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From Chris Ashton <>
Subject Re: Corrupt database file
Date Fri, 21 Mar 2014 13:53:22 GMT
Thanks Ken

Unfortunately, I don't know much. We have a desktop application which uses CouchDB as its
back end. Once the developer left, no-one knew how to run it and (of course) last week, it
stopped responding.

My best guess as to how it happened is the server ran out of disk space but I can't confirm
that as I didn't see the server immediately, it was messed with by our hardware providers.
We had not run any compacts or anything through ignorance and it grew very large indeed!



 From: "Knudsen, Ken" <>
To: "" <>; Chris Ashton <>;
Tim Tisdall <> 
Sent: Friday, 21 March 2014, 13:49
Subject: RE: Corrupt database file

Sorry that I can't help with your exact circumstance (I'm new as well)...but is there any
additional information you could provide so far as a use-case as to how this happened? My
current readings and understandings with couchDB is that something like this shouldn't happen
at all....So I find this very interesting...(in a sad way)....



-----Original Message-----
From: Chris Ashton [] 
Sent: March-21-14 9:35 AM
To: Tim Tisdall;
Subject: Re: Corrupt database file

Hi Tim

Many thanks for this reply. I have tried this dump method but even that fails, complaining
about the database file : "curl: (56) Problem (2) in the Chunked-Encoded data"

Our files are huge so everything takes ages.

The only other thought I have right now is to process this enormous text file, add whatever
curly braces and the like are required to turn it back into valid JSON and then, as you suggest,
rewrite it into the database in some way.

I'm just surprised there is no utility to fix bad data sections, it's a real pity.

By the way, I probably should have mentioned, we appear to have couchbase single version 1.2.0

Thanks again


From: Tim Tisdall <>
To:; Chris Ashton <> 
Sent: Friday, 21 March 2014, 13:19
Subject: Re: Corrupt database file

I don't think there's any tool for fixing corrupted db files...  What I'd try doing is dumping
all the content from the DB and reconstructing it.  You can fetch everything in the database
by downloading (where the IP
and domain is your server, and 'my_database' is your DB).  You'd then need to write some
sort of script to read that JSON document and then write the values back into a _new_ database.

Does anyone know if there's a way to do this same sort of thing with replication?  (I have
to do it the other way because I don't have enough space for 2 copies of my DB on my system)

On 21 March 2014 07:46, Chris Ashton <> wrote:

>I am a novice with CouchDB and really struggling to support a product that someone developed
before leaving the company. No one else has any skills in Couch so I'm trying to pick up the
>Our database has stopped responding and we've tried compacting but to no avail.
>We are getting errors like the following in the log file, which I presume mean that we
have a corrupt db file for one reason or another:
>[Fri, 21 Mar 2014 10:06:56 GMT] [error] [<0.213.0>] ** Generic server <0.213.0>
>** Last message in was {'EXIT',<0.217.0>,
>                               {file_corruption,<<"file
>I was wondering if there was a utility which would scan DB files and remove badly formed
parts or anything like that? We are running on Windows.
>Many thanks

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