cayenne-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "marco turchi" <marco.tur...@gmail.com>
Subject Re: out of memory
Date Tue, 06 Mar 2007 16:56:48 GMT
sorry, but I'm not an expert,  do you have an example?

On 3/6/07, Peter Schröder <Peter.Schroeder@freenet-ag.de> wrote:
> i experienced the same problem. i thinks this was because of using
>
> objectFromDataRow()
>
> which puts the object into the dataRow-cache and will result in out-of-memory errors.
>
> as a workaround i used the raw-object/data-row object from the query.
>
>
> -----Ursprüngliche Nachricht-----
> Von: marco turchi [mailto:marco.turchi@gmail.com]
> Gesendet: Dienstag, 6. März 2007 17:48
> An: user@cayenne.apache.org
> Betreff: out of memory
>
> Dear experts,
> I run a code, where I read 800.000 records from a database, but what I
> obtain is the error "out of memory: heap....".
> I use the following cayenne commands:
>
>         Expression exp_date = Expression.fromString("dateRetrieval >=
> $start_d and dateRetrieval < $end_d and type=$type");//("type=$type");
>         Map parameters =new HashMap();
>         parameters.put("end_d", "2006-03-09" );
>         parameters.put("start_d", "2005-10-07" );
>         parameters.put("type", "Job");
>         exp_date = exp_date.expWithParameters(parameters);
>         final SelectQuery feedsquery = new SelectQuery(FeedsAll.class,
> exp_date);
>         int count=0;
>         try{
>
>                 final ResultIterator it_q =  context.performIteratedQuery(feedsquery);
>                 while(it_q.hasNextRow()){
>
>                        final Map row = it_q.nextDataRow();
>                        final FeedsAll obj = (FeedsAll)
> context.objectFromDataRow(FeedsAll.class, new DataRow(row), true);
>                       .....
>                       context.deleteObject(obj);
>                  }
>         }
>         catch(Exception e){
>             //System.out.println("Fatal Error: "+e);
>             log.error("Fatal Error: ",e);
>             log.info(e.getStackTrace());
>         }
>
> what is it wrong? I understood that using the performIteratedQuery,  I
> could read a huge number of records without memory problem.
> Can you help me?
>
> Thanks a lot
> Marco
>

Mime
View raw message