#4356 NORM First D: need a fast way to extract all existing ids in the datastore

[Zarro Boogs per Child]

#4356: need a fast way to extract all existing ids in the datastore
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 Reporter:  tomeu        |       Owner:  bcsaller              
     Type:  enhancement  |      Status:  new                   
 Priority:  normal       |   Milestone:  First Deployment, V1.0
Component:  datastore    |     Version:                        
 Keywords:               |    Verified:  0                     
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 For restoring a laptop to the state where it was at the last backup, we
 need to send to the school server a file with all the ids that are
 currently present in the DS.

 This cannot be done using the usual ways (find()), as we are still very
 far from being able to retrieve one thousand elements from xapian in a
 reasonable amount of time.

 If nothing inside xapian can be done for performing this operation in a
 maximum of 1s., we'll need to do it from outside.

 The possibility we are thinking of right now is maintaining a external
 file with the ids, logging every insert and every delete.

 Ben, can you suggest a better solution? Would you be able to implement
 this during the following week (21-27/10) or should I give it a try?

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Ticket URL: <https://dev.laptop.org/ticket/4356>
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