參考文章
http://space.itpub.net/13379967/viewspace-474767
oracle全文檢索（oracle text）
http://winie.javaeye.com/blog/663835
http://hi.baidu.com/lzycsd/blog/item/f083473835da4f2897ddd878.html
1.
create table WT_LIGHTING_S_INDEX
(
SOURCE_ID NUMBER,
ID NUMBER,
DESC1 VARCHAR2(4000),
CREATE_DATE DATE
)
2.ctx_ddl.create_preference ('lighting_lexer', 'chinese_lexer');
3.CREATE INDEX wt_lighting_index ON WT_LIGHTING_S_INDEX(DESC1)
indextype is ctxsys.context parameters('lexer lighting_lexer');
alter user lighting quota unlimited on users;
GRANT EXECUTE ON CTXSYS.CTX_DDL