Abstract: A method of replicating changes to a dataset includes receiving from a client a request for an operation on the dataset, dynamically selecting from a plurality of replication assurance policies a selected replication assurance policy for the operation, the selected replication assurance policy determining a selected assurance level, wherein the selection is based on at least one of an operation criteria or a connection criteria, submitting, to a first replica of the dataset, a command comprising the operation, and reporting to the client the result of the operation according to the selected assurance level.

Abstract: Various embodiments of methods and apparatus for detecting a change in an orientation of a portion of a structure. In some embodiments, the apparatus includes a processor, an energy storage unit, a location reporting unit, a wireless communication module and one or more inclination sensors. In some embodiments, each of the one or more inclination sensors is configured to measure inclination by measuring an orientation of the each of the one or more inclination sensors relative to a gravitational acceleration vector.