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According to http://drupal.org/node/443540:

Field storage modules could be written to store field data in a variety of ways including HyperTable, Amazon S3 or CouchDB

but I have no idea how to do

2 Answers2

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Despite the documentations, you could have a look on MongoDB module

http://drupal.org/project/mongodb

Haza
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Did you take a look at the Field Storage API documentation page? http://api.drupal.org/api/drupal/modules--field--field.attach.inc/group/field_storage/7

It's listing the hooks you need to implements to declare a new storage backend (hook_field_storage_info()) and to plug a field on a storage backend (hook_field_storage_OP()).

Artusamak
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