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From Tim Tisdall <>
Subject Re: dropping revision records
Date Fri, 07 Sep 2012 00:51:14 GMT
Okay.  I think I saw somewhere that the default was 1000.  I had only
about 6 revisions on each doc so changing it even to something as low
as 10 wouldn't help at all, correct?


On Thu, Sep 6, 2012 at 7:41 PM, Paul Davis <> wrote:
> Its a PUT to /dbname/_revs_limit IIRC. Not sure if there's a wiki page or not.
> Also, it limits the number of _revisions per leaf in a revision tree.
> There's a lot of subtlety in there so you'll definitely want to fully
> understand revision trees and conflict resolution before you start
> going too small on that.
> On Thu, Sep 6, 2012 at 4:30 PM, Tim Tisdall <> wrote:
>> Are there docs in the wiki on how _rev_limit works?  I tried looking
>> for documentation with Google, but couldn't find any.  Where exactly
>> is that set, and does that affect the total number of revisions across
>> the database or the total per document?
>> On Thu, Sep 6, 2012 at 4:35 PM, Robert Newson <> wrote:
>>> I think Tim was clear that this was post-compaction, though. The 2gb is the historic
_rev values for all these documents.
>>> You could lower _rev_limit and recompact to flush these out.
>>> B.
>>> On 6 Sep 2012, at 20:46, Benoit Chesneau wrote:
>>>> On Thu, Sep 6, 2012 at 4:18 PM, Tim Tisdall <> wrote:
>>>>> I had a database of about 10.8gb with almost 15 million records which
>>>>> was fully compacted.  I had to back it up by dumping all the JSON and
>>>>> then restoring it by inserting it back in.  After it was done and I
>>>>> compacted it the database was now only 8.8gb!  I shed 2gb because of
>>>>> dropping the revision stubs still in the database.  This is likely
>>>>> because each record had about 6 revisions (so around 90 million
>>>>> stubs).  All of this is understandable, but 2gb isn't really
>>>>> negligible when running on a virtualized instance of 35gb.  The
>>>>> problem, though, is the method I used to dump to JSON and place it
>>>>> back into couchdb took almost 12hrs!
>>>>> Is there a way to drop all of the revision stubs and reset the
>>>>> document's revision tags back to "1-" values?  I know this would
>>>>> completely break any kind of replication, but in this instance I am
>>>>> not doing any.
>>>> It would break more than the replication. Compacting your database is
>>>> the solution.
>>>> - benoƮt

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