ORA-20000：ORU-10027：buffer overflow,limit of 2000 bytes.

 ORA-20000：ORU-10027：buffer overflow,limit of 2000 bytes. 

这是因为在过程中用到了dbms_output.put_line()在服务器端输出信息，而serveroutput   的size默认定义为10000bytes。

修改一下size应该就可以了

set serveroutput on 30000

ORA-20000 string

Cause:The stored procedure RAISE_APPLICATION_ERROR was called which causes this error to be generated.

Action:Correct the problem as described in the error message or contact the application administrator or database administrator for more information.

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写存储过程时遇到一个问题，执行dbms_output.putline(变量名)的时候，报错
ORA-20000：ORU-10027：buffer overflow,limit of 2000 bytes.

$ oerr ora 20000
20000, 00000, "%s"
// *Cause:  The stored procedure 'raise_application_error'
//          was called which causes this error to be generated.
// *Action: Correct the problem as described in the error message or contact
//          the application administrator or DBA for more information.

应该是变量大小超过了dbms_output.putline的最大值。

解决办法：
SQL>set   serveroutput   on   size   1000000

##2014-07-18添加
解决办法2：
在begin后面加上DBMS_OUTPUT.ENABLE(buffer_size => null) ，表示输出buffer不受限制。

如下面的语句是为了获取创建索引语句
set serveroutput on
declare
  v_sql    varchar2(1000);
  v_result varchar2(2000);
begin
  for cur_sql in (select 'select dbms_metadata.get_ddl(''INDEX'',''' ||
                         T.INDEX_NAME || ''',''XXXX'') FROM DUAL' as f_sql
                    from v$object_usage t
                   where t.monitoring = 'YES'
                     AND T.USED = 'NO') loop
    begin
      DBMS_OUTPUT.ENABLE(buffer_size => null); --表示输出buffer不受限制
      execute immediate cur_sql.f_sql
        into v_result;
      --DBMS_OUTPUT.PUT_LINE(cur_sql.f_sql);
      DBMS_OUTPUT.PUT_LINE(v_result);
    end;
  end loop;
end;
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