possible timeouts in sqlnet.ora in client oracle home:
? ? sqlnet.outbound_connect_time
? ? sqlnet.recv_timeout
? ? sqlnet.send_timeout
? ? tcp_connect_timeout
检查客户端目录中sqlnet.ora的超时设置，通常是这个引起的
possible timeout in client connect descriptor (hardcoded in client application or in client tnsnames.ora):
? ? connect_timeout
检查客户端应用或客户单tnsnames.ora中的超时参数