Clarifications needed for full text search

Question

Hi,
I need some clarification regarding full text search.
1) Is japanese part of the standard Oracle full text search?
2) if it is not, how to install the japanese lexer?
3) how oracle is sorting international characters. If a column contains both english, japanese and french, how will be the output?
Thanks
Muneer

Answer 1

Follwoing is the sql statement and the result i got
select language, description,lengthb(description) bytes, length(description) length, vsize(description) vsize from t2;
LANGUAGE      DESCRIPTION      BYTES      LENGTH      VSIZE
English      abcdefghij      10      10      10
English      zyxwvutsrq      10      10      10
French      désignéess      16      12      16
French      réconcilia      13      11      13
German      Einfuhrzöl      13      11      13
German      müßtämpfer      19      13      19
Greek      Î´Î·Î¼Î¿ÏƒÎ¹Î¿Î³ÏÎ±      40      20      40
Greek      Î±Ï€Î¿ÎºÎ»ÎµÎ¹ÏƒÏ„ι      42      20      42
Russian      Ð¿Ñ€ÐµÑÑ‚упник      42      20      42
Russian      Ð¿Ñ€Ð¸Ð²ÐµÐ´ÐµÐ½Ð¸Ñ      41      20      41
Japanese      å…¥é–“市の会社の銀行口      65      30      65
Japanese      ç¥žæˆ¸å¸‚ä¸å¤®åŒºã®æ±éŠåœ’      62      30      62
Korean      ì¶œë°œì ë¶€í„°ì¶œë°œì ë¶€í„°      64      30      64
Korean      ë³´ì¢Œê´€ì„출발점부터경      64      30      64
Hindi      à¤•à¤¤à¤œà¤¨à¤¤à¤®à¤¨à¤œà¤¤à¤¶à¥à¤°      73      36      73
Hindi      à¤¨à¥€à¤šà¥‡à¤¨à¥€à¤šà¥‡à¤¨à¥€à¤šà¥‡à¤¨à¥€à¤šà¥‡à¤¨à¥€à¤šà¥‡      130      60      130 I think it explains a lot. I am facing another problem in searching blob columns when it contains japanese or korean characters. I tried with multi lexer (adding japanese as sub lexer and making english as default lexer). But it is not searching the column. Do i have to set any other parameters (editing registry, changing enviornment setting etc). I used the following script to set the lexer.
begin
     ctx_ddl.create_preference('english_lexer','basic_lexer');
     ctx_ddl.set_attribute('english_lexer','index_themes','yes');
     ctx_ddl.set_attribute('english_lexer','theme_language','english');
     ctx_ddl.create_preference('german_lexer','basic_lexer');
     ctx_ddl.set_attribute('german_lexer','composite','german');
     ctx_ddl.set_attribute('german_lexer','mixed_case','yes');
     ctx_ddl.set_attribute('german_lexer','alternate_spelling','german');
     ctx_ddl.create_preference('japanese_lexer','japanese_vgram_lexer');
     ctx_ddl.create_preference('korean_lexer','KOREAN_MORPH_LEXER');
     ctx_ddl.set_attribute('korean_lexer','COMPOSITE','NGRAM');
     ctx_ddl.create_preference('global_lexer', 'multi_lexer');
     ctx_ddl.add_sub_lexer('global_lexer','default','english_lexer');
     ctx_ddl.add_sub_lexer('global_lexer','german','german_lexer','ger');
     ctx_ddl.add_sub_lexer('global_lexer','japanese','japanese_lexer','jpn');
     ctx_ddl.add_sub_lexer('global_lexer','korean','Korean_lexer');
end;Hope i presented enough details.