Input string was not in a correct format.
Source: "VirtualMachinePerformance" table
1. Backup the “EsxWebService.dll” file found in “\Spotlight\plug-ins\DatasourceESX” directory.
2. Extract file attached to this solution into the above directory.
3. Restart Spotlight and make a connection to a database instance.
Waiting for fix in a future release of Spotlight on Oracle.