Hi, One more thought - when running similar tools on a live system, it's usually a good idea to limit the impact by throttling the throughput. As the verification runs in an independent process it can't reuse the vacuum-like cost limit directly, but perhaps it could do something similar? Like, limit the number of blocks read/second, or so?
regards -- Tomas Vondra http://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
