SAN JOSE — Just days after a major loss in its epic battle with Google Inc. over software for mobile phones, Oracle faced off with another tech giant — Hewlett-Packard. But this time Oracle was at the defense table.

HP’s counsel promised Santa Clara County Superior Court Judge James Kleinberg on Monday that evidence would show that the cozy corporate relationship the two tech titans enjoyed for decades soured when Oracle violated a deal they had by announcing it would stop supporting its database software for HP’s Itanium-powered Integrity servers.