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   1  --
   2  -- Change the index on user_name to a unique index to prevent
   3  -- duplicate registrations from creeping in.
   4  --
   5  -- Run maintenance/userDupes.php or through the updater first
   6  -- to clean up any prior duplicate accounts.
   7  --
   8  -- Added 2005-06-05
   9  --
  10  
  11       ALTER TABLE /*$wgDBprefix*/user
  12        DROP INDEX user_name,
  13  ADD UNIQUE INDEX user_name(user_name);