Oracle Text Reference Release 9.0.1 Part Number A90121-01 |
|
Indexing, 10 of 11
When you install Oracle Text, some indexing preferences are created. You can use these preferences in the parameter clause of CREATE INDEX or define your own.
The default index parameters are mapped to some of the system-defined preferences described in this section.
System-defined preferences are divided into the following categories:
This preference uses the DIRECT_DATASTORE type. You can use this preference to create indexes for text columns in which the text is stored directly in the column.
This preference uses the FILE_DATASTORE type.
This preference uses the URL_DATASTORE type.
This preference uses the NULL_FILTER type.
This preference uses the INSO_FILTER type.
The default lexer depends on the language used at install time. The following sections describe the default settings for CTXSYS.DEFAULT_LEXER for each language.
If your language is English, this preference uses the BASIC_LEXER with the index_themes attribute disabled.
If your language is Danish, this preference uses the BASIC_LEXER with the following option enabled:
If your language is Dutch, this preference uses the BASIC_LEXER with the following options enabled:
If your language is German, this preference uses the BASIC_LEXER with the following options enabled:
If your language is Finnish, Norwegian, or Swedish, this preference uses the BASIC_LEXER with the following option enabled:
If you language is Japanese, this preference uses the JAPANESE_VGRAM_LEXER.
If your language is Korean, this preference uses the KOREAN_MORPH_LEXER. All attributes for the KOREAN_MORPH_LEXER are enabled.
If your language is Simplified Chinese, this preference uses the CHINESE_VGRAM_LEXER.
For all other languages not listed in this section, this preference uses the BASIC_LEXER with no attributes set.
This preference uses the BASIC_LEXER.
This preference uses the NULL_SECTION_GROUP type.
This preference uses the HTML_SECTION_GROUP type.
This preference uses the AUTO_SECTION_GROUP type.
This preference uses the PATH_SECTION_GROUP type.
This stoplist preference defaults to the stoplist of your database language.
See Also:
For a complete list of the stop words in the supplied stoplists, see Appendix D, "Supplied Stoplists". |
This stoplist has no words.
This storage preference uses the BASIC_STORAGE type.
This preference uses the language stemmer for your database language. If your language is not listed in Table 2-1, this preference defaults to the NULL stemmer and the GENERIC fuzzy matching attribute.
|
Copyright © 1996-2001, Oracle Corporation. All Rights Reserved. |
|