MarkLogic: Simple Example of a bulk delete of documents from a URI query

spawn-bulk-delete.xqy

xquery version "1.0-ml";

declare variable $TARGET-DIRECTORY as xs:string := "/"; 
declare variable $TARGET-DATABASE as xs:string := "YourDatabaseName";
declare variable $BATCH-SIZE as xs:integer := 20000;

for $uri in cts:uris("", ("document", "limit="||$BATCH-SIZE), cts:directory-query($TARGET-DIRECTORY))
return 
xdmp:eval(
  "declare variable $URI as xs:string external;
  xdmp:document-delete($URI)",  
  (xs:QName("URI"), $uri),
  <options xmlns="xdmp:eval">
    <isolation>different-transaction</isolation>
    <prevent-deadlocks>true</prevent-deadlocks>
    <database>{xdmp:database($TARGET-DATABASE)}</database>
  </options>)