Many services will continue to use legacy or COTS systems that incorporate their own databases [and] heterogeneity of service unit implementation technologies is fundamental to SOA agility.
In the study of plane heterogeneity, the homogeneity in (1 + 2) 4 (1) depositional unit was the best, while the homogeneity of 42 (2) depositional unit was the worst in upper ng of Chengdao Oilfield.