Software foundations for data interoperability and large scale graph data analytics : 4th international workshop SFDI 2020 and 2nd international workshop LSGDA 2020 held in conjunction with VLDB 2020 Tokyo Japan September 4 2020 : proceedings This book constitutes refereed proceedings of the 4th International Workshop on Software Foundations for Data Interoperability SFDI 2020 and 2nd International Workshop on Large Scale Graph Data Analytics LSGDA 2020 held in Conjunction with VLDB 2020 in September 2020. Due to the COVID 19 pandemic the conference was held online. The 11 full papers and 4 short papers were thoroughly reviewed and selected from 38 submissions. The volme presents original research and application papers on the development of novel graph analytics models scalable graph analytics techniques and systems data integration and data exchange