Out of memory problem using the API

Question

Hi all,
I need your assistance, we are working with CDB 10.2 making searches and retrieving the documents with all their attributes.
In our actual scenario we have a single user (which represents an application) accessing CDB. This user use several persistent sessions simultaneously. I mean, several thousands of final users connect to an application that uses one user of CDB to connect to CDB with several persistent sessions.
To simulate this scenario we wrote java code that open five threads and make several searches (requesting all the attributes) using the same user on cdb.
Retrieving a considerable amount of data found on the search (~5000), we found a “Out of memory” problem when we made these tests:
-     5 threads obtaining 100 documents (and all their attributes) / search
-     1 thread obtaining 500 documents (and all their attributes) / search
-     Also we have same problem if we make several searches with less results
We suppose it’s a configuration or code issue so we ask for your assistance and experience to solve it.
Thanks for your help,
Dani
import java.sql.Connection;
import oracle.ifs.examples.api.constants.AttributeRequests;
import oracle.ifs.examples.api.util.CommonUtils;
import oracle.ifs.fdk.Attributes;
import oracle.ifs.fdk.ClientUtils;
import oracle.ifs.fdk.FdkConstants;
import oracle.ifs.fdk.FdkCredential;
import oracle.ifs.fdk.ManagersFactory;
import oracle.ifs.fdk.NamedValue;
import oracle.ifs.fdk.Options;
import oracle.ifs.fdk.SearchExpression;
import oracle.ifs.fdk.SearchManager;
import oracle.ifs.fdk.SimpleFdkCredential;
import oracle.jdbc.pool.OracleDataSource;
public class Prueba {
     public static void main(String args[]) {
          Thread thread = new BasicThread1();
          Thread thread1 = new BasicThread1();
          Thread thread2 = new BasicThread1();
          Thread thread3 = new BasicThread1();
          Thread thread4 = new BasicThread1();
          thread.start();
          thread1.start();
          thread2.start();
          thread3.start();
          thread4.start();
class BasicThread1 extends Thread {
     public void run() {
          ManagersFactory session = null;
          try {
               System.out.println(this.getName() + "-->init");
               session = getSession();
               SearchManager sManager = session.getSearchManager();
               SearchExpression srchExpr = new SearchExpression(Attributes.SIZE,
                         new Integer(20000000), FdkConstants.OPERATOR_LESS_THAN);
               NamedValue[] res = null;
               for (int i = 0; i < 100000; i++) {
                    res = sManager.search(srchExpr, basicSearchOptions2,
                              AttributeRequests.DOCUMENT_CATEGORY_ATTRIBUTES);
               System.out.println(this.getName()+" --> fin sin error: " + res.length);
               } catch (Throwable t) {
t.printStackTrace();
System.out.println("<--"+this.getName());
          } finally {
               CommonUtils.bestEffortLogout(session);
     static NamedValue[] basicSearchOptions2 = new NamedValue[] {
               ClientUtils.newNamedValue(
                                   Options.MULTILEVEL_FOLDER_RESTRICTION,
                                   Boolean.TRUE),
               ClientUtils.newNamedValue(Options.SEARCH_FOR_DOCUMENTS,
                         Boolean.TRUE),
               ClientUtils.newNamedValue(Options.SEARCH_FOR_FOLDERS,
                         Boolean.FALSE),
               ClientUtils.newNamedValue(Options.RETURN_COUNT,
                         new Integer(500)) //<<Maximo nº de elementos
     private static ManagersFactory getSession() throws Exception {
     OracleDataSource ods = new OracleDataSource();
     ods.setURL("URL");
     Connection conn = ods.getConnection();
     FdkCredential credential = new SimpleFdkCredential("USER","PSW");
     ManagersFactory session = ManagersFactory.login(credential,
     "SERVER");
return session;
}

Answer 1

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