1. Tnsping Is Not Recognized Cmd

Oracle NET Client Server configurationAn is represented to clients as a service; that is, the database performs work on behalf of clients. The service name is included in the connect data part of the connect descriptor. To connect to a database service, clients use a connect descriptor that provides the location of the database and the name of the database service. The address portion of the connect descriptor is actually the protocol address of the listener. To connect to a database service, clients first contact a listener process that typically resides on the database server.

The listener receives incoming client connection requests and hands these requests to the database server. Once the connection is established, the client and database server communicate directly. Ping database host IPping 11.222.333.44If it works, go to the next step;If not, check the server availability Ping database hostnameping orcl.dadbm.comif it works, go to the next step;if not, something wrong with DNS /ACTIVE directory = try using hosts file Test if listener port is reachable/opened for your remote connectionFor that use telnet utility which is available on Unix and can be enabled on Windows.1. Linux example:$ telnet orcl1.dadbm.com 1522Trying 10.126.247.11.Connected to orcl.dadbm.com (12.222.333.44).Escape character is '^'.getConnection closed by foreign host.2.

Tnsping Is Not Recognized Cmd

Windows example1) First enable telnet on Windows 7 if it’s not there:pkgmgr /iu:'TelnetClient'2) Check the database porttelnet orcl1.dadbm.com 1523= no output in case of a port opened; in case of a failure – see below Oracle error:Could not open connection to the host, on port 1523: Connect failedIn case the database listener port is not reachable you face potentially a firewall issue. There are at least two solutions of this problems.Both described in one of and in Demos on. Test Oracle Net connectivity – tnspingThe Oracle Net Listener is the gateway to the Oracle instance for all nonlocal user connections. A single listener can service multiple database instances and thousands of client connections. Tnsping is the Oracle Net equivalent of the TCP/IP ping utility. It offers a quick test to verify that the network path to a destination is good. The utility validates that the host name, port, and protocol reach a listener.

Hi Kirill, your article is very informative.I have an oracle12c database setup on my windows 8 machine & I am trying to access this database through JDBC from ubuntu(Linux) machine present in local area network. When am trying to establish connection through JDBC, getting the following exceptionThe network adapter could not establish connection.I have ensured the following. Disabled the firewalls between both the machines. The URL is proper & I tired using both hostname as well as ip address. Listener is up and running on port 1521.(lsnrctl stat shows the listener is READY)I have done extensive google search about this. Thanks in advance. Please let me know if you need more details.

Hi Kirill,Your article is very really helpful. Hi Sir Kirill,I found a problem with your EZCONNECT examplesqlplus user@’//orcl.dadbm.com:1521/orcl’Because of its usefulness I like EZCONNECT but I never was able to connect to a database without put the password in the connection string like your example.I made my tests using databases servers from 10.2.0.2 to 11.2.0.3.8 and full client version 11.2.0.1.

I think that both client and server side TNS configuration are ok because if I try to connect using EZ and providing the password works. If I use your example (EZ without password ) SQL.Plus blames me and prints its the ‘USAGE’ message like when you mistype some keyword.I have to avoid to use the password to establish a db session because of an internal rule of ours (i.e. No one should see any passwords on the shell history )Best Regards,Aurelio.

Dear Kirill,Am getting error when testing a DB link to a remote server – ORA-12170: TNS:Connect timeout occurredBut ping, telnet, tnsping are successful. But when i create a db link & test the connectivity it fails. 🙁When I try ‘sqlplus username@connectionname’ then same error.tnsnames.ora has entry for the target system, by using the same am able to connect to target system from other DB server.Server from where i tried DB Link:———————————————Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 – 64bit ProductionTNS FOR IBM/AIX RISC SYSTEM/6000: VERSION 11.2.0.4.0 – PRODUCTIONHope you can give me a possible root cause. Thanks in advance!. Krill,Informative article.Below is my issue.

I am connecting to Oracle database through c3p0 from Java application.We have as many as 18 servers and the below issue occurs in 4 servers.Even when we kill our application, still the DB connections are not going down from the server.We are not seeing any connection from application end. What settings I need to check for this.Will it be a Network/Firewall issue, If so how to conclude this and what settings I need to check in the Linux ServerThanks,Mouli.

Free, light-weight, and easily installed Oracle Database tools, libraries and SDKsOracle Instant Client enables applications to connect to a local or remote Oracle Database for development and production deployment. The Instant Client libraries provide the necessary network connectivity, as well as basic and high end data features, to make full use of Oracle Database. It underlies the Oracle APIs of popular languages and environments including Node.js, Python and PHP, as well as providing access for OCI, OCCI, JDBC, ODBC and Pro.C applications. Tools included in Instant Client, such as SQL.Plus and Oracle Data Pump, provide quick and convenient data access.