I would like to purge a few (~100 million) documents from my database. I've 
been going through deleting them all, and that'll be complete in the next few 
days but I would like to free up some extra space by purging them also.

My concern is around a comment on the wiki page here 
http://wiki.apache.org/couchdb/Purge_Documents

'If you have purged more than one document between querying your views, you 
will find that they will rebuild from scratch.'

Since I have already deleted the documents I know they aren't showing up in the 
view any longer. Is there any way I can avoid this view invalidation? (My views 
take about 10 days to build from scratch so I can't afford the hit).

I have a replica of the database. I could do the purge on the replica, wait for 
the view to rebuild, switch over, purge on the original db, wait for the view, 
switch back, unless there are any obvious problems with this approach?

Cheers,
Paul

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