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27/10/2020

What is the difference between remote listener and local listener?

What is the difference between remote listener and local listener?

A local listener is a listener on the same host as the database instance. A remote listener is a listener on a different (remote) host from the database instance.

What is local listener?

LOCAL_LISTENER is a listener that is running on the same machine as this instance. REMOTE_LISTENER is a listener that is not running on the same machine as this instance. Local Listener and Remote Listener concept comes with ORACLE RAC where a single database has multiple instances.

What is the use of remote listener in Oracle RAC?

A remote listener is a listener residing on one computer that redirects connections to a database instance on another computer. For example, SCAN listeners are remote listeners. In Oracle RAC environments, Oracle recommends that you let the Oracle Agent manage the Oracle listeners for the databases.

What is Sid_list_listener?

The SID_LIST_LISTENER section identifies each database instance that the listener will service connections for. It lists the global database name, ORACLE_HOME, and SID. With this method, each user connection uses a shared process rather than a dedicated server process on the database server.

What is local listener in Oracle RAC?

The local listener, or default listener, is located in the Grid home when you have Oracle Grid Infrastructure installed. If you modify the value of the LOCAL_LISTENER parameter, then the Database Agent process does not automatically update this value. …

What is difference between scan IP and VIP?

SCAN virtual IP addresses (VIPs) function like node VIPs. However, unlike node VIPs, SCAN VIPs can run on any node in the cluster. Clients (users or applications) that connect using a SCAN instead of a node VIP name or address do not have to update the list of node names or addresses in their local tnsnames.

How do I turn off local listener?

If your Oracle configuration is not RAC enabled, you may as well remove the LOCAL_LISTENER parameter from your spfile in case for default port 1521 . SQL> alter system set local_listener='(ADDRESS = (PROTOCOL=TCP)(HOST=192.168. 2.210)(PORT=1521))’; System altered.

What is the use of Local_listener in Oracle?

LOCAL_LISTENER specifies a network name that resolves to an address or address list of Oracle Net local listeners (that is, listeners that are running on the same machine as this instance). The address or address list is specified in the TNSNAMES. ORA file or other address repository as configured for your system.

How do I set up local listener?

You can set the local listener parameter as follows. Syntax: ALTER SYSTEM SET LOCAL_LISTENER=[“]listener_address[“][,…]; ALTER SYSTEM SET LOCAL_LISTENER='(ADDRESS=(PROTOCOl=TCP)(HOST=HOSTNAME/IP_ADRESS)(PORT=1521))’ SCOPE=BOTH; ALTER SYSTEM SET LOCAL_LISTENER='(ADDRESS=(PROTOCOl=TCP)(HOST=192.168.

How do I change the local listener port in RAC?

Change Listener ports RAC with MGMTDB

  1. Check the listener status [[email protected] ~]$ srvctl status listener -l LISTENER Listener LISTENER is enabled Listener LISTENER is running on node(s): node1,node2.
  2. Modify the listener [[email protected] ~]$ srvctl modify listener -l LISTENER -p 1525.

What’s the difference between a local listener and a remote listener?

LOCAL_LISTENER is a listener that is running on the same machine as this instance. REMOTE_LISTENER is a listener that is not running on the same machine as this instance.

What can listener do if local instance is over loaded?

If local instance is over loaded then listener can use TNS redirect to redirect client request to a less loaded instance means remote instance. This Phenomenon is also called as Server Side Load balancing.

Which is the alias for remote listener in lisener?

Use listener_ as the alias name for the local listener, and listeners_ for the remote listener alias. The SERVICE_NAME=VIS is standing for the 4 RAC instances : VIS1, VIS2, VIS3 and VIS4.

How does local listener work in Oracle Database?

Listener uses the advisories to decide which instance should service client request. If listener get to know from advisories that its local instance is least loaded and should service client request then listener passes client request to local instance.