4 ms·

Thanks, that's helpful! Regarding locking the database rows, I'm a little unclear about how that helps? Is the idea that once a record has been migrated from m

by vosper 7y ago

Thanks, that's helpful! Regarding locking the database rows, I'm a little unclear about how that helps? Is the idea that once a record has been migrated from mongo to RDBMS you want to lock the data in the latter so that no-one accidentally updates the record in the RDBMS and not in Mongo? And therefore Mongo remains the definite source of truth?

nishantvyas 7y ago
basically locking will create the serializability for that document... so if there are concurrent updates on mongo side it will have to wait... also for step-1 in dual write it should be automic/two-phase between mongo and RDBMS.