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From "Matt Goodall (JIRA)" <>
Subject [jira] Created: (COUCHDB-529) Avoiding updating a doc's _rev if nothing changed
Date Thu, 15 Oct 2009 15:38:31 GMT
Avoiding updating a doc's _rev if nothing changed

                 Key: COUCHDB-529
             Project: CouchDB
          Issue Type: New Feature
          Components: Database Core
            Reporter: Matt Goodall

Would it be possible for CouchDB to use its deterministic rev algorithm to avoid writing changes
to the database if nothing has actually changed in the doc that is sent for update.

The most obvious use case is the user who clicks an HTML form's submit button, instead of
using the back button, when they haven't changed anything. I suspect most applications do
not check if the user made any changes and therefore end up sending exactly the same data
back as an update ... unnecessarily creating a new document rev, growing the database, invalidating
views, triggering _changes updates, etc.

If CouchDB could determine that the new document is the same as the old document then it could
avoid writing to disc and return the current _rev in the response.

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