1、网络原因

2、账户权限问题

账户是否赋予以下的权限:

grant connect, resource to ADM_BI;

grant read, write on directory BACKUP to ADM_BI;

grant select on DBA_2PC_PENDING to ADM_BI;

grant select on DBA_PENDING_TRANSACTIONS to ADM_BI;

grant execute on DBMS_XA to ADM_BI;

grant select on PENDING_TRANS$ to ADM_BI;