Creating Preferences

To create a datastore, lexer, filter, classifier, wordlist, or storage preference, use the CTX_DDL.CREATE_PREFERENCE procedure and specify one of the types described in this chapter. For some types, you can also set attributes with the CTX_DDL.SET_ATTRIBUTE procedure.

An indexing type names a class of indexing objects that you can use to create an index preference. A type, therefore, is an abstract ID, while a preference is an entity that corresponds to a type. Many system-defined preferences have the same name as types (for example, BASIC_LEXER), but exact correspondence is not guaranteed. Be careful in assuming the existence or nature of either indexing types or system preferences.

You specify indexing preferences with the CREATE INDEX and ALTER INDEX statements. Indexing preferences determine how your index is created. For example, lexer preferences indicate the language of the text to be indexed. You can create and specify your own user-defined preferences, or you can use system-defined preferences.

To create a stoplist, use the CTX_DDL.CREATE_STOPLIST procedure. Add stopwords to a stoplist with CTX_DDL.ADD_STOPWORD.

To create section groups, use CTX_DDL.CREATE_SECTION_GROUP and specify a section group type. Add sections to section groups with the CTX_DDL.ADD_ZONE_SECTION or CTX_DDL.ADD_FIELD_SECTION procedures.