Use Oracle NETCA to create the Oracle Net Services profile, or the sqlnet.ora file.

In an Oracle Grid Infrastructure installation, the sqlnet.ora file is located in the following directory by default:

Grid_home/network/admin

For the local listener for the Oracle RAC database instance, the default location of the sqlnet.ora file is $ORACLE_HOME/network/admin directory. In this directory there is a default sqlnet.ora file. Also, you can find a sample sqlnet.ora file in the subdirectory sample.

Oracle Net Configuration Assistant (NETCA) creates the following entry in the sqlnet.ora file:

NAMES.DIRECTORY_PATH=(TNSNAMES, EZCONNECT)

The parameter NAMES.DIRECTORY_PATH specifies the priority order of the naming methods to use to resolve connect identifiers to connect descriptors.