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https://issues.apache.org/jira/browse/COUCHDB-61?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659455#action_12659455
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Jan Lehnardt commented on COUCHDB-61:
-------------------------------------

Damien via dev@

"What you are proposing is grouping the document data together for better OS 
caching performance, but CouchDB already does that. Documents bodies are 
written to contiguous regions, one after another, the attachments are stored in 
separate locations in the file.

-Damien
"

— this is what I meant with my previous comment :)

> Separate storage of attachments from the main database file
> -----------------------------------------------------------
>
>                 Key: COUCHDB-61
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-61
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: Database Core
>         Environment: All
>            Reporter: Jan Lehnardt
>            Priority: Minor
>
> At the moment all document- and attachment-data go into the same database 
> file. It would be nice if the attachments could be saved in a different file. 
> This would enable the use of slower and cheaper hardware for attachment 
> storage and faster hardware for the document and index data storage.

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