Limitations for Adding Knowledge Bases

Here are the limitations for adding knowledge bases:

• Oracle supplies knowledge bases only in English and French. You must provide your own thesaurus for any other language.

• You can add knowledge bases only for languages with single-byte character sets. You cannot create a knowledge base for languages that can be expressed only in multibyte character sets. If the database is a multibyte universal character set, such as UTF-8, you must still set the NLS_LANG parameter to a compatible single-byte character set when you compile the thesaurus.

• Adding a knowledge base works best for whitespace-delimited languages.

• Only one knowledge base is allowed for each NLS_LANG language.

• Obtaining hierarchical query feedback information (for example, broader terms, narrower terms, and related terms) does not work in languages other than English and French. In other languages, the knowledge bases are derived entirely from your thesauruses. In such cases, Oracle recommends that you obtain hierarchical information directly from your thesauruses.

  See Also: Oracle Text Reference for more information about theme indexing, ABOUT queries, using the CTX_DOC package, and the supplied English knowledge base