Online
A RPD file can be opened either in offline or online. If there are some minor changes to be done like renaming a column, services (BI Server) need not be restarted and can be performed by opening .rpd in online mode. Changes are slow in online and reload server metadata must be clicked for new updated data in Answers page. Renaming of a column can be done in presentation layer (uncheck use logical name).
Offline
For performing major changes to data .rpd file must be opened in offline. For offline changes to be made close RPD stop the BI server then open the RPD. Offline changes are quick but interrupt the services. File>open>offline/online.
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