diff --git a/api/core/rag/datasource/vdb/oracle/oraclevector.py b/api/core/rag/datasource/vdb/oracle/oraclevector.py
index 8262c219b4..e5ca4492c6 100644
--- a/api/core/rag/datasource/vdb/oracle/oraclevector.py
+++ b/api/core/rag/datasource/vdb/oracle/oraclevector.py
@@ -61,7 +61,7 @@ CREATE TABLE IF NOT EXISTS {table_name} (
 SQL_CREATE_INDEX = """
 CREATE INDEX IF NOT EXISTS idx_docs_{table_name} ON {table_name}(text) 
 INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS 
-('FILTER CTXSYS.NULL_FILTER SECTION GROUP CTXSYS.HTML_SECTION_GROUP LEXER multilingual_lexer')
+('FILTER CTXSYS.NULL_FILTER SECTION GROUP CTXSYS.HTML_SECTION_GROUP LEXER world_lexer')
 """
 
 
diff --git a/docker/startupscripts/init_user.script b/docker/startupscripts/init_user.script
index 55e8510d2f..0c5bff1ef6 100755
--- a/docker/startupscripts/init_user.script
+++ b/docker/startupscripts/init_user.script
@@ -5,6 +5,6 @@ create user dify identified by dify DEFAULT TABLESPACE users quota unlimited on
 grant DB_DEVELOPER_ROLE to dify;
 
 BEGIN
-CTX_DDL.CREATE_PREFERENCE('dify.multilingual_lexer','CHINESE_VGRAM_LEXER');
+CTX_DDL.CREATE_PREFERENCE('dify.world_lexer','WORLD_LEXER');
 END;
 /