dispatchers

主要是看下SERVICE里面XDB前面应该写什么：

If XDB dispatchers is not already set, add the following line to the init.ora:

Non-RAC:
dispatchers="(PROTOCOL=TCP)(SERVICE=<sid>XDB)"

Or from the Sql*Plus prompt:

SQL> alter system set dispatchers="(PROTOCOL=TCP)(SERVICE=XDB)" scope=both sid='<sid>';

RAC:
instanceid1.dispatchers="(PROTOCOL=TCP) (SERVICE=<instanceid1>XDB)"
instanceid2.dispatchers="(PROTOCOL=TCP) (SERVICE=<instanceid2>XDB)"