1. A method implemented at least in part by a computer, the method comprising: receiving, at a first subtransaction that has a first seed, a second seed from a second subtransaction, the first and second subtransactions being part of a transaction that involves changes to database fragments associated with at least two logs, the first subtransaction being associated with a first log, the second subtransaction being associated with a second log; if the second seed is logically after the first seed, updating the first seed to be equal to or logically after the second seed; generating an identifier using the first seed, the identifier usable to order a data change relative to other data changes of the transaction; writing change information regarding the data change to a database fragment to the first log, the change information indicating any changes made via the data change; and associating the identifier with the change information.