As an aside, this is how Apple syncs Core Data to iCloud (and then to multiple iOS devices) if the backing store uses SQLite (the default). When a small amount of data changes (which is common), the changes get send out, not the entire (mostly unchanged and potential huge) database.
Jeff > On May 6, 2016, at 7:43 AM, Simon Slavin <slavins at bigfraud.org> wrote: > > Believe it or not, the fastest way to synchronise the databases is not to > synchronise the databases. Instead you keep a log of the instructions used > to modify the database. You might, for example, modify the library that you > use for INSERT, DELETE and UPDATE commands to execute those commands and also > save the command to another 'commandLog' table
