lsnrctl如何检查监听器状态

lsnrctl 是 Oracle 数据库的一个命令行工具，用于管理和监控 Oracle 数据库的监听器。要使用 lsnrctl 检查监听器的状态，请按照以下步骤操作：

1. 打开命令提示符或终端。

2. 输入 lsnrctl status 命令，然后按 Enter 键。这将显示监听器的当前状态，包括监听器名称、版本、启动时间等信息。

   示例输出：

   LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 01-JAN-2021 12:34:56
   
   Copyright (c) 1991, 2019, Oracle.  All rights reserved.
   
   Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
   STATUS of the LISTENER
   ------------------------
   Alias                     LISTENER
   Version                   TNSLSNR for Linux: Version 19.0.0.0.0 - Production
   Start Date                01-JAN-2021 12:34:56
   Uptime                    0 days 0 hr. 30 min. 12 sec
   Trace Level               off
   Security                  ON: Local OS Authentication
   SNMP                      OFF
   Listener Parameter File   /u01/app/oracle/product/19.0.0/dbhome_1/network/admin/listener.ora
   Listener Log File         /u01/app/oracle/diag/tnslsnr/hostname/listener/alert/log.xml
   Listening Endpoints Summary...
     (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=hostname)(PORT=1521)))
   Services Summary...
     Service "CLRExtProc" has 1 instance(s).
       Instance "clrextproc", status READY, has 1 handler(s) for this service...
     Service "xe" has 1 instance(s).
       Instance "xe", status READY, has 1 handler(s) for this service...
   

3. 若要查看特定监听器的详细信息，请使用 lsnrctl status <listener_name> 命令，其中 <listener_name> 是要检查的监听器名称。如果不指定监听器名称，lsnrctl 将显示默认监听器的状态。

   示例输出：

   LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 01-JAN-2021 12:34:56
   
   Copyright (c) 1991, 2019, Oracle.  All rights reserved.
   
   Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
   STATUS of the LISTENER
   ------------------------
   Alias                     LISTENER
   Version                   TNSLSNR for Linux: Version 19.0.0.0.0 - Production
   Start Date                01-JAN-2021 12:34:56
   Uptime                    0 days 0 hr. 30 min. 12 sec
   Trace Level               off
   Security                  ON: Local OS Authentication
   SNMP                      OFF
   Listener Parameter File   /u01/app/oracle/product/19.0.0/dbhome_1/network/admin/listener.ora
   Listener Log File         /u01/app/oracle/diag/tnslsnr/hostname/listener/alert/log.xml
   Listening Endpoints Summary...
     (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=hostname)(PORT=1521)))
   Services Summary...
     Service "CLRExtProc" has 1 instance(s).
       Instance "clrextproc", status READY, has 1 handler(s) for this service...
     Service "xe" has 1 instance(s).
       Instance "xe", status READY, has 1 handler(s) for this service...
   

通过这些步骤，您可以使用 lsnrctl 检查 Oracle 数据库监听器的状态。如果监听器未启动或存在问题，您可以根据输出的信息进行故障排除。

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