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 Block Diagram: Loading and Unloading Data 

The following block diagram illustrates the database software components that are involved when you load and unload data, and shows how they work together with an external backup tool.

Description of the Load Process

The Loader client is used to send the command that loads the data; this calls the Loader Server program. The Loader Server then creates the pipes. At the same time, it calls the external backup tool and tells it from which external backup tool to load the data. The client of the external backup tool requests the specified backup medium from the backup server. The backup server gets the medium, reads the data to be loaded from the backup medium, and transfers the data to the client of the external backup medium. The client writes the data sequentially to the pipes. There the Loader Server reads them and loads them into the database instance.

Description of the Unload Process

The Loader client is used to send the command that unloads the data; this calls the Loader Server program. The Loader Server then creates the pipes. The Loader Server starts to unload the data and write it sequentially to the pipes. At the same time, it calls the external backup tool. The backup tool reads the data sequentially from the pipes and saves it on a permanent medium.

 

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