-dain
Gene Ge wrote:
iterator extremely slow problem
Because I found my search was very slow, so I made a simple test:
code:*************************************************************************************
......
System.out.println("====before findAll. time is"+new Date().getTime());
Iterator graduates=graduateHome.findAll().iterator();
System.out.println("====after findAll. time is"+new Date().getTime()+" size="+graduateHome.findAll().size());
long interval=0;
long oldtime=0;
System.out.println("====begin while. time is"+new Date().getTime());
while(graduates.hasNext()){
graduate=(GraduateLocal) graduates.next();
interval=new Date().getTime()-oldtime;
oldtime=new Date().getTime();
System.out.println("====in while. interval is"+interval);
System.out.println("====graduate is "+graduate.getStudent().getName());
}
System.out.println("====after while. time is"+new Date().getTime());
code end******************************************************************************
the output is:************************************************************************
18:12:43,625 INFO [STDOUT] ====before findAll. time is1036577563625
18:12:44,406 INFO [STDOUT] ====after findAll. time is1036577563968 size=1804
18:12:44,421 INFO [STDOUT] ====begin while. time is1036577564421
18:12:44,421 INFO [STDOUT] ====in while. interval is1036577564421
18:12:50,562 INFO [STDOUT] ====graduate is ���
18:12:50,562 INFO [STDOUT] ====in while. interval is6141
18:12:56,343 INFO [STDOUT] ====graduate is �� ��
18:12:56,343 INFO [STDOUT] ====in while. interval is5781
18:13:02,484 INFO [STDOUT] ====graduate is ������
18:13:02,484 INFO [STDOUT] ====in while. interval is6141
18:13:08,328 INFO [STDOUT] ====graduate is �� ά
18:13:08,328 INFO [STDOUT] ====in while. interval is5844
18:13:14,437 INFO [STDOUT] ====graduate is ���
18:13:14,437 INFO [STDOUT] ====in while. interval is6109
18:13:20,171 INFO [STDOUT] ====graduate is �� ��
18:13:20,171 INFO [STDOUT] ====in while. interval is5734
18:13:26,187 INFO [STDOUT] ====graduate is �� ��
18:13:26,218 INFO [STDOUT] ====in while. interval is6047
18:13:32,000 INFO [STDOUT] ====graduate is �� ��
18:13:32,015 INFO [STDOUT] ====in while. interval is5797
18:13:37,687 INFO [STDOUT] ====graduate is �� ��
18:13:37,703 INFO [STDOUT] ====in while. interval is5688
......
...
******************************************************************************************
Graduate is a CMP Bean with 5 attributes and 5 CMRs map table includes about 18000 rows use Microsoft SQLServer JDBC Driver. Connection properties has "selectMethod=cursor".
the CMT type is "Supports"
this test is invoked in a struts Action without any transaction.
So, how can I deal with it?
any help is appreciated.
Gene
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Chief Architect JBossCMP
JBoss Group, LLC
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