mailing list for the eXist opensource XML database

Wolfgang Meier | 1 Dec 2006 09:49

Re: XQuery (sandbox) and declare variable - err:XQST0049

> I'm trying to use variables in my XQuery:
>
> ---XQuery--BEGIN-----------------------------------------
>
> declare variable $foo as xs:integer := 7;
>
> //*
> ---XQuery--END-----------------------------------------
>
> But I get the following error: "org.exist.xquery.XPathException:
> err:XQST0049: It is a static error if more than one variable declared
> or imported by a module has the same expanded QName. Variable: foo
> [at line 1, column 40]"

This only happens with the sandbox. If you execute your query in the
Java admin client, all will be ok. The sandbox is itself written in
XQuery, so we are executing an XQuery from within an XQuery. This may
cause problems sometimes, especially with prolog expressions. I'll try
to fix this.

Wolfgang

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Pierrick Brihaye | 1 Dec 2006 09:56

Re: XQuery (sandbox) and declare variable - err:XQST0049

Hi,

Wolfgang Meier a écrit :

> This only happens with the sandbox. If you execute your query in the
> Java admin client, all will be ok. The sandbox is itself written in
> XQuery, so we are executing an XQuery from within an XQuery. This may
> cause problems sometimes, especially with prolog expressions. I'll try
> to fix this.

I've just started working on this  It looks like the cause is 
util:eval(), which reuses the outer context.

If that helps...

--

-- 
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Service régional de l'Inventaire / DRAC Bretagne
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Adam Retter | 1 Dec 2006 10:07

Re: Cursor like functionality

Sorry, I dont understand how what you are asking for below is any
different in functionality and memory requirements from what I have
suggested.

Thanks Adam.

On Thu, 2006-11-30 at 09:49 -0800, Hank Ratzesberger wrote:
> Yes, thanks, I considered this, but the potential result set 
> is megabytes.  
> 
> As it happens, these elements have a child with a unique ID,
> so I could cache the "ev-id" element and go back and get the 
> whole element one at a time //myNode[ev-id='an-id'] , but 
> there is some overhead to this also, even with an index.
> 
> So, without yet being familiar with the internals, I wonder 
> if the idea of persisting a query result for the life of a
> session, so that _start and _howmany work just like a cursor
> on subsequent calls -- if the idea has been discussed.
> 
> If the url escaped _query matches an existing, and an _start
> parameter is present, then, the persisted result set is 
> used with no need to re-evaluate the query.
> 
> Cheers,
> Hank
> 
> 
> ----- Original Message ----- 
> From: "Adam Retter" <adam.retter <at> devon.gov.uk>

(Continue reading)

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Wolfgang Meier | 1 Dec 2006 10:07

Re: Persist the cache?

> To deal with inital query performance as the cache gets populated I initally
> thought of running some queries at startup.
>
> Another alternative may be to persist the contents of the cache at shutdown
> and load the cache from the file (if it exists) at startup.  Does that make
> any sense?

Well, the cache just caches the pages from the btrees that live in the
.dbx files. Storing the entire cache into an additional file doesn't
make much sense. Instead, you could simply save the page numbers of
all pages in the cache, then refill the cache with those pages on
startup.

> If so, do you have any hints on where shutdown lives, how to reference the
> cache, and is the cache serializable?

Method BrokerPool.shutdown() is responsible for shutting down the db
(class BrokerPool represents the database instance). The class also
has a method

CacheManager getCacheManager();

CacheManager has a reference to all caches currently used by the .dbx
files (every .dbx file uses two caches, one for btree and one for data
pages). You thus need to extend CacheManager to iterate through all
caches and write out their page numbers.

Wolfgang

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Wolfgang Meier | 1 Dec 2006 10:15

Re: Cursor like functionality

> Yes, thanks, I considered this, but the potential result set
> is megabytes.

It depends: if the result set references nodes stored in the database,
eXist will just keep pointers to these nodes and memory consumption
will remain within bounds. However, if the result set contains XML
fragments that were constructed within the query, storing them in the
session might really not be a good idea.

Wolfgang

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Bertucci, Eve | 1 Dec 2006 10:28

need help for basic request in a collection !

Hello,

I have created a collection /db/nrssbycp and I have put some documents in it.

I don’t manage to do a request in it.

The structure of my documents is:
<nrss>
<channel>
<title>blabla</title>
</channel>
<nrss>

And my query is: collection(“/db/nrssbycp”)/nrss/channel/title
I tried to execute it from the graphical interface and from the shell and there is no answer. I also tried with fn:collection.

Please can somebody help me?

Thanks

Eve

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Oystein Reigem | 1 Dec 2006 10:54

Re: need help for basic request in a collection !

Eve,

Hello,

I have created a collection /db/nrssbycp and I have put some documents in it.

I don’t manage to do a request in it.

The structure of my documents is:
<nrss>
<channel>
<title>blabla</title>
</channel>
<nrss>

And my query is: collection(“/db/nrssbycp”)/nrss/channel/title
I tried to execute it from the graphical interface and from the shell and there is no answer. I also tried with fn:collection.

As the query is rendered in your mail the quotes are wrong. They should both be straight ". But I assume they were right when you tried the query, because else you would have got an error message.

(((And the end tag in the data should be </nrss>, not <nrss>.)))

Your query will fail if <nrss> is not the root element of your documents, or you put your documents in a subcollection of /db/nrssbycp.

- Øystein -

Please can somebody help me?

Thanks

Eve

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Pierrick Brihaye | 1 Dec 2006 13:15

Re: Trigger

Hi,

Frank Hölting a écrit :

> exeption:
> org.xmldb.api.base.XMLDBException: java.lang.NullPointerException
> 
> 	at org.exist.xmldb.RemoteCollection.store(RemoteCollection.java:501)

This is a client stack trace. It won't help up in getting the valuable 
information, which should be recorded in the server's logs.

Cheers,

--

-- 
Pierrick Brihaye, informaticien
Service régional de l'Inventaire / DRAC Bretagne
mailto:pierrick.brihaye <at> culture.gouv.fr / tél : +33 (0)2 99 29 67 78
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Bertucci, Eve | 1 Dec 2006 14:29

OutOfMemoryError when trying to launch client or shutdown

Hello,

I’ve had an outofmemory error when trying to delete a document from a collection.

Since then, I have the outofmemory when I try to launch the client or shutdown the server.

What should I do?

How can I avoid these errors (for the OutOfMemoryError when deleting the doc, I had –Xmx equals to 1 Go and inserting the same document had caused no problem)?

Thanks

Eve

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Leif-Jöran Olsson | 1 Dec 2006 15:36

Re: OutOfMemoryError when trying to launch client or shutdown


----- Ursprungligt meddelande -----

> How can I avoid these errors (for the OutOfMemoryError when deleting the
> doc, I had –Xmx equals to 1 Go and inserting the same document had
> caused no problem)?

You are a little sparse on details. In order to be able to help you we
need some more information. Minima are, how are you running this and how
are you doing the deletion? The interactive client has its own memory
settings if you for instance are using that in combination with a
server. Once you have gotten the exception you might be in a
irreversible state, which you only might be able to recover from with a
hard kill of the jvm process.

Cheers,
Leif-Jöran

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