[root@yesil db_1]# locate tnsnames.ora
/u01/app/oracle/product/11.1.0/db_1/hs/admin/tnsnames.ora.sample
/u01/app/oracle/product/11.1.0/db_1/network/admin/samples/tnsnames.ora
/u01/app/oracle/product/11.1.0/db_1/owb/network/admin/tnsnames.ora