Which configuration should set in tnsnames.ora

Question

Dear All,
Need ur help. I with zero knowledge in oracle. Now i need to conenct to Oracle Database from my window server via SQLPlus, which configuration should i set in my tnsnames.ora? A or B?
Set A
PNTP =
(DESCRIPTION =
(LOAD_BALANCE = on)
(FAILOVER=on)
(ADDRESS_LIST=
(SOURCE_ROUTE=yes)
(ADDRESS = (PROTOCOL = TCP)(HOST = Hostname1)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = Hostname2)(PORT = 1521)))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = pntp)
Set B
PNTP =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Hostname1)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = Hostname2)(PORT = 1521))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = pntp)
)

Answer 1

How can i make sure the pointer are D:\oracle\ora92\network\ADMIN and not another folder? Can check from "environment variables "? WHich part?I suggest you go back to the documentation and read.
Please look at following:
http://download.oracle.com/docs/cd/B19306_01/install.102/b14312/post_install.htm#CHDBIHEE
Then, on each client computer, configure either of the following settings:
      Set the TNS_ADMIN environment variable to specify the location of the tnsnames.ora file and specify a service name from that file.
      Place the tnsnames.ora file in the ORACLE_BASE\ORACLE_HOME\network\admin directory, and make sure that the ORACLE_HOME environment has been set to this Oracle home.Your tnsnames.ora file must contain the following assuming you have (n) number of nodes:
PNTP =
(DESCRIPTION =
(LOAD_BALANCE = on)
(ADDRESS_LIST=
(ADDRESS = (PROTOCOL = TCP)(HOST = Hostname1-vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = Hostname2-vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = Hostname(n)-vip)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = pntp)
)Please mark the questions as helpful and correct and close the thread as answered.
Regards.
Edited by: user11150436 on Mar 21, 2011 8:54 AM