An event reporting system includes a computational component 228 operable (a) to receive notification of a change to an attribute of an entity, the entity, prior to the change, being associated with a first surrogate key, and (b) to defer the use of a second surrogate key for the entity until a selected...http://www.google.com.hk/patents/US7779042?utm_source=gb-gplus-share專利 US7779042 - Deferred control of surrogate key generation in a distributed processing architecture
