ORA-12520: TNS: 监听程序无法找到需要的服务器类型的可用句柄。
解决方法
在oracle安装目录下搜索tnsnames.ora(如:G:\oracle\product\10.2.0\db_2\NETWORK\ADMIN)
将其中的共享模式:SHARED
GS = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = GCOQ3XIPLGQ4Y22)(PORT = 1521)) ) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = gs) ) )