Selecting a Default Connection to be used when Opening SQL files
You can select a connection in Oracle Database Explorer to be the default connection. This connection will be used when a SQL file is opened that is not explicitly associated with a connection. For example, when opening folders containing many SQL scripts this will associate the connection with all of them, saving you from having to associate each file with a connection.
To set a connection as default (replacing any existing default connection):
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                        Create a connection in Oracle Explorer. See Connecting to Oracle Database. 
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                        Right click on the connection and choose Set as Default Connection. The icon will change to indicate that the connection is now default. 
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                        Alternatively, in the connection dialog, check the Set as default connection check box. 
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                        To unset the default connection (so that there is no default), right click on the connection and choose Unset as Default Connection. 
Parent topic: Getting Started with Oracle Developer Tools for VS Code