Fuzzy image copying

• When this operation is initiated, the location of the begin_chkpt record of the most recent complete checkpoint is noted and remembered along with the image copy data. This checkpoint is called image copy checkpoint.
• The assertion that can be made based on this checkpoint information is that all updates that had been logged in log records with LSNs less than minimum ( minimum(RecLSNs of dirty pages of the image-copied entity in the image copy checkpoint's end_chkpt record), LSN(begin_chkpt record of the image copy checkpoint) would have been externalised to nonvolatile storage by the time of the fuzzy image copy operation began.
• Therefore, the-image copied version of the entity would be at least as up-to-date as of that point in the log. This point is called as the media recovery redo point.