Must PMON use tnsnames.ora to locate none-defualt listener?

Question

Hi,
I just want to confirm this because it is said tnsnames.ora only used for client. So I am a little confused by this usage.
Please give some explanation about this.
Thanks in advance.
Br
Martin

Answer 1

tqma wrote:
Hi,
I notice this, "Clients and database servers (that are clients of other database servers) use the net service name when making a connection with an application."
The statement also tells me that tnsnames.ora only is used for client role.
Ok, my question comes from these operations;
1. I modify the listener.ora, adding a new none-default listener, such as on port 1899.
2. When I want to register an instance to this new listener by statements of "alter system set local_listener=...; alter system register;", it fails.
More details, for example, I add these codes in listener.ora
TXT_LIS=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = fztxt)(PORT = 1525))
Then I issue command "alter system set local_listener=txt_lis;". This command will fail.
I need to add this in tnsnames.ora; "Txt_lis=(ADDRESS = (PROTOCOL = TCP)(HOST = fztxt)(PORT = 1525))";
After adding the entry in tnsnames.ora, the problem is solved. When I google this, it's said PMON needs tnsnames.ora to do name resolution.
I think PMON is a server process. So I ask if tnsnames.ora is necessary for server side in this circumstance.Since it is contacting the listener, it is acting in client role at that point.
OK, maybe that's splitting a hair a bit to fine ...
I'd say OK, there is one single, not often used, time when a server process uses tnsnames. But 99.999999% of the time, when people are trying to debug connection problems and can't keep straight in their mind the difference - in location and function - between client and server processes . . . it's true enough to tell them the tnsnames is used only by client processes.
>
Br Martin
Edited by: tqma on May 25, 2011 10:10 AM
Edited by: tqma on May 25, 2011 10:13 AM