Oracle's stock has been on fire -- but is it a sustainable surge? If not, this longtime rival could soon eclipse the database giant's market value.Database software titan Oracle (ORCL 4.46%) is soaring in 2025. As I write this on Sept. 18, the stock has gained 97% in six months. The company is knocking on the door of the trillion-dollar club, sporting a market cap of $855 billion. The company is landing billion-dollar cloud computing deals thanks to the ongoing artificial intelligence (AI) boom.Oracle's sur ...