How will happen b/w scan_listener and node_listener communications
Hello gurus,
Appreciate if you try to answer questions,
1 lets say that a connection request is listener scan, scan find that less loaded listener node say node 1, what listener scan will do if it finds that this listener node is down on node 1?
2. If any scan_listener can hand-off to any node_listener in the cluster, then why there are several scan_listener/scan_vips? In this case, a single scan_listener is quite right, in my view, there is no concept of "switch" for scan-vip/scan_listener, they will use the somewhere in the cluster without worries
3 and how to scan listener will identify the good node_listener, if a node is to have several node_listeners?
4. the scan-vip and VIP node will be place of similar interfaces void (eth0: 1 & eth0:2) public interface (eth0). Then why scan-vip can contain scan_listener on any node, why can't not node-vip can contain listener node when failed over to the other node?
5. by what IP? VIP or Pub - IP? The scan_listener communicates with node_listener?
6. a node_listener at the JRC will be held on two endpoints by default (VIP/TCP/1521 & PUBIP/TCP/1521), if for some reason that VIP is failed over to the other node, then why not not the listener continues to run the existing pub - ip?
Ex:
Summary of endpoints listening...
(DESCRIPTION = (ADDRESS = (PROTOCOL = ipc) (KEY = LISTENER)))
(DESCRIPTION = (ADDRESS = (PROTOCOL = tcp)(HOST=192.168.1.132) (PORT = 1521)))
(DESCRIPTION = (ADDRESS = (PROTOCOL = tcp)(HOST=192.168.1.111) (PORT = 1521)))
Thank you
Uday
Hi Uday,
I'll try to respond to some:
> 1.Lets say a connection request is scan listener, scan find that less loaded listener node, node 1, what listener scan will do if it finds this listener node is down on the Node1?
If the listener to scan detects a listener as inactive node, he will provide the connection to another node.
> 2. If any scan_listener can hand-off for any node_listener in the cluster, then why there are several scan_listener/scan_vips? In this case, a single scan_listener is quite right, in my view, there is no concept of "switch" for scan-vip/scan_listener, they will use the somewhere in the cluster without worries
If you have your scan name registered in DNS with only 1 ip, only 1 scan_listener will be there. Several headphones scan are to balance the load.
If you have only 1 vip scan when there will be only a single scan_listener, and if there is a problem of config on the side of the grid, there will be a time to full stop. This is another reason to suggest several scan-VIP.
> 3. and how scan listener will identify the good node_listener, if a node is to have several node_listeners?
First PMON resumed local details listener of the parameter LOCAL_LISTENER init and tell him "hey local of listening, I also run on the same server as you and I run the following services.» So, if you get requests for connection to these services put back them. "
Second PMON takes over the points of remote_listener parameter (should be) to the nom_analyse and the PMON will talk to the scan_listeners and updates on services and the local listener running on this node. If you have a 3 scan_listeners, each of them will be updated with details by respective PMONs.
SYS:AINTPRD1 > show parameters remote NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ remote_listener string tprod-scan:1521
Now, when the Scan listener receives a connection from a client request it transmits to the less loaded local_listener, which in turn forks a process in the foreground.
>> 4. The scan-vip and VIP node will be similar void upward of interfaces (eth0: 1 & eth0:2) public interface (eth0). Then why scan-vip can contain scan_listener on any node, why can't not node-vip can contain listener node when failed over to the other node?
The scan-vip and VIP node are for different features but are used for similar purposes. In a 10 RAC node, you need 10 knots-VIP, but only 3 scan-VIP is necessary.
Earlier in 10 gr 2 input TNS, we use a series of 10 hostname-vips(for a 10 node RAC) to make the failover of connections to other nodes of the 1st node is not available.
In 11 GR 2 input TNS we use scan-name so that you don't have to mention every 10 hostname-VIP.
> 5.Via what IP? VIP or Pub - IP? The scan_listener communicates with node_listener?
The scan_listener will share with what IP never the local_listener runs on.
>> 6. A node_listener at the JRC will be held on two endpoints by default (VIP/TCP/1521 & PUBIP/TCP/1521), if for some reason that the VIP is failed over to the other node, then why not not the listener continues to run the existing pub - ip?
A failover to the other node hostname-vip when this host is not available. If the host is not not accessible to the general public then why the scan_listener would continue on that.
Don't forget that scan-VIP is not associated with a specific interface on any node. They hop in the grid depending on availability.
HTH,
J J
Tags: Database
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