奇怪的ORA-06502：PL/SQL：數值或數值錯誤

Question

我正在循環訪問數據庫中的表定義並提取DDL以便能夠爲軟件測試目的創建表「重複數據」的表副本集。我已經得到了下面的代碼，它提取DDL只是罰款一個表拋出一個ORA-06502錯誤。事情是，我已經定義了DDL作爲CLOB返回的變量，該變量應該足夠大。這裏的代碼：

create or replace 
procedure gettabledescription as 
    current_date_time varchar2(32); 
    sql_statement varchar2(200); 
    ddl_return clob; 
    new_ddl clob; 
BEGIN 
    DBMS_OUTPUT.ENABLE; 
    current_date_time:= to_char(sysdate,'MM/DD/YYYY - HH24:MI:SS'); 
    dbms_output.put_line(current_date_time); 
    for cursor_rec in (select * from user_objects where object_type='TABLE' and object_name not like 'TM%' and object_name not like 'TZ_%' and object_name not like 'EXT_%' and object_name not like 'RPT_%' and object_name not like 'ETL_%') loop 
    sql_statement := 'select dbms_metadata.get_ddl(''TABLE'',' || '''' || cursor_rec.object_name || '''' || ') from dual'; 
    execute immediate sql_statement into ddl_return; 
    **error thrown here** new_ddl := replace(ddl_return,TO_CHAR(cursor_rec.object_name),'QA_' || TO_CHAR(cursor_rec.object_name)); 
    dbms_output.put_line(new_ddl); 
    end loop; 
END GETTABLEDESCRIPTION; 

我不明白爲什麼我得到那個錯誤。

Answer 1

在Oracle 10gR2上，當我調用帶有長度超過8191字節的varchar2或clob的DBMS_OUTPUT.PUT_LINE時，我收到一個ORA-06502錯誤。解決方法是循環clob，拔出線並每次調用put_line一次。