Multiple listener

Question

hi,
I hav one doubt regarding listener .question is,
is it possible to run more than one listener at a time?
so far i know is only one listener can be run at a time and can listen for more than one database.
But in the document itz given that "multiple listeners can also listen on behalf of a single database to perform load balancing".so i didnt understand at this point.....
so is it possible to run more than one listener.
can any one explain me abt this plz?
With Regards
Boo

Answer 1

After configuring as you said :
Still I Am not able to tnsping to 9i through 10g
#tnsnames at 10g
test=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = surbhi)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = aj)
Tnsping fails
C:\oraclexe\app\oracle\product\10.2.0\server\BIN>tnsping test
TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 07-DEC-2
006 11:00:47
Copyright (c) 1997, 2005, Oracle. All rights reserved.
Used parameter files:
C:\oraclexe\app\oracle\product\10.2.0\server\network\admin\sqlnet.ora
TNS-03505: Failed to resolve name
Albeit listesner configured as you stated above
LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on
LSNRCTL> STATUS
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))
STATUS of the LISTENER
Alias listener
Version TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Produ
ction
Start Date 07-DEC-2006 10:49:32
Uptime 0 days 0 hr. 3 min. 15 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Default Service XE
Listener Parameter File C:\oraclexe\app\oracle\product\10.2.0\server\network\a
dmin\listener.ora
Listener Log File C:\oraclexe\app\oracle\product\10.2.0\server\network\l
og\listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC_FOR_XEipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=surbhi.Secf.com)(PORT=1522)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=8081))(Presentation=
HTTP)(Session=RAW))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "XE" has 2 instance(s).
Instance "XE", status UNKNOWN, has 1 handler(s) for this service...
Instance "xe", status READY, has 1 handler(s) for this service...
Service "XEXDB" has 1 instance(s).
Instance "xe", status READY, has 1 handler(s) for this service...
Service "XE_XPT" has 1 instance(s).
Instance "xe", status READY, has 1 handler(s) for this service...
The command completed successfully
LSNRCTL> SET CURRENT_LISTENER LISTENER_9
Current Listener is LISTENER_9
LSNRCTL> STATUS
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC0)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 9.2.0.1.0 - Produc
tion
Start Date 06-DEC-2006 16:48:31
Uptime 0 days 18 hr. 4 min. 50 sec
Trace Level off
Security OFF
SNMP OFF
Listener Parameter File C:\oracle\ora92\network\admin\listener.ora
Listener Log File C:\oracle\ora92\network\log\listener.log
(ENDPOINT=(HANDLER=(HANDLER_MAXLOAD=0)(HANDLER_LOAD=0)(ESTABLISHED=0)(REFUSED=
0)(HANDLER_ID=010F2F81353C-4C91-91B2-1A5002AB870D)(PRE=any)(SESSION=NS)(DESCRIPT
ION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC_FOR_XEipc)))))
The command completed successfully