关于“仅获增量一次”

If you select the option 'Only get delta once', then every request in the PSA will only be loaded into the Data target once. For example. If you load a full request into the PSA through an InfoPackage and then load it to the Cube. In a snapshot scenario, when the new full load comes to the PSA you will need to delete the previous request from the cube before loading the new request.

 

But if you delete the previous request from the cube, and not from the PSA - and if you haven't checked the 'Only get delta once' flag, when you execute the DTP, it will load both previous and the new requests from the PSA to the cube. In order to avoid this you have 2 options:

 

1. You can delete a request from the PSA after every successful load into the Cube OR

2. You can check the 'Only get delta once' flag in the DTP so that it won't load any request it has loaded into the cubes previously even if it was deleted from the cube.

 

Using the second option de-couples the PSA maintenance from your regular data loading and also saves you an additional step of deleting the PSA request in your process chain.