i have a couchdb with a database containing ~20M documents. it takes ~12h to build a single view.
i have saved 6 views successfully. they returned results quickly. at first.
after 2 days idle, i added another view. it took much longer to build, and it was a "nice-to-have", not a requirement, so i killed it after ~60% completion (restarted the windows service).
my other views now start re-building their indexes when accessed.
really frustrated.
additional info: disk had gotten within 65GB of full (1TB disk; local)