ORA-12521错误的含义 ORA-12521 是一个 Oracle 数据库错误,通常表示客户端尝试连接到数据库服务器时发生了“TNS: 无监听器”错误。这意味着客户端无法找到 Oracle 的监听服务(Listener Service),该服务是 Oracle 数据库接收客户端连接请求的必要组件。 可能导致ORA-12521错误的原因 监听器未启动:Oracle 的监听服务(...
2、检查TNS名称解析: 确保您的TNS名称解析配置正确,您可以检查tnsnames.ora文件,确保其中的服务名和实例名正确无误,如果您使用的是LDAP服务器进行名称解析,确保LDAP服务器配置正确并且可以正常访问。 3、检查服务名和实例名: 确保您使用的服务名和实例名是正确的,服务名是用于标识数据库的全局唯一名称,而实例名是用于...
ORA-12521 Cannot connect to database. Instance string for service string is not registered with the listener at string. (CONNECTION_ID=string) Cause A listener process initially handles all connections to Oracle Database. The connection request received by the listener specified, in addition to ...
ORA-12521: TNS: 监听程序当前无法识别连接描述符中请求的实例 --- 但是TNSPING RAC1可以通的。 RAC1 = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST =192.168.1.203)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = racdb) (INSTANCE_NAME = racdb1) ) ) 查看rac1监...
Oracle driver raisingORA-12521error when JBoss attempts to create a connection to the Oracle database server Raw ORA-12521, TNS:listener does not currently know of instance requested in connect descriptor at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:673) ...
记一次rac TNS-12541,ORA-12520,ORA-12521 错误处理 阅读更多 客户一rac数据库发生故障,1号节点的vip漂移至2号节点,由于部分业务没有采用负载均衡模式连接,即直接连接1号节点vip,当1号节点的vip漂移至2号节点后,业务连接出现异常。 主要表现为tnsping出现TNS-12541,sqlplus连接出现ORA-12520...
Ora-12521, listener does not currently know of instance requested in connect descriptor 説明 Cannot get Toad to recognize or resolve the entries in my tnsnames.ora file. Trying to connect to an Oracle DB via VPN connection, and for one instance, can connect, but...
ORA-12521: TNS: 监听程序当前无法识别连接描述符中请求的实例 --- 但是TNSPING RAC1可以通的。 RAC1 = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST =192.168.1.203)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME ...