A change log aggregation and optimization mechanism and methodology for updating
and synchronizing application data and application files in a client device of
a data transfer and synchronization system. The contents of a plurality of change
logs reflecting the then current changes to the application data of the client
device are downloaded and merged into an aggregate log. Instead of applying each
change log as it is downloaded, the contents of the aggregate log, representing
all changes to application data and/or application files recorded in prior change
logs, are then applied to the client device to update application data and/or application
files in the client device.