USER_DUMP_DEST：specifies the pathname for a directory where the server will write debugging trace files on behalf of a user process.BACKGROUND_DUMP_DEST：specifies the pathname (directory or disc) where debugging trace files for the background processes (LGWR, DBWn, and so on) are written during Oracle operations.CORE_DUMP_DEST：is primarily a UNIX parameter and may not be supported on your platform. It specifies the directory where Oracle dumps core files.上述可定时清理
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