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Listener Log file location in Oracle

I will explain Listener Log file location in Oracle in this post.

 

 

Listener Log file location in Oracle

Listener log file locations are very important for us. If you want to learn where listener log file location is, execute the lsnrctl status command as follows.

 

[oracle@msdbdbadm01 admin]$ lsnrctl status

LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 16-JUL-2021 14:54:57

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

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 12.1.0.2.0 - Production
Start Date 16-JUL-2021 14:54:41
Uptime 0 days 0 hr. 0 min. 15 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/12.1.0.2/grid/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/msdbdbadm01/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.3.16)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.9)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=msdbdbadm01.deveci.local)(PORT=5500))(Security=(my_wallet_directory=/u01/app/oracle/product/12.1.0.2/dbhome_1/admin/msdb/xdb_wallet))(Presentation=HTTP)(Session=RAW))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=msdbdbadm01.deveci.local)(PORT=5501))(Security=(my_wallet_directory=/u01/app/oracle/product/12.1.0.2/dbhome_1/admin/REPDB/xdb_wallet))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "FLEXDB" has 1 instance(s).
Instance "FLEXDB1", status READY, has 1 handler(s) for this service...
Service "FLEXDBXDB" has 1 instance(s).
Instance "FLEXDB1", status READY, has 1 handler(s) for this service...
Service "REPDB" has 1 instance(s).
Instance "REPDB1", status READY, has 1 handler(s) for this service...
Service "REPDBXDB" has 1 instance(s).
Instance "REPDB1", status READY, has 1 handler(s) for this service...
Service "msdb" has 1 instance(s).
Instance "msdb1", status READY, has 1 handler(s) for this service...
Service "msdbXDB" has 1 instance(s).
Instance "msdb1", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@msdbdbadm01 admin]$

 

 

 

 

 

 

 

I have marked the listener log file and parameter file locations above with RED and BLUE Color.

Listener Parameter File /u01/app/12.1.0.2/grid/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/msdbdbadm01/listener/alert/log.xml

 

When i go to /u01/app/oracle/diag/tnslsnr/msdbdbadm01/listener/alert directory, you can see the Listener log files ( Archived ) as follows.

 

-rw-r----- 1 oracle oinstall 11M Jun 11 10:14 log_409.xml
-rw-r----- 1 oracle oinstall 11M Jun 11 14:08 log_410.xml
-rw-r----- 1 oracle oinstall 11M Jun 12 20:22 log_411.xml
-rw-r----- 1 oracle oinstall 5.0M Jul 16 15:07 log.xml
[oracle@msdbdbadm01 alert]$ 
[oracle@msdbdbadm01 alert]$ pwd
/u01/app/oracle/diag/tnslsnr/msdbdbadm01/listener/alert
[oracle@msdbdbadm01 alert]$

 

 

 

If you want to review the log file, you can display it with tail command as follows.

[oracle@msdbdbadm01 alert]$ tail -10f log.xml 
host_addr='192.168.3.16'>
<txt>16-JUL-2021 15:14:01 * (CONNECT_DATA=(SERVICE_NAME=msdb)(CID=(PROGRAM=C:\Windows\SysWOW64\inetsrv\w3wp.exe)(HOST=WEBMIS)(USER=webmis))(SERVER=dedicated)(INSTANCE_NAME=msdb1)) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.8.60)(PORT=60861)) * establish * msdb * 0
</txt>
</msg>
<msg time='2021-07-16T15:14:02.106+03:00' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='msdbdbadm01.deveci.local'
host_addr='192.168.3.16'>
<txt>16-JUL-2021 15:14:02 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))(SERVICE_NAME=msdb)(CID=(PROGRAM=)(HOST=__jdbc__)(USER=))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.8.54)(PORT=50398)) * establish * msdb * 0
</txt>
</msg>
^C
[oracle@msdbdbadm01 alert]$ 
[oracle@msdbdbadm01 alert]$ 
[oracle@msdbdbadm01 alert]$

 

 

Listener Parameter File Location

Listener parameter files is located under $ORACLE_HOME/network/admin directory as follows.

If you are using the Oracle RAC, Cluster manages the Listener, and you can also use the static listener.

 

[oracle@msdbdbadm01 admin]$ cd $ORACLE_HOME/network/admin
[oracle@msdbdbadm01 admin]$ 
[oracle@msdbdbadm01 admin]$ pwd
/u01/app/12.1.0.2/grid/network/admin
[oracle@msdbdbadm01 admin]$ 
[oracle@msdbdbadm01 admin]$ cat listener.ora
MGMTLSNR=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=MGMTLSNR)))) # line added by Agent
# listener.ora Network Configuration File: /u01/app/12.1.0.2/grid/network/admin/listener.ora
# Generated by Oracle configuration tools.

ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN3 = ON

ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN2 = ON

ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1 = ON

VALID_NODE_CHECKING_REGISTRATION_LISTENER_SCAN3=OFF # line added by Agent

VALID_NODE_CHECKING_REGISTRATION_LISTENER_SCAN2=OFF # line added by Agent

VALID_NODE_CHECKING_REGISTRATION_LISTENER_SCAN1=OFF # line added by Agent

VALID_NODE_CHECKING_REGISTRATION_LISTENER = SUBNET

LISTENER =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = LISTENER))
)
)

ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER = ON

LISTENER_SCAN3 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = LISTENER_SCAN3))
)
)

LISTENER_SCAN2 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = LISTENER_SCAN2))
)
)

LISTENER_SCAN1 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = LISTENER_SCAN1))
)
)

ENABLE_GLOBAL_DYNAMIC_ENDPOINT_MGMTLSNR=ON # line added by Agent
VALID_NODE_CHECKING_REGISTRATION_MGMTLSNR=SUBNET # line added by Agent
[oracle@msdbdbadm01 admin]$

 

 

You can read the following post to learn more details about Oracle Listener.

How to set LOCAL_LISTENER using Alter System Set Command in Oracle

 

 

 

Do you want to learn Oracle Database for Beginners, then read the following articles.

Oracle Tutorial | Oracle Database Tutorials for Beginners ( Junior Oracle DBA )

 

 

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