HOW i can identify which instance is associated with which Listener

Hi all,
i created one DB instance. suppose named as "B". but there is already another DB instance present. Named as "A".
Then i created one listener for DB instace "B".
Now my Que. is that HOW i can identify which instance is associated with which Listener,.
2) if i create listener then a service also created. if i stopped that service and then can i fire query OR Login again, WHAT will be the expected result.
I tried by asking people for my answer. but not satisfied.
Please Help me For this.
Thanks in Advance

856376 wrote:
i want to start my carreer in DBA.
In what manner i ahve to prepare my self.
Your guidance will help me lot
Thank youLike everything else, the answer is "it depends".
What is your background and experience with computers, networks, operating systems, programming languages?
What are you currently doing?
What formal and or on the job training have you had?
As Aman said, build yourself a test system and play with it. You can do this at no cost by ...
1) download and install VMplayer (vmware.com). It is legally free. For an investment in your career of about US$185, you can buy VMworkstation, which has the same fundamental capability plus some nice management features.
2) download and install Oracle Enterprise Linux (oracle.com). It is legally free. If you want a support contract, you pay for that.
3) using (1) and (2) create a virtual linux server
4) download and install Oracle Enterprise edition database (oracle.com). It is legally free for personal eduction.
5) install (4) on (3).
Beyond the above questions I have some boilerplate replies that fit here . . .
if people want to be professionals in ANY field, the first knowledge they need to acquire is how to locate AND USE+ the fundamental reference materials for that profession. And the most important trait, the one for which they are really hired, is the ability to do independent research, and having a modicum of curiosity that would drive one to do that research. We don't mind helping newbies, and even the most experienced person on this board will run into something they are not familiar with, or occasionally just require a second set of eyes to look at something. But a professional+ needs, above all, a willingness and capability to check the docs. A professional isn't necessarily someone who has all the answers at their fingertips or has a full understanding about every arcane subject in their field. It certainly isn't someone who has an encyclopedia full of memorized answers but little understanding of how it all fits together. It's someone who knows where to find the answers when needed, how to recognize them when he sees them. It's less about knowing than it is about attitude. Everything you asked can be answered in the Oracle Concepts Manual at tahiti.oracle.com. You should bookmark that site.
=================================================
Learning how to look things up in the documentation is time well spent investing in your career. To that end, you should drop everything else you are doing and do the following:
Go to tahiti.oracle.com.
Drill down to your product and version.
BOOKMARK THAT LOCATION
Spend a few minutes just getting familiar with what is available here. Take special note of the "books" and "search" tabs. Under the "books" tab you will find the complete documentation library.
Spend a few minutes just getting familiar with what kind of documentation is available there by simply browsing the titles under the "Books" tab.
Open the Reference Manual and spend a few minutes looking through the table of contents to get familiar with what kind of information is available there.
Do the same with the SQL Reference Manual.
Do the same with the Utilities manual.
You don't have to read the above in depth. They are reference manuals. Just get familiar with what is there to be referenced. Ninety percent of the questions asked on this forum can be answered in less than 5 minutes by simply searching one of the above manuals.
Then set yourself a plan to dig deeper.
- Read a chapter a day from the Concepts Manual.
- Take a look in your alert log. One of the first things listed at startup is the initialization parms with non-default values. Read up on each one of them (listed in your alert log) in the Reference Manual.
- Take a look at your listener.ora, tnsnames.ora, and sqlnet.ora files. Go to the Network Administrators manual and read up on everything you see in those files.
- When you have finished reading the Concepts Manual, do it again.
Give a man a fish and he eats for a day. Teach a man to fish and he eats for a lifetime.

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How to identified which instance is associated with which Listener

Hi all,
i created one DB instance. suppose named as "B". but there is already another DB instance present. Named as "A".
Then i created one listener for DB instace "B".
Now my Que. is that HOW i can identify which instance is associated with which Listener,.
2) if i create listener then a service also created. if i stopped that service and then can i fire query OR Login again, WHAT will be the expected result.
I tried by asking people for my answer. but not satisfied.
Please Help me For this.
Thanks in Advance

see the file listener.ora. path is usually, $ORACLE_HOME/network/admin/listener.ora
You will see which listener is associated with which file,
Details will be usually like this
>
LSNR1 =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = instance1)(PORT = 1666))
LSNR2 =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = instance2)(PORT = 2666))
>
>
if i create listener then a service also created. if i stopped that service and then can i fire query OR Login again, WHAT will be the expected result.
I tried by asking people for my answer. but not satisfied.
>
A listener is used when a client wants to connect to the database server. If you are logging in directly on the server without using instance name, then you can login even if you stop the service.
check this,
C:\Windows\system32>lsnrctl stop
LSNRCTL for 32-bit Windows: Version 10.2.0.3.0 - Production on 03-MAY-2011 23:06
:22
Copyright (c) 1991, 2006, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
The command completed successfully
C:\Windows\system32>sqlplus ganesh
SQL*Plus: Release 10.2.0.3.0 - Production on Tue May 3 23:06:36 2011
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Enter password:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> select * from dual;
D
X
SQL>But if you try to connect from a client, or use the instance name while connectineg
you get the error like this,
SQL> conn ganesh@ganesh
Enter password: ******
ERROR:
ORA-12541: TNS:no listener
Warning: You are no longer connected to ORACLE.
SQL> If you see, I used the instance name @ganesh.
G.

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<REMOVED BY MODERATOR>
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Message was edited by:
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HOW i can identify which instance is associated with which Listener

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