求解: ORA 03113：通讯通道的文件结束

 在Oracle10g访问 sql2005时,在PL中输入 一下一段代码:            
                         select rownum,
                         to_char(to_date('20100101','yyyyMMdd') + rownum- 1,
                                 'yyyyMMdd') as "fdate",
                         "Code",
                         "Name",
                    from (select A."Code", B."Name"
                            from (select max("Year") as "Year",
                                         "Code"
                                    from A@DBLINK
                                   where "Code" = '1'
                                   group by "Code") A left join 
                                B@DBLINKB
                           on A."Year" = B."Year" and A."Code" = B."Code")
                  connect by rownum <= to_date('20100907', 'yyyyMMdd') -
                             to_date('20100101', 'yyyyMMdd') + 1----------------------------------------------------------------------------------
                  报 ORA 03113：通讯通道的文件结束。
                  然后又报 ORA 03114 未连接到 Oracle。  请高手解决。