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LOAD_BALANCE=ON in TNS descriptor means that the
client will try to randomly connect to any
of the
dress descriptions in the descriptor, thus evenly spreading the load. On the
other hand, you can have
a
listener based balancing, which is facilitated through the "local_listener"
init.ora parameter. When
the
instance starts up, it attempts to register the dispatchers with any listener
listed in the local_listener
parameter. When a listener encounters a connection
request, it uses a dispatcher from the machine with
the
least CPU load. Listener load balancing is used in the OPS environments where
several nodes are
accessing the same database and the DBA wants to spread
the accesses evenly accross the nodes.
I
did not know about the LOAD_BALANCE=ON . Thanks.
TKS Yechiel for your help,
Two more questions.
Is there any way I can find out which one of the 2
addresses I am using ?
Which is better solution this method or add another
listener ?
Tks for your help
TIA
Ramon
----- Original Message -----
Sent: Wednesday, September 18, 2002
4:09 AM
Subject: Re: Listener load
balance
Hello Ramon
I think that you have an error in your
parameters.
As far as I know (not much) the second network card
have a different TCP/IP address.
You have to put this address in the added line in
listener.ora and add (load_balance=on).
(ADDRESS_LIST
=
(load_balance=on)
(ADDRESS =
(PROTOCOL = TCP)(HOST = myserver)(PORT = 1521))
---> Original
(ADDRESS = (PROTOCOL = TCP)(HOST = new network card address)(PORT =
1526)) ---> Added
)
In the tnsnames you have to use load_balance=on
and put both addresses and ports in the address
list:
(description=
(address list=
(load_balance=on)
(address=(protocol=TCP,host=225.125.110.5,port=1521))
(address=(protocol=TCP,host=new network
card address,port=1526))
This way the clients will use both address.
Yechiel Adar
Mehish
----- Original Message -----
Sent: Tuesday, September 17, 2002
10:19 PM
Subject: Re: Listener load
balance
Tks Kevin,
I didn't setup the DNS to do that. I ping
myserver and is using the new address. Don't know how to do it
either.
What I am planning to do is to set the manually
the ip address to the both port. I am using local
names.
(ADDRESS =
(PROTOCOL = TCP)(HOST = 225.125.100.5)(PORT = 1521))
---> Original
(ADDRESS = (PROTOCOL = TCP)(HOST = 225.125.100.6)(PORT =
1526)) ---> Added
Ramon
----- Original Message -----
Sent: Tuesday, September 17, 2002
12:03 PM
Subject: RE: Listener load
balance
Your HOSTNAME of 'myserver' would tell you
which.
Since you have the same hostname on the listener, both ports
would currently be using the same IP address.
Did you setup DNS so that the cards share a Hostname
?
Hi list,
Scenario Win2000 server, 8.1.7.
I added a network card to my DB Server.
I want the listener to accept connections for the 2 IP address to
make load balance. I just added a line to the listener file
with a different port.
How can I assure that the port 1521 is listening
for the net address 01 and the port 1526 in the address 02
?
Is that correct ?
-----------------------
LISTENER =
(DESCRIPTION_LIST
=
(DESCRIPTION
=
(ADDRESS_LIST
=
(ADDRESS = (PROTOCOL
= IPC)(KEY = EXTPROC1))
)
(ADDRESS_LIST
=
(ADDRESS = (PROTOCOL
= TCP)(HOST = myserver)(PORT = 1521))
---> Original
(ADDRESS = (PROTOCOL = TCP)(HOST = myserver)(PORT =
1526)) ---> Added
)
)
(DESCRIPTION
=
(PROTOCOL_STACK
=
(PRESENTATION =
GIOP)
(SESSION =
RAW)
)
(ADDRESS = (PROTOCOL = TCP)(HOST
= myserver)(PORT = 2481))
)
)
SID_LIST_LISTENER =
(SID_LIST
=
(SID_DESC
=
(SID_NAME =
PLSExtProc)
(ORACLE_HOME =
C:\Oracle\Ora8I)
(PROGRAM =
extproc)
)
(SID_DESC
=
(GLOBAL_DBNAME =
ORCL)
(ORACLE_HOME =
C:\Oracle\Ora8I)
(SID_NAME =
ORCL)
)
)
----------------------------
TIA,
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