megadata

noun2

1. •
   Extremely large collections of electronically-stored data.

   • Experience with "megadata," large collections of remote objects presented to users, suggests that users typically view large collections of icons, but open only a few of them for detailed inspection. — 1995
2. •
   Large collections of personal data that are gathered and maintained by companies for commercial exploitation.

   • In nearly every case, each car and SUV and truck and bus was continuously signaling its position for the benefit of commercial collectors of megadata, police agencies—and whoever owned the future. — 2017