For Ignite to connect to Oracle databases that are specified by a name (tnsnames or LDAP), the following Oracle Network configuration (.ora) files are required
tnsnames.ora (required for name TNSName resolution)
ldap.ora (required for LDAP name resolution)
sqlnet.ora (optional)
tnsnames.ora (required for name TNSName resolution)
ldap.ora (required for LDAP name resolution)
sqlnet.ora (optional)