CockroachDB Serverless: Sub-second Scaling from Zero with Multi-region Cluster Virtualization. - Jeff Swenson; Andy Kimball; Raphael 'kena' Poss; Rebecca Taft; Jay Lim; Adam Storm; Sumeer Bhola; Paul Bulkley-Logston; Pj Tatlow; Rachael Harding; Rafi Shamim; Aditya Maru; et al. (SIGMOD Conference Companion, 2025)