Question

我在linux机器上安装了Oracle Database 12.1.0.2。这是第一次一切正常，但当我重新启动我的机器，然后我无法连接到数据库，它会抛出此错误

ORA-12514：TNS：监听器当前不知道连接描述符
中请求的服务

我的listerner.ora文件如下：

LISTERNER=
(DESCRIPTON_LIST=
  (DESCRIPTION=
   (ADDRESS = (PROTOCOL = TCP)(HOST=oracle.localdomain)(PORT=1521))
   (ADDRESS= (PROTOCOL = IPC)(KEY=EXTPROC1521))
  )
 )
 SID_LIST_LISTENER=
  (SID_LIST=
      (SID_DESC=
           (SID_NAME=orcl)
           (ORACLE_HOME=/u01/app/oracle/product/12.1.0.2/db_1)
           (PROGRAM = /u01/app/oracle/product/12.1.0.2/db_1/bin/dg4odbc)
       )
   )
  DEFAULT_SERVICE_LISTERNER=(orcl.localdomain)

我的tnsnames.ora文件如下：

orcl=
 (DESCRIPTION=
    (ADDRESS=(PROTOCOL = TCP)(HOST=oracle.localdomain)(PORT=1521))
    (CONNECT_DATA=
      (SERVER = DEDICATED)
      (SERVICE_NAME=orcl.localdomain)
     )
   )

请帮助我坚持这个问题超过2周。

tnsping orcl命令提供以下输出：

TNS Ping Utility ffor Linux: Version 12.1.0.2.0 - Production on 01-DEC-2015       15:21:46
Copyright (c) 1997, 2014, Oracle. All Rights reserved.
Used parameter files:
/u01/app/oracle/product/12.1.0.2/db_1/network/admin/sqlnet.ora

Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION=
    (ADDRESS=(PROTOCOL = TCP)(HOST=oracle.localdomain)(PORT=1521))
    (CONNECT_DATA=
      (SERVER = DEDICATED)
      (SERVICE_NAME=orcl.localdomain)
     )
   )
OK (0msec)

lsnrctl status命令提供此输出：

[oracle@oracle ~]$ lsnrctl status

 LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 01-DEC-2015 15:38:50

 Copyright (c) 1991, 2014, Oracle.  All rights reserved.

 Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle.localdomain)    (PORT=1521)))
 STATUS of the LISTENER
 ------------------------
 Alias                     LISTENER
 Version                  TNSLSNR for Linux: Version 12.1.0.2.0 -Production
Start Date                01-DEC-2015 14:08:29
Uptime                    0 days 1 hr. 30 min. 20 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Default Service           orcl.localdomain
Listener Parameter File   
/u01/app/oracle/product/12.1.0.2 /db_1/network/admin/listener.ora
Listener Log File         
/u01/app/oracle/diag/tnslsnr/oracle/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oracle.localdomain)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary...
Service "orcl" has 1 instance(s).
Instance "orcl", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

Answer 1

根据我们在评论中的对话，您现在可以在本地连接。您只需要启动数据库。让我详细解释一下：

要连接到数据库本地，您不需要侦听器。您只需要接收远程连接。

要在本地连接，您只需要 ORACLE_HOME 和 ORACLE_SID 环境变量的组合。

export ORACLE_HOME=path of ORACLE_HOME
export PATH=$PATH:$ORACLE_HOME/bin
export ORACLE_SID=orcl
sqlplus / as sysdba

现在，您已连接到空闲实例。您需要启动数据库：

startup;

另一方面，请记住， tnsping 非常原始。它只验证主机和端口，而不是其他任何内容。它不验证 service_name 或 SID 。它不确定数据库实例和数据库服务可用性。请参阅Billy的回复here。

无法连接到数据库12c

1 个答案: