We have an application running locally where we're experiencing the following error:
ORA-12514: TNS:listener does not currently know of service requested
in connect descriptor
I've tested the connection using TNSPing which resolved correctly and
I tried SQLPlus to try connecting, which failed with the same error as above. I used this syntax for SQLPlus:
sqlplus username/password#addressname[or host name]
We have verified that:
the TNS Listener on the server is running.
Oracle itself on the server is running.
We don't know of any changes that were made to this environment.
Anything else we can test?
I had this issue and the fix was to make sure in tnsnames.ora the SERVICE_NAME is a valid service name in your database. To find out valid service names, you can use the following query in oracle:
select value from v$parameter where name='service_names'
Once I updated tnsnames.ora to:
TEST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = *<validhost>*)(PORT = *<validport>*))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = *<servicenamefromDB>*)
)
)
then I ran:
sqlplus user#TEST
Success!
The listener is basically telling you that whatever service_name you are using isn't a valid service according to the DB.
(*I was running sqlplus from Win7 client workstation to remote DB and blame the DBAs ;) *)
I know this is an old question, but still unanswered. It took me a day of research, but I found the simplest solution, at least in my case (Oracle 11.2 on Windows 2008 R2) and wanted to share.
The error, if looked at directly, indicates that the listener does not recognize the service name. But where does it keep service names? In %ORACLE_HOME%\NETWORK\ADMIN\listener.ora
The "SID_LIST" is just that, a list of SIDs and service names paired up in a format you can copy or lookup.
I added the problem Service Name, then in Windows "Services" control panel, I did a "Restart" on the Oracle listener service. Now all is well.
For example, your listener.ora file might initially look like:
# listener.ora Network Configuration File: C:\app\oracle_user\product\12.1.0\dbhome_1\network\admin\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\app\oracle_user\product\12.1.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:C:\app\oracle_user\product\12.1.0\dbhome_1\bin\oraclr12.dll")
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)
... And to make it recognize a service name of orcl, you might change it to:
# listener.ora Network Configuration File: C:\app\oracle_user\product\12.1.0\dbhome_1\network\admin\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\app\oracle_user\product\12.1.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:C:\app\oracle_user\product\12.1.0\dbhome_1\bin\oraclr12.dll")
)
(SID_DESC =
(GLOBAL_DBNAME = orcl)
(ORACLE_HOME = C:\app\oracle_user\product\12.1.0\dbhome_1)
(SID_NAME = orcl)
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)
In my circumstances the error was due to the fact the listener did not have the db's service registered. I solved this by registering the services. Example:
My descriptor in tnsnames.ora:
LOCALDB =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = LOCALDB)
)
)
So, I proceed to register the service in the listener.ora manually:
SID_LIST_LISTENER =
(SID_DESC =
(GLOBAL_DBNAME = LOCALDB)
(ORACLE_HOME = C:\Oracle\product\11.2.0\dbhome_1)
(SID_NAME = LOCALDB)
)
Finally, restart the listener by command:
> lsnrctl stop
> lsnrctl start
Done!
I had this issue at Windows server 2008 R2 and Oracle 11g
go to Net Manager > Listener > select database services form the combox > "Global Database Name" must be same as "SID" and "Oracle Home Directory" must be correct.
If you don't have any entry for database services, create one and set correct global database , sid and oracle home.
This really should be a comment to [Brad Rippe][1]'s answer, but alas, not enough rep. That answer got me 90% of the way there. In my case, the installation and configuration of the databases put entries in the tnsnames.ora file for the databases I was running. First, I was able to connect to the database by setting the environment variables (Windows):
set ORACLE_SID=mydatabase
set ORACLE_HOME=C:\Oracle\product\11.2.0\dbhome_1
and then connecting using
sqlplus / as sysdba
Next, running the command from Brad Rippe's answer:
select value from v$parameter where name='service_names';
showed that the names didn't match exactly. The entries as created using Oracle's Database Configuration Assistant were originally:
MYDATABASE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = mylaptop.mydomain.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = mydatabase.mydomain.com)
)
)
The service name from the query was just mydatabase rather than mydatabase.mydomain.com. I edited the tnsnames.ora file to just the base name without the domain portion so they looked like this:
MYDATABASE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = mylaptop.mydomain.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = mydatabase)
)
)
I restarted the TNS Listener service (I often use lsnrctl stop and lsnrctl start from an administrator command window [or Windows Powershell] instead of the Services control panel, but both work.) After that, I was able to connect.
[1]: https://stackoverflow.com/users/979521/brad-rippe
Starting the OracleServiceXXX from the services.msc worked for me in Windows.
For thoses Who are using spring-boot and jdbc for connection.
You have to be careful while writing jdbcUrl in application.properties
With SID in Database connection -
source.datasource.jdbcUrl = jdbc:oracle:thin:#[HOST][:PORT]:SID
With Service name in db connection
globe.datasource.jdbcUrl = jdbc:oracle:thin:#//[HOST][:PORT]/SERVICE
This worked for me :)
For Dbeaver users: try selecting "SID" instead of "Service name" in connection settings.
I had the same problem. For me, just writing
sqlplus myusername/mypassword#localhost
did the trick, doing so makes it connect to the default service name, I guess.
This error can occur when an application makes a new connection for every database interaction or the connections are not closed properly. One of the free tools to monitor and confirm this is Oracle Sql developer (although this is not the only tool you can use to monitor DB sessions).
you can download the tool from oracle site Sql Developer
here is a screenshot of how to monitor you sessions. (if you see many sessions piling up for your application user during when you see the ORA-12514 error then it's a good indication that you may have connection pool problem).
Check to see the database is up. Log onto the server, set the ORACLE_SID environment variable to your database SID, and run SQL*Plus as a local connection.
I resolved this issue in my linux enviroment updating the IP of my machine in /etc/hosts file.
You can verify your network IP (inet end.) with:
$ifconfig
See if your IP matches with /etc/hosts file:
$cat /etc/hosts
Edit your /etc/hosts file, if nedded:
$sudo gedit /etc/hosts
Bye.
what worked for me was really simple, I just needed to initiate the service manually in the "Windows Services" (services.msc in cmd trompt).
my service name is: OracleServiceXXXXX.
I had also faced the same problem and spent 3 days to dig it out.
This happens because of your wrong TNS service entry.
First check whether you are able to connect to standby database from primary database using sql > sqlplus sys#orastand as sysdba (orastand is a standby database).
If you are not able to connect then it is a problem with the service. Correct the entry of service name in TNS file at primary end.
Check standby database the same way. Make the changes here too if required.
Make sure the log_archive_dest_2 parameter has the correct service name.
For those that may be running Oracle in a VM (like me) I saw this issue because my VM was running out of memory, which seems to have prevented OracleDB from starting up/running correctly. Increasing my VM memory and restarting fixed the issue.
Lots of answers here, but here comes a working example with code that you can copy and paste and test immediately:
For me the error 12514 was solved after specifying the correct SERVICE_NAME.
You find that on the server in the file tnsnames.ora which comes with 3 predefined service names (one of them is "XE").
I installed the Oracle Express database OracleXE112 which already comes with some preinstalled demo tables.
When you start the installer you are asked for a password. I entered "xxx" as password. (not used in production)
My server runs on the machine 192.168.1.158
On the server you must explicitely allow access for the process TNSLSNR.exe in the Windows Firewall. This process listens on port 1521.
OPTION A: For C# (.NET2 or .NET4) you can download ODAC11, from which you have to add Oracle.DataAccess.dll to your project. Additionally this DLL depends on: OraOps11w.dll, oci.dll, oraociei11.dll (130MB!), msvcr80.dll.
These DLLs must be in the same directory as the EXE or you must specify the DLL path in: HKEY_LOCAL_MACHINE\SOFTWARE\Oracle\ODP.NET\4.112.4.0\DllPath. On 64 bit machines write additionally to HKLM\SOFTWARE\Wow6432Node\Oracle\...
OPTION B: If you have downloaded ODAC12 you need Oracle.DataAccess.dll, OraOps12w.dll, oci.dll, oraociei12.dll (160MB!), oraons.dll, msvcr100.dll. The Registry path is HKEY_LOCAL_MACHINE\SOFTWARE\Oracle\ODP.NET\4.121.2.0\DllPath
OPTION C: If you don't want huge DLL's of more than 100 MB you should download ODP.NET_Managed12.x.x.x.xxxxx.zip in which you find Oracle.ManagedDataAccess.dll which is only 4 MB and is a pure managed DLL which works in 32 bit and 64 bit processes as well and depends on no other DLL and does not require any registry entries.
The following C# code works for me without any configuration on the server side (just the default installation):
using Oracle.DataAccess.Client;
or
using Oracle.ManagedDataAccess.Client;
....
string oradb = "Data Source=(DESCRIPTION="
+ "(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.158)(PORT=1521)))"
+ "(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=XE)));"
+ "User Id=SYSTEM;Password=xxx;";
using (OracleConnection conn = new OracleConnection(oradb))
{
conn.Open();
using (OracleCommand cmd = new OracleCommand())
{
cmd.Connection = conn;
cmd.CommandText = "select TABLESPACE_NAME from DBA_DATA_FILES";
using (OracleDataReader dr = cmd.ExecuteReader())
{
while (dr.Read())
{
listBox.Items.Add(dr["TABLESPACE_NAME"]);
}
}
}
}
If the SERVICE_NAME=XE is wrong you get error 12514. The SERVICE_NAME is optional. You can also leave it away.
In my case the database had ran out of disk space. Which caused it to not respond. Once I cleared up that issue everything worked again.
I got the same error because the remote SID specified was wrong:
> sqlplus $DATASOURCE_USERNAME/$DATASOURCE_PASSWORD#$DB_SERVER_URL/$REMOTE_SID
I queried the system database:
select * from global_name;
and found my remote SID ("XE").
Then I could connect without any problem.
In my case, round brackets around the SERVICE_NAME was missing in the tnsnames.ora file.
<DBNAME> =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL=TCP)(HOST = nupark-cnvr-ora )(PORT=1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = <DBNAME> ***CLOSING ROUND BRACKET WAS MISSING HERE***
)
)
LISTENER_<DBNAME> =
(ADDRESS = (PROTOCOL = TCP)(HOST = nupark-cnvr-ora)(PORT = 1521))
I had just to replace my connection string
from:
jdbc:oracle:thin:#localhost:1521:xe
To:
jdbc:oracle:thin:#localhost:1521:orcl
For me this was caused by using a dynamic ipadress using installation. I reinstalled Oracle using a static ipadress and then everything was fine
Restarting the VM worked for me
My issue was resolved by replacing the'SID' in URL with 'service name' and correct host.
tnslsnr is up but database is down.
For oracle novice it is not obvious that database may be down while connections are accepted.
I had to start up database manually like that
su - oracle
export ORACLE_SID=XE
sqlplus sys as sysdba
And then in sql console
startup
In my case i failed to startup but got another error message and found the source of a problem - i had to change host name and then database auto startup was functional again.
I have implemented below workaround to resolve this issue.
I have set the ORACLE_HOME using command prompt
(right click cmd.exe and Run as System administrator).
Used below command
set oracle_home="path to the oracle home"
Go to All programs --> Oracle -ora home1 --> Configuration migration tools --> Net Manager --> Listener
Select Database Services from dropdown.
Both Global database name and SID are set to the same (ORCL in my case).
Set Oracle Home Directory.
Oracle Net Manager window example from oracle documentation:
Click on File and save network configuration.
The problem was that my connection string url contained database name instead of SID.
Replacing database name with oracle database connection SID solved this problem.
To know your oracle SID's you can browse tnsnames.ora file.
XE was the actual SID, so this is how my tomcat connection string looks like now:
<Resource
name="jdbc/my_db_conn"
auth="Container"
type="javax.sql.DataSource"
driverClassName="oracle.jdbc.driver.OracleDriver"
url="jdbc:oracle:thin:#//127.0.0.1:1521/XE"
username="test_user"
password="test" />
My server version was "Oracle 11.2 Express", but solution should work on other versions too.
I had a case that I used DBMS where I had to fulfill a db connection form.
I put SID into the Database field and in the dropdown, next to the field, I had had 'Service Name' value instead of 'SID' value.
(normally I don't use Oracle database so I've not been aware of the difference)
That was the reason I got the error message.
The problem can be in the incorrect URL.
For example, I'm using Oracle database (inside VM) with Spring framework and having this issue.
I had in my application.properties file:
spring.datasource.url=jdbc:oracle:thin:#//localhost:1521/orcl12c
But the db version was defferent:
spring.datasource.url=jdbc:oracle:thin:#//localhost:1521/orclcdb
The correct URL can be found in the tnsnames.ora file (this file would be available where the Oracle server, so if you using VM, you should look for this file inside your host VM).
For example for Oracle in the VirtualBox the command to see this file is:
nano /u01/app/oracle/product/version/db_1/network/admin/tnsnames.ora
In my case for Linux environment, the oracle file at ORACLE_HOME/bin was highlighted in "Red" color with different permissions as below:
I changed the permissions of this file as below:
1) Stop Oracle -> sudo systemctl stop oracle.service
2) Change the permission of oracle file at ORACLE_HOME/bin directory as "sudo chmod 777 oracle"
3) Start Oracle -> sudo systemctl start oracle.service
Then after this change, I checked the status of listener using lsnrctl status.Here, I can see the db instances loaded successfully.
However, I can connect using sqldeveloper only, with sqlplus command line I'm getting ORA-12547: TNS Lost Contact error. So, this can a quick workaround to use sqldeveloper.
Note: Take a backup of oracle file before changing the permissions.
My goal is to get my container database into a mount mode to execute a system alter statement to enable flashback functions.
Configuring Your Database for Flashback Transaction
Environment: OS Win 8.1 64-bit, Oracle 12c (12.1.0.2.0) 64-Bit
I verified that both my listener and db service are running.
Listener.log
Tue Sep 08 13:31:42 2015 System parameter file is
C:\OracleServer\product\12.1.0\dbhome_1\network\admin\listener.ora Log
messages written to
C:\OracleServer\diag\tnslsnr\NA-D02979\listener\alert\log.xml Trace
information written to
C:\OracleServer\diag\tnslsnr\NA-D02979\listener\trace\ora_9672_20416.trc
Trace level is currently 0
Started with pid=9672 Listening on:
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.1.105.118)(PORT=1521)))
Listening on:
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
Listening on:
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\.\pipe\EXTPROC1521ipc)))
Listener completed notification to CRS on start
TIMESTAMP * CONNECT DATA [* PROTOCOL INFO] * EVENT [* SID] * RETURN
CODE Listening on:
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=NA-D02979.vgnet.volgrp.com)(PORT=5500))(Security=(my_wallet_directory=C:\ORACLESERVER\admin\CDB1\xdb_wallet))(Presentation=HTTP)(Session=RAW))
Dynamic address is already listened on
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
08-SEP-2015 13:32:25 * service_register * cdb1 * 0 08-SEP-2015
13:33:22 * service_update * cdb1 * 0
Results of SqlPlus
C:\Users\jeff>sqlplus sys/**********#CDB1 as sysdba
SQL*Plus: Release 12.1.0.2.0 Production on Tue Sep 8 13:44:18 2015
Copyright (c) 1982, 2014, Oracle. All rights reserved.
Connected to: Oracle Database 12c Enterprise Edition Release
12.1.0.2.0 - 64bit Production With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
ERROR: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Warning: You are no longer connected to ORACLE.
SQL> startup mount
SP2-0640: Not connected
SQL> ^C
C:\Users\jeff>sqlplus> sys/**********#CDB1 as sysdba
SQL*Plus: Release 12.1.0.2.0 Production on Tue Sep 8 13:46:24 2015
Copyright (c) 1982, 2014, Oracle. All rights reserved.
ERROR: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Enter user-name:
When I connect to my container DB as sysdba, I can issue the shutdown immediate command, but as soon as the database dismounts, the listener no longer knows about the database and I am unable to issue the "startup mount" command.
Listener.ora
SID_LIST_LISTENER = (SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\OracleServer\product\12.1.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:C:\OracleServer\product\12.1.0\dbhome_1\bin\oraclr12.dll")
)
(SID_DESC =
(GLOBAL_DBNAME = CDB1)
(ORACLE_HOME = C:\app\oracle\product\11.2.0\dbhome_1)
(SID_NAME = CDB1)
) )
LISTENER = (DESCRIPTION_LIST = (DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.105.118)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
) )
TNSNames.ora
LISTENER_CDB1 =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
CDB1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.1.105.118)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = CDB1.vgnet.volgrp.com)
)
)
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)
I have defined a static SID to my container database.
Second Round Results
From the following results, I followed what Alex Pool had documented in the answer. I am on the same machine as the database. I have set ORACLE_SID to cdb1, then every time I try to connect, I am getting a ORA-12560: TNS:protocol adapter error. Why is my listener still throwing TNS errors when I am trying to connect based on SID?
C:\Users\jeff>%ORACLE_SID%
'cdb1' is not recognized as an internal or external command,
operable program or batch file.
C:\Users\jeff>sqlplus sys/********** as sysdba
SQL*Plus: Release 12.1.0.2.0 Production on Wed Sep 9 08:05:25 2015
Copyright (c) 1982, 2014, Oracle. All rights reserved.
ERROR:
ORA-12560: TNS:protocol adapter error
Enter user-name: ^C
C:\Users\jeff>sqlplus / as sysdba
SQL*Plus: Release 12.1.0.2.0 Production on Wed Sep 9 08:05:36 2015
Copyright (c) 1982, 2014, Oracle. All rights reserved.
ERROR:
ORA-12560: TNS:protocol adapter error
Enter user-name: ^C
C:\Users\jeff>sqlplus /nolog
SQL*Plus: Release 12.1.0.2.0 Production on Wed Sep 9 08:05:50 2015
Copyright (c) 1982, 2014, Oracle. All rights reserved.
SQL> connect / as sysdba
ERROR:
ORA-12560: TNS:protocol adapter error
SQL>
The listener no longer knows about the service because the database has unregistered itself during shutdown. It still knows about the SID, though that isn't very useful. You can lsnrctl status before and after the shutdown to see the difference.
You said you have defined a static SID, which is true (assuming you're referring to the SID_LIST_LISTENER entries), but you're connecting using the #CDB1 TNS alias, which is defied in your tnsnames.ora to use the service name, not the SID. You may be slightly confused by having the same value as the alias and the SID, but there is no direct relation between them; you could have called the alias something completely different (though it's common to have them the same).
If you're connecting from the same box, set ORACLE_SID to CDB1 and connect locally rather than over SQL*Net, with just:
sqlplus sys/********** as sysdba
Or even
sqlplus / as sysdba
Or
sqlplus /nolog
connect / as sysdba
$ export TWO_TASK =
sqlplus /nolog
conn sys/pass as sysdba
I have installed Oracle 11g DB and 10g Developers suite (need to use forms builder).
I've made a new database called genericName and I'm trying to connect to it using sys/myPasswordChoice/genericName to it from Form builder.
I'm getting the following error:
ORA-12154: TNS could not resolve the connection identifier specified
I've searched the Internet for a solution and it seems that I need to modify something in one of the .ora files.
Any ideas how to fix this error?
Yes even Oracle 6i can connect to 11g!!!
check $oracle_home/network/admin/tnsnames.ora. ($oracle_home is where developer suite is installed)
Add the entry manualy or use net configuration assistant gui tool. The next lines:
apex2 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.53.2.55)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = uni11g)
)
)
describes the tns name apex2 (the one you use in forms to connect), that points to an 11g database installed in 10.53.2.55 ip with the sid uni11g. adapt them to your settings
Often, it's a typographical error in your connexion string or in your tnsnames.ora file (general tnsnames.ora location is: $ORACLE_HOME/network/admin/tnsnames.ora). More information here : 11g/ORA-12154.
I am unable to restart/start/stop TNSListener service. I am getting following error:-
"The OracleDb_10gTNSListener Service on local computer started and then stopped. Some services stop automatically if they have no work to do, for example, the performance logs and Alerts Service". Please help me
Step 1: Check your ip address and copy it.
Step 2: Open (listener.ora) in notepad and replace the HOST ip address with your current ip address.That you copied earlier.
Note: Do not forget to replace the second entry of HOST ip.
Step 3: Now open (tnsnames.ora) with notepad and replace HOST ip address with your current ip address.
Finally start your listner service from windows services or from command prompt.
Hope this will work.
Worked for me.
Open listener.ora file located at C:\oraclexe\app\oracle\product\11.2.0\server\network\ADMIN\
& then check computer name is same as in HOST attribute
Regards
Irshad N
I fixed this issue by replacing the HOST values in the following two .ora files with "localhost". Change [username] to your username. The files may be in a different location on your computer.
Note that there is one change in listener.ora and two changes in tnsnames.ora.
After making the change, I rebooted my computer. I haven't had any problem since.
C:\app[username]\product\18.0.0\dbhomeXE\NETWORK\ADMIN\listener.ora
DEFAULT_SERVICE_LISTENER = XE
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\app\[username]\product\18.0.0\dbhomeXE)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:C:\app\[username]\product\18.0.0\dbhomeXE\bin\oraclr18.dll")
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)
C:\app[username]\product\18.0.0\dbhomeXE\NETWORK\ADMIN\tnsnames.ora
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
)
)
LISTENER_XE =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)
It can also be because of other processes, that are trying to connect through that port. In my case it was because of Apache Tomcat. I changed its starting option to manual in the services and stopped it. And tried starting OracleOraDb11g_home1TNSListener. It was working this time. You can also restart the PC once and check.
Before trying solutions provided by others, first check in your environment settings, if you have correct ORACLE_HOME and ORACLE_SID variable values. Also check in PATH variable, it should be added as ORACLE_HOME/bin.
I have two Oracle versions installed on my machine and I had wrong variable values set in my environment due to which it didn't work.
Came exaclty into the same issue today.
As stated here
https://community.oracle.com/thread/3570067?start=0&tstart=0
, in which the problem reported is about Oracle 12c,
I tried deleting listener.ora located into
C:\app\username\product\18.0.0\dbhomeXE\network\admin
My issue was on local Oracle express 18. I guess this could be a possible solution for many versions.
Worked for me.
In my case the wrong IP was set in hosts:
c:\Windows\System32\Drivers\etc\hosts.
The hostname was pointing to a different IP.
After I changed it to the correct IP the listener worked.