I need to delete all of the documents in a collection in Marklogic. The
database in which we have the documents stored has over 4.4 million
documents. The collection itself has approximately 1.7 million documents.
We
are currently running 4.0-4 of MarkLogic. We will be upgrading in the near
future to 4.2, but that does not help us with this problem.
I have attempted to use the code below to perform the delete, but I am only
able
to delete 5 documents per second using this method.
(: Delete documents in a collection :)
xquery version "1.0-ml";
let $assert :=
if (xdmp:request-timestamp()) then ()
else
error((), 'NOTIMESTAMP', text { 'outer query is not read-only' })
let $path := '/documents/7615990080550346622/'
let $map := map:map()
let $list-uris :=
for $i in xdmp:directory($path, 'infinity')[1 to 10000]
return map:put($map, xdmp:node-uri($i), true())
let $do := xdmp:eval('
declare variable $URIS as map:map external;
xdmp:document-delete(map:keys($URIS))
',
(xs:QName('URIS'), $map),
<options xmlns="xdmp:eval">
<isolation>different-transaction</isolation>
<prevent-deadlocks>true</prevent-deadlocks>
</options>
)
return count(map:keys($map))
I read another post on this mailing list that indicated that if you set
directory creation to "manual" and did not have any triggers enabled in the
database, that doing a directory delete would be extremely fast. However, we
DO
have CPF enabled (and cannot disable it) and cannot set directory creation to
manual since we depend on the automatic directory creation in our application.
Any suggestions as to how we can get better throughput for deleting all of the
documents in a collection OR deleting a large number of documents from a large
database? Clearing a collection as quickly as possible while retaining the
collection itself is the goal at this time.
Thanks,
Allen Shatzer
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