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  • ORA-12521: TNS: 监听程序当前无法识别连接描述符中请求的实例(原)

    今天登录PL/SQL出现问题:

    ---------------------------
    sys@RAC1 as SYSDBA
    ---------------------------
    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监听配置:

    LISTENER_RAC1 =
    (DESCRIPTION_LIST =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip)(PORT = 1521)(IP = FIRST))
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.223)(PORT = 1521)(IP = FIRST))
    )
    )

    SID_LIST_LISTENER_RAC1 =
    (SID_LIST =
    (SID_DESC =
    (SID_NAME = PLSExtProc)
    (ORACLE_HOME = /opt/ora10g/product/10.2.0/db_1)
    (PROGRAM = extproc)
    )
    )

    没什么错误,

    后来发现在配置etc/hosts的时候有点问题:

    127.0.0.1 rac1 localhost.localdomain localhost
    ::1 localhost6.localdomain6 localhost6
    192.168.1.223 rac1
    192.168.1.224 rac2
    192.168.1.203 rac1-vip
    192.168.1.204 rac2-vip
    10.0.0.223 rac1-priv
    10.0.0.224 rac2-priv
    [root@rac1 etc]# ping rac1
    PING rac1 (127.0.0.1) 56(84) bytes of data.
    64 bytes from rac1 (127.0.0.1): icmp_seq=1 ttl=64 time=0.438 ms
    64 bytes from rac1 (127.0.0.1): icmp_seq=2 ttl=64 time=0.103 ms

    --- rac1 ping statistics ---
    2 packets transmitted, 2 received, 0% packet loss, time 1002ms
    rtt min/avg/max/mdev = 0.103/0.270/0.438/0.168 ms

    修改为:

    # that require network functionality will fail.
    127.0.0.1 localhost
    192.168.1.223 rac1
    192.168.1.224 rac2
    192.168.1.203 rac1-vip
    192.168.1.204 rac2-vip
    10.0.0.223 rac1-priv
    10.0.0.224 rac2-priv

    [root@rac1 etc]# ping rac1
    PING rac1 (192.168.1.223) 56(84) bytes of data.
    64 bytes from rac1 (192.168.1.223): icmp_seq=1 ttl=64 time=0.040 ms
    64 bytes from rac1 (192.168.1.223): icmp_seq=2 ttl=64 time=0.063 ms

    然后在把监听重启一下,等待片刻之后。

    PL/SQL可以登录了

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  • 原文地址:https://www.cnblogs.com/future2012lg/p/3730846.html
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