Page Appendix File
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When an online dump is running, client worker threads never write to the online dump files. Thus, their performance is not degraded by writing over the network to a remote file system. However, to maintain physical and time consistency of the dump, client worker threads may write pages to a local temporary file with a prefix of ib_dump_. Any database page is guaranteed to be written at most one time to this temporary file. This temporary file is known as the dump or page appendix file.
For very large databases with intensive update activity, the page appendix file could also grow to a very large size. There must be adequate space in the temp directories to handle this storage demand or the online dump will fail. The dump information returned to GBAK about the number of pages written to the appendix file can aid configuration of the temp file space.