Hi Christian,

Thank you for your reply, you always help me.

- Can you share the query with us?. Yes, of course.

The query is pretty much the same that I've sent to Fabrice:

(# db:copynode false #) {
for $case in doc('file_A.xml')/trademark-applications-daily/application-information/file-segments/action-keys/case-file[case-file-header/status-code=(410,413,616,620,624,625,630,631,638,640,641,642,643,644,645,646,647,648,649,650,651,652,653,654,655,656,657,658,659,660,661,663,664,665,666,667,668,672,680,681,682,686,688,689,690,692,693,694,700,701,702,703,704,705,706,707,708,717,718,719,720,721,722,724,725,730,731,732,733,734,739,740,744,745,746,748,752,753,756,757,760,762,763,764,765,766,771,772,773,774,775,777,778,779,780,790,794,800,801,802,803,804,806,807,808,809,810,811,812,813,814,815,816,817,818,819,820,821,822,823,824,825,969,973)]
return insert node $case as last into doc("US")
}

And you're totally right about the security concerns: I don't offer to anyone the access to the RESTXQ endpoint, it's only for me but from another app ( on this case an Azure Web job instance ).

It's easy for me to do some maintenance tasks from a C# app, using the RESTXQ, instead of directly on some BaseX GUI.

At the beginning I tried to do this:

let $path:="A:\sources\xml\"

let $files:=
let $parts:=("US00","US01")
for $part in $parts
let $dir:= $path || $part
for $file in file:list($dir)
return $path || $part || "\" || $file

return
(# db:copynode false #) {
for $file in $files
for $case in doc($file)/trademark-applications-daily/application-information/file-segments/action-keys/case-file[case-file-header/status-code=(410,413,616,620,624,625,630,631,638,640,641,642,643,644,645,646,647,648,649,650,651,652,653,654,655,656,657,658,659,660,661,663,664,665,666,667,668,672,680,681,682,686,688,689,690,692,693,694,700,701,702,703,704,705,706,707,708,717,718,719,720,721,722,724,725,730,731,732,733,734,739,740,744,745,746,748,752,753,756,757,760,762,763,764,765,766,771,772,773,774,775,777,778,779,780,790,794,800,801,802,803,804,806,807,808,809,810,811,812,813,814,815,816,817,818,819,820,821,822,823,824,825,969,973)]
return insert node $case as last into doc("US")
}

And, of course, this ran out of memory in a matter of seconds. ( there are more than 100 files )

So, I thought:

- "Maybe, if I execute each of them using the RESTXQ the memory will be released after each execution..."

But seems I'm still missing something because the result is the same. But, at least, I can finish the process restarting the HTTP server when it fails.

I've uploaded two of the XML files in case you want to test something with them.[1]

Por supuesto que ayuda!

Regards,

Sebastian.

[1] https://easyupload.io/sd2ilu

On Fri, May 29, 2020 at 8:38 AM Christian Grün <christian.gruen@gmail.com> wrote:

Hi Sebastian,

In general, artifacts of updating queries should be cleaned up after
the execution.

The stack trace indicates that a very large main-memory database
instance was created by one of your queries that exceeded the memory
limits. Can you share the query with us?

As XQuery is more powerful than pure query languages, it may be risky
to allow the execution of arbitrary client code. First of all, you
should ensure that the code is run with limited user permissions;
otherwise, your system can be wiped out by a single file:delete('/',
true()) call. Next, you could try to limit memory usage and execution
time via the 'memory' and 'timeout' parameters [1]. However, as it’s
close to impossible to reliably control the memory consumption of
single threads in Java, I would rather suggest providing predefined
user queries.

Espero que esto ayude,
Christian

[1] https://docs.basex.org/wiki/XQuery_Module#xquery:eval

On Thu, May 28, 2020 at 8:39 PM Sebastian Guerrero <chapeti@gmail.com> wrote:
>
> Hi BaseX team!
>
> A quick question.
>
> Is there some known bug/common setting missing for RESTXQ and memory problems?
>
> I have this simple module ( into /webapp, a .xqm file ) :
>
>
> module namespace exe = 'http://site.com/execute';
> declare
> %updating
> %rest:path("update")
> %rest:consumes("application/x-www-form-urlencoded")
> %rest:POST function exe:update() {
>
> xquery:eval-update(request:parameter("query"))
>
> };
>
> I use it to execute some updates against some databases from different clients.
>
> Everything works fine by a while, but after some time I get this error [1]:
>
> java.lang.OutOfMemoryError: Java heap space
>
> I noticed that every call to update() the memory grows and grows until it reaches the OutOfMemoryError. [2]
>
> If I stop the HTTP server, the memory is released immediately. [3]
>
> What I'm doing wrong?
> Is there some command to execute the GC?
> Is this a problem with "xquery:eval-update()"?
> Am I using it in the wrong way?
>
> Best regards,
> Sebastian.
> [1] https://imgur.com/DrcbwQg
> [2] https://imgur.com/fonmrhm
> [3] https://imgur.com/SYFBFK8