
admin:bucket-assignment-policy() as element(db:assignment-policy)
This function returns an element that represents the bucket
  assignment policy. Use the 
  admin:database-set-assignment-policy
  
  function to set the assignment policy.
xquery version "1.0-ml";
import module namespace admin = "http://marklogic.com/xdmp/admin"
    at "/MarkLogic/admin.xqy";
let $config := admin:get-configuration()
let $dbid := admin:database-get-id($config, "db1")
let $policy := admin:bucket-assignment-policy()
return 
  admin:database-set-assignment-policy($config, $dbid, $policy)
  (: returns the new configuration element -- use admin:save-configuration
     to save the changes to the configuration or pass the configuration
     to other Admin API functions to make other changes.  :)
    
  
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