Connect To Certain Instance Rac
Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.Provide details and share your research! Asking for help, clarification, or responding to other answers. Convert Single Instance to RAC – Part 1: Duplicate DB using RMAN This article is for users of Oracle Database version 10g+ who want to convert their Oracle single instance database to RAC. I will provide detailed procedure for converting non-RAC database to RAC and we will use Oracle Automatic storage management (ASM) as shared storage. How to unlock a samsung 7.
Connecting to an Oracle RAC system is similar to connecting to a single instance of an Oracle database. When connecting to a single Oracle database instance, you specify the SID or ServiceName of the instance to which you want to connect either in the connection URL or as properties of a DataSource.
Connections can come into the database via several lighter-weight non-Oracle protocols such as ODBC or JDBC. Local versus remote connections with Oracle 12cConnections into the database can be one of two kinds:.Local (bequeath): A local connection originates from the same server the database is on and doesn’t use the database listener process.Remote: All other connections from outside the database server or those from the server using the listener are remote connections. The easy way to determine whether a user is connecting remotely is if you have @TNSALIAS in the connect screen.Communication flow with Oracle 12cConnections to an Oracle database typically come across from a client located away from the database; over a network infrastructure; to the database server; through a database listener process; and, finally, into the database itself. On the client side, the program calling the database references tnsnames.ora to find the database server host and protocol to send the request to. The request then leaves the client and goes onto the network utilization OracleNet. The default port for Oracle Net communications is 1521.
Oracle Connect To Specific Rac Instance
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Over this Oracle Net protocol is where database communications traffic flows between the client and database server.After a client’s communication request reaches the database server host, it’s handed off to the listener. The database listener is a separate Oracle software process on the database server that listens for incoming requests on the defined OracleNet port (1521). When it gets a request, the listener identifies which database instance is targeted for that request and establishes a connection to that database instance.On the server side, the listener uses the listener.ora file to make this determination. When the connection is established and the session begins, the listener steps out of the picture and allows communication between the database and client. Each client session has a dedicated server process on the server side.
Within this dedicated server process, the user’s session code is executed. This represents the communication flow.The client contains the client application and tnsnames.ora file. It communicates to the database server over Oracle Net on port 1521. On the database server, a listener process is configured by way of the listener.ora file. The listener routes the incoming request to the target database instance (either dev11g or db01) and establishes the initial connection handshake between the database instance and client.
How to set up tnsnames.ora with Oracle 12cYou must provide the address or location of the database you’re trying to connect to. PORT is the port the server-side listener process is listening on. It’s also the port you connect across the network on for your OracleNet traffic (thus the firewalls must be open on that port).SERVICENAME is the service name of the database instance you’re attempting to connect to. You can also use SID, although Oracle is promoting the use of SERVICENAME instead.The tnsnames.ora file is text based, and you can edit it by hand.
After making changes, it’s not necessary to restart the database or listener process. How to test the connection with Oracle 12cThe best way to test a connection is via the application, but that isn’t always possible. Preferably, you’re on the client tier and actually go through the same network path as the client applicationsTo execute a connectivity test, follow these steps to determine whether you can connect to the database instance:.Go to the client tier.See whether Oracle client software such as SQL.Plus and tnsnames.ora is installed.Execute a sqlplus username@ tnsalias, such as sqlplus mwhalen@dev12c.Enter the password to connect to the database.Using the tnsping utility is an even faster method that doesn’t require a password. This utility connects over the network via the listener and establishes a handshake. It then terminates the connection and reports the results, which you see here: $ tnsping dev12cTNS Ping Utility for Linux: Version 12.1.0.1.0 - Production on 19-MAY-2013 12:20:07Copyright (c) 1997, 2013, Oracle. All rights reserved.Used parameter files:/u01/app/oracle/product/12.1.0/dbhome1/network/admin/sqlnet.oraUsed TNSNAMES adapter to resolve the aliasAttempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST =localhost)(PORT = 1521)) (CONNECTDATA = (SERVER = DEDICATED) (SERVICENAME = dev12c)))OK (20 msec)Testing connections is a good verification step for the DBA.
If problems occur, it lets you catch them first instead of relying on users to report them later.