SQL*Developer can be used to migrate some non-Oracle databases but it doesn't support the SolidDB database.
The following note available in My Oracle Support describes some alternative options -
How To Migrate Non-Oracle Databases For Which A Migration Workbench Option Is Not Available (Doc ID 393760.1)
Basically, the options are -
1. Use a gateway that supports the non-Oracle database or generic connectivity if a third party ODBC driver is avaible to do a "create table as select...."
2. Use the SQL*Plus COPY command to copy data from the non-Oracle database to the Oracle database using a gateway or generic connectivity.
3. Load the non-Oracle data into flat files and use SQL*Loader to put the data into Oracle tables. Again manual work is required for the other objects.
4. Review the section -
Finding More Help: Oracle Migration Partners and Support
on the SQL*Developer Migration Workbench site at -