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Santa Barbara-based Tenet Healthcare Corp. said fiscal fourth-quarter profit before charges rose 21%, beating estimates, although costs related to the acquisition of OrNda Healthcare resulted in a bottom-line loss. The second-largest U.S. hospital chain said profit from continuing operations climbed to $127.6 million, or 41 cents a share, from $104.9 million, or 35 cents, a year ago. . . . Menlo Park-based Informix Corp. replaced Chairman Phillip White with Robert Finocchio Jr., the company’s new chief executive, in the latest management shake-up at the struggling database-software maker.