Volume 2 is abstract only papers from the 2019 ICDE World Conference on Online which attracted over 800 delegates from more than 80 countries. The World Conference papers are spread across two volumes, with Full Papers appearing in the first volume. All the papers in Volume 1 have undergone an extensive peer review process involving: (i) a review of original abstract proposals, (ii) a review of paper submissions before the conference, and (iii) a post conference review. Not all submitted papers passed through the review process, with in some cases the work appearing under another paper category, which you will find in this Volume 2.