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