Scan Listener :
* we add or remove a node from cluster,it was required to changes the connection setting in client
( applicaton ) by configuring the connection using SCAN NAME this problem is eliminated.
* Irrespective number of nodes oracle recommands to have 3 SCAN IP's and one SCNA NAME which be decide to any of the SCAN IP i round rabin manner.
* the Benifit is clients using SCNA do not need to change if you add or remove nodes in the cluster.
* SCAN is a single network name that resolves theree different IP's registered in DNS or GNS.
* if we are using DNS scan listener ip's will store in
/etc/resolv.conf
* how to start the scan listener
$ srvctl start scan_listener -i 2
VIP ( Virtual IP ) :
* VIP is a alternate VIP address assigned to each node,
* In a cluster during a node failure vip of the failed nodes moves to surving node and relay to the applicaton,
* how to start the vip
$ srvctl start vip -i Vip_name -v
* we add or remove a node from cluster,it was required to changes the connection setting in client
( applicaton ) by configuring the connection using SCAN NAME this problem is eliminated.
* Irrespective number of nodes oracle recommands to have 3 SCAN IP's and one SCNA NAME which be decide to any of the SCAN IP i round rabin manner.
* the Benifit is clients using SCNA do not need to change if you add or remove nodes in the cluster.
* SCAN is a single network name that resolves theree different IP's registered in DNS or GNS.
* if we are using DNS scan listener ip's will store in
/etc/resolv.conf
* how to start the scan listener
$ srvctl start scan_listener -i 2
VIP ( Virtual IP ) :
* VIP is a alternate VIP address assigned to each node,
* In a cluster during a node failure vip of the failed nodes moves to surving node and relay to the applicaton,
* how to start the vip
$ srvctl start vip -i Vip_name -v
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