How to configure the database connection file in PLSQL?

In PL/SQL, you can configure the database connection file using the following methods:

1. Open PL/SQL Developer, go to the “Tools” menu and select “Preferences”. In the pop-up window, choose the “Database” tab and configure the database connection information in the “Connection” section, including the database username, password, host name, and port number.
2. Connect to files using PL/SQL Developer: Within the installation directory of PL/SQL Developer, there is a file named “connections.xml” that can be opened with a text editor to manually configure database connection information. Add a new tag in the file and configure the database connection information within the tag.
3. To use Oracle SQL Developer, open the application and click on the “Tools” menu. Choose “Preferences” and then select the “Database” option in the pop-up window. Next, navigate to the “Advanced” tab and configure the database connection information in the “Connection” section.
4. To use the tnsnames.ora file: there is a file named tnsnames.ora located in the ORACLE_HOME/network/admin directory. You can open this file with a text editor and manually configure the database connection information. You can add a new connection descriptor in the file and configure the database connection details like database name, host name, and port number.

Please note that the configuration information in the above methods may vary depending on the specific database and tool versions. It is recommended to choose the appropriate method for configuration based on your actual situation.