Introducing the connection modification method of Oracle database

Oracle database is a powerful relational database management system that can realize data storage and retrieval and is widely used in various enterprises and institutions. In daily use, there are some scenarios where it is necessary to modify the database connection method, such as modifying the connection port, changing the transmission protocol, replacing the database instance, etc. This article will focus on these contents to introduce the connection modification method of Oracle database for your reference.

Modify the Oracle database connection port

By default, the Oracle database connection port is 1521. However, in some special cases, the connection port needs to be modified, such as firewall restrictions or other conflicting programs. Modification of the connection port requires the configuration of the Oracle Listener service. The following are the specific steps:

1. Log in to the database and check the status of the current Listener service:

lsnrctl status

2. Close the current Listener service:

lsnrctl stop

3. Edit the Listener.ora file and find the following code segment:

 (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))

Change "1521" to another port number, such as "1555", save and exit.

4. Start the new Listener service:

lsnrctl start

5. Confirm that the service is restarted and listen to the new port:

lsnrctl status

Above steps This completes the modification of the Oracle database connection port. At this time, the application also needs to modify the connection method accordingly and change the port number to a new value.

Modify Oracle database transmission protocol

Oracle database uses TCP/IP protocol for data transmission by default, but in some occasions with higher security requirements, the more secure protocol SSH (Secure Shell) can be used ) to transfer the database connection. SSH can provide a more secure encryption mechanism, making data transmitted on the network more difficult to steal or hijack. The following are the steps to implement the SSH protocol for Oracle database connection:

1. Download and install an SSH client, such as PuTTY or Xshell, etc.
2. Open the SSH client, enter the IP address and SSH port number of the database server, and click "Connect".
3. Enter SSH login information and password to connect to the server.
4. Open the Oracle client tool, connect to the database instance, and enter the connection information.
5. In the "Advanced Options" menu, select the "Advanced" tab, select the SSH channel in "Data Transfer", and enter the SSH login information.
6. Click "Connect" to connect to the Oracle database instance.

The above is the method of using SSH protocol to connect to the Oracle database. Note that this method requires the use of an SSH client and relevant settings in the Oracle client tool.

Modify Oracle database instance

In some cases, users need to connect to a different Oracle database instance, such as a new test environment or production environment. The following describes how to modify the Oracle database instance:

1. Close the currently connected database client tool.
2. Edit the tnsnames.ora file of the Oracle client, find the configuration items of the corresponding instance, and modify the instance name, IP address, port and other information.
3. Save the file and exit.
4. Open the Oracle client tool and reconnect to the database instance.

Note that to modify an Oracle database instance, you need to know the new instance parameters first. At the same time, when editing the configuration file, you need to pay attention to the distinction between the configuration items of each instance.

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