The Oracle Corporation has hired one of its biggest fans on Wall Street as a top executive to work side-by-side with its chief executive, Lawrence J. Ellison. Charles E. Phillips, a leading analyst at Morgan Stanley, will become executive vice president of Oracle. The move, which was announced Thursday, comes less than a month after Wall Street's top brokerage firms agreed to pay a total of $1.4 billion to settle allegations about conflicts of interest between analysts and the companies they follow. As an analyst, Mr. Phillips was host to Oracle executives for dinner at his Manhattan home. He has followed makers of so-called enterprise software, used by large businesses and organizations, since 1986.