Problem in accessing huge data resultset

Question

HI,
Am generating a weekly report in my code. My sql queries(query1 =18495 and query2=532000) results in 5.5 lacs of records. Given below is my code. Am using Jboss-4.2.x running on solaris 10. Oracle 9i is my backend DB . Using the driver version of Oracle JDBC Driver version - 9.0.2.0.0 with connection pool.
Below code was running successfully for long time but all of sudden it stopped working without any exception or error. The query 1 is getting executed successfully but while accessing the resultset its getting hanged without any exception even for 3 - 4 days. In my log am getting this message ""========SQL query1 execution completed ======" after that no exception or error. Query1 always constantly result in 18495 records only, here there is no dynamic data to the query. But in the query2 the date will be changed to the current date of the report day. The problem is the processing of resultset for query1 itself is got hanged.
Any one knows any other way to access this huge resultset in more effective way without failure.
Thanks in advance
Karthi

Answer 1

ArrayList reportList = new ArrayList();
     buffer.append("SELECT SR.DEVICE_CONTACT , TO_CHAR(SR.PROVISION_DATE,'mm/dd/yyyy HH24:mi:ss') , ")
          .append("(SELECT CD.CODE FROM CODE CD WHERE CD.CODE_ID = SR.SUBSCRIBER_STATUS) , TO_CHAR(UP.STATUS_EFFECTIVE_DATE,'mm/dd/yyyy HH24:mi:ss') , ")
          .append("SR.DEVICE_TYPE, DECODE(SR.MAKE_MODEL_UPDATE,1,'Y','N') , (SELECT UDI.OS_VERSION FROM USER_DEVICE_INFORMATION UDI WHERE SR.SUBSCRIBER_ID = UDI.USER_ID) ,")
          .append("(SELECT TO_CHAR(max(MD.LAST_MODIFIED_DATE),'mm/dd/yyyy HH24:mi:ss') FROM MENU_DOWNLOAD MD WHERE SR.DEVICE_CONTACT=MD.DEVICE_CONTACT) ")
          .append("FROM SUBSCRIBER_REGISTRATION SR, USER_PROFILE UP WHERE SR.SUBSCRIBER_ID = UP.EXTERNAL_USER_ID AND (SR.PROVISION_DATE <= TO_DATE('10/26/2007 23:00:00','MM/dd/yyyy HH24:mi:ss'))");
preparedStatement = connection.prepareStatement(buffer.toString(),ResultSet.TYPE_FORWARD_ONLY,ResultSet.CONCUR_READ_ONLY );
     //preparedStatement.setFetchSize(1000);
     rs = preparedStatement.executeQuery();
     Logger.log(ServerLogger.SEVERITY_DEBUG,THIS_CLASS,THIS_METHOD,
"========SQL query1 execution completed ======"+System.currentTimeMillis());
//rs.setFetchSize(100);
rs.setFetchSize(500);
     while (rs.next())
     ReportBean reportBean = new ReportBean();
     reportBean .setMdn(rs.getString(1));
     reportBean .setActivationDate(rs.getString(2));
     reportBean .setSubscriberStatus(rs.getString(3));
     reportBean .setLastUpdatedDateofStatus(rs.getString(4));
     reportBean .setDeviceType(rs.getString(5));
     reportBean .setPhoneChangeFlag(rs.getString(6));
     reportBean .setDeviceOS(rs.getString(7));
     reportBean .setLastActivityDate(rs.getString(8));
     reportList.add(reportBean);
     rs.close();
     closeStatement(preparedStatement);
     //query 2 block execution started
     buffer= new StringBuffer();
     buffer.append("SELECT SR.DEVICE_CONTACT , ")
.append("TO_CHAR(SR.PROVISION_DATE,'mm/dd/yyyy HH24:mi:ss') , ")
.append("(SELECT CD.CODE FROM CODE CD WHERE CD.CODE_ID = SR.SUBSCRIBER_STATUS) , ")
.append("TO_CHAR(UP.STATUS_EFFECTIVE_DATE,'mm/dd/yyyy HH24:mi:ss') , ")
.append("SR.DEVICE_TYPE, DECODE(SR.MAKE_MODEL_UPDATE,1,'Y','N') , ")
.append("(SELECT UDI.OS_VERSION FROM USER_DEVICE_INFORMATION UDI WHERE UP.USER_ID = UDI.USER_ID) ,")
.append("(SELECT TO_CHAR(MD.LAST_MODIFIED_DATE,'mm/dd/yyyy HH24:mi:ss') FROM MENU_DOWNLOAD MD ")
.append("WHERE UP.USER_ID=MD.USER_ID) FROM SUBSCRIBER_REGISTRATION SR,USER_PROFILE UP ")
.append("WHERE SR.SUBSCRIBER_ID = UP.EXTERNAL_USER_ID AND SR.PROVISION_DATE >TO_DATE('10/26/2007 23:00:00','MM/dd/yyyy HH24:mi:ss')")
.append("AND (SR.REQUEST_TIME <= TO_DATE('03/22/2009 00:01:00','MM/dd/yyyy HH24:mi:ss'))");
     preparedStatement = connection.prepareStatement(buffer.toString(),ResultSet.TYPE_FORWARD_ONLY,ResultSet.CONCUR_READ_ONLY );
     rs = preparedStatement.executeQuery();
     revoLogger.log(ServerLogger.SEVERITY_DEBUG,THIS_CLASS,THIS_METHOD,
"========SQL query2 execution completed ======"+System.currentTimeMillis());
//rs.setFetchSize(100);
     rs.setFetchSize(500);
     while (rs.next())
     ReportBean reportBean = new ReportBean();
reportBean .setMdn(rs.getString(1));
reportBean .setActivationDate(rs.getString(2));
reportBean .setSubscriberStatus(rs.getString(3));
reportBean .setLastUpdatedDateofStatus(rs.getString(4));
reportBean .setDeviceType(rs.getString(5));
reportBean .setPhoneChangeFlag(rs.getString(6));
reportBean .setDeviceOS(rs.getString(7));
reportBean .setLastActivityDate(rs.getString(8));
reportList.add(reportBean );
     rs.close();