ORA-12505: TNS:listener does not currently know of SID given in connect descriptor

Hi,

Sometimes You can get ” ORA-12505: TNS:listener does not currently know of SID given in connect descriptor ” error.

Details of error are as follows.

ORA-12505: TNS:listener does not currently know of SID given in connect descriptor



Cause: The listener received a request to establish a connection to a database or other 
service. The connect descriptor received by the listener specified a SID for an instance 
(usually a database instance) that either has not yet dynamically registered with the 
listener or has not been statically configured for the listener. This may be a temporary 
condition such as after the listener has started, but before the database instance has 
registered with the listener.

Action:- Wait a moment and try to connect a second time.

- Check which instances are currently known by the listener by executing: 
lsnrctl services <listener name>

- Check that the SID parameter in the connect descriptor specifies an instance 
known by the listener.

- Check for an event in the listener.log file.

Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

This error is related with the listener and registered services of database. Check listener status

$ lsnrctl status listener

Listener should be always started.

Check listener services which services are listening.

lsnrctl services <listener name>

Check the SID parameter known by the listener. If the right SID specified or not in the listener status.

If the related service name and instance don’t exist in the listener status, then set it in the database and register it to database as follows.

SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.63.34l)(PORT=1521)))' scope=both;

SQL> alter system register;

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

https://ittutorial.org/oracle-database-19c-tutorials-for-beginners/