12c. In 2016 year, I upgraded 30 database servers and I faced many issues and fixed both of them. With this book I will share to all my experiences.