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as far i know (long time ago) these options are installed separatly. Check your install dialog if you find it. In case the packs are installed you find it (after started the java version of EE) on the left side of the tool.
Oracle 8i is a very old database version and it does not come with the kind of diag and tuning features that are available with the later version of database. Please install the latest version of the database (Oracle 11i) to get the features you are looking for.