Patent attributes
Some embodiments provide a method for migrating data from a first database to a second database. The data is susceptible to change at the first database before all of the data is migrated to the second database and is available for access through the second database. The method transfers segments of data incrementally from the first database to the second database and generates a first digital signature for each transferred segment. The method identifies a set of transferred segments that have been modified in the first database before the data is available for access through the second database by generating a second digital signature for each transferred segment in the set and comparing the second digital signature for the segments with the first digital signature for the segments. The method transfers the modified segments from the first database to the second database in order to replace the previously transferred segments.
