Database Tutorials MSSQL, Oracle, PostgreSQL, MySQL, MariaDB, DB2, Sybase, Teradata, Big Data, NOSQL, MongoDB, Couchbase, Cassandra, Windows, Linux 
Error:
When clients attempts to connect to the database, they can not connect with the error “ORA-12502: TNS: listener received no CONNECT_DATA from client”.
Reason:
Missing host definition in local_listener parameter.
Solution:
The definition in the local_listener parameter should be changed as follows.
Missing Host Definition:
1 | (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = node-VIP) (PORT = 1521)))) |
Correct Host Definition:
1 | (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = node-vip.domain.local) (PORT = 1521)))) |
If the database is RAC, the definition of sid = ‘XX’ should also be added.
1 | SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=node01-vip.domain.local)(PORT=1521))))' scope=both sid='ORCL1'; |
1 | SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=node02-vip.domain.local)(PORT=1521))))' scope=both sid='ORCL2'; |
