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The progress callback enables the client to be kept up to date as to the progress of a potentially long-running operation (such as DbiBatchMove or DbiQExec). When the client registers the callback, a callback buffer must be supplied. The buffer must be at least as large as sizeof(CBPROGRESSDesc). During query execution, the supplied callback function is called after certain milestones have been reached, giving the client an update on how execution is progressing. The CBPROGRESSDesc structure is stored in the client's call back buffer.

The CBPROGRESSDesc structure contains the following fields: