CHINESE_LEXER

Identifies tokens in traditional and simplified Chinese text for creating Oracle Text indexes.

The CHINESE_LEXER type offers the following benefits over the CHINESE_VGRAM_LEXER:

• generates a smaller index

• better query response time

• generates real word tokens resulting in better query precision

• supports stop words

Because the CHINESE_LEXER uses a different algorithm to generate tokens, indexing time is longer than with CHINESE_VGRAM_LEXER.

You can use this lexer if your database character is one of the Chinese or Unicode character sets supported by Oracle.

The CHINESE_LEXER has the following attribute:

Table 23 CHINESE_LEXER Attributes

Attribute	Attribute Value
mixed_case_ASCII7	Enable mixed-case (upper- and lower-case) searches of ASCII7 text (for example, cat and Cat). Allowable values are YES and NO (default).

You can modify the existing lexicon (dictionary) used by the Chinese lexer, or create your own Chinese lexicon, with the ctxlc command.

See Also: “Lexical Compiler (ctxlc)” in Oracle Text Utilities