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Before comparing Oracle databases, you will need to add them must add Oracle connections to the workspaceWorkspace. The Add Databases functionality can be Connection functionality is accessed from the ribbon (the Home tab) or from the Add Databases action link Oracle Connection link at the top left section of the Workspace tab.

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On the Add Database dialog Connection window, choose the server where you want the new database(s) to reside. You can click on the Refresh item of the database drop down to discover the instances running on your network. If the application is not able to discover the instance you are looking for because it is not exposing itself or it is not running on your local area network, or it is not listening on the default port, then you can type in [ServerName or IP Address]\InstanceName on the drop-down box. If the server is not listening on the default port you can also specify a custom port on the following format: [ServerName or IP Address]\[Instance Name],[PortNumber]

Once you have chosen the server and the authentication method (including login name and password if you chose database authentication), you can click Refresh at the top of the Databases box at which point the application will connect to the server using the information you provided and populate the Databases box with the list of all user databases in that server. You can select one or more databases to add to the workspace.

By default, IDERA Schema Compare will use the connection properties set at the Application Settings, however, you can change the connection properties for this server only if you need to.

you can specify:

• Connection Name. A name for the Oracle connection.
• Authentication type. Indicates whether you want to use Oracle or operating system authentication. If Oracle authentication is specified, you also must complete the Username and Password fields.
• Role. Indicates the set of privileges associated with the connection. You can choose default, SYSDBA, or SYSOPER.

In the Basic Settings tab, you can choose the connection type and specify settings required by the connection. There are four connection type you can choose from:

• Basic Connection. Requires the name or IP of the host system for Oracle database, the port number and the service name. If the port number is 0, the default port 1521 will be used.
• TNS Identifier. Requires a connect identifier that exists in the Oracle tnsnames.ora. You cannot use this type of connection to establish a connection to a remote Oracle database. The file tnsnames.ora must exist on the local system.
• Easy Connect. Requires an easy-connect string for the Oracle database. The format of the easy-connect string is username/password@[//]host[:port][/service_name]. Because the username and password are already included in the easy-connect string, the credentials specified at the top section of the Add Connection form are ignored when the easy-connect option is selected.
• Service Descriptor. Requires a connect descriptor in the format:

(DESCRIPTION =
     (ADDRESS_LIST =
          (ADDRESS =
               (PROTOCOL = TCP)(Host = <hostname>)(Port = <port>)))
     (CONNECT_DATA = (SERVICE_NAME = <sid>))
 )

The Test Connection link allows you to verify whether the settings are correct and the connection to Oracle database can be established. You can add Oracle connection to the workspace by clicking OKIn the Other Properties edit box, you can specify additional connection properties as name=value pairs separated by semicolons: name1=value1;name2=value2;...