[Xapian-tickets] [Xapian] #388: Allow lazy document deletion

[Xapian]

#388: Allow lazy document deletion
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 Reporter:  richard        |       Owner:  olly     
     Type:  defect         |      Status:  new      
 Priority:  normal         |   Milestone:           
Component:  Backend-Chert  |     Version:  SVN trunk
 Severity:  normal         |   Blockedby:           
 Platform:  All            |    Blocking:           
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 Currently, document deletion works by reading the termlist for the
 document, and updating the posting lists for each term immediately.
 Instead, we could keep a list of deleted document ids, and merge this list
 with the posting lists when iterating through them.  This would allow
 deletion to be performed even when the termlist table is not present.  The
 downside is that the statistics for the frequency of terms in the deleted
 documents would be incorrect.

 Xapian-compact should be updated to merge the list with the database (ie,
 to apply the deletions) - this could probably be done with little extra
 overhead, since xapian-compact already needs to read through the posting
 lists.

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Ticket URL: <http://trac.xapian.org/ticket/388>
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