Not only you cant use performance tuning since there are bugs if you use range paging:
http://adfbugs.blogspot.com/2009/07/performance-tuning-lovs-and-range.html
and Up to row number:
http://adfbugs.blogspot.com/2009/08/lov-view-object-tuning-only-up-to-row.html
but also because every time you open LOV and select a value it execute query many times.
To test that, i override the method executeQuery for collection and print the query:
@Override
protected void executeQueryForCollection(Object object, Object[] object2, int i) {
System.out.println("EmployeesLOV executes Query :" + this.getQuery());
super.executeQueryForCollection(object, object2, i);
}
when i open the lov and select a value i get the following log:
EmployeesLOV executes Query :Select * from Employees
30-Aug-2009 17:25:04 oracle.adfinternal.view.faces.renderkit.rich.RichRenderKit isNavigating
SEVERE: The original view root was not set.
EmployeesLOV executes Query :SELECT * FROM (Select * from Employees) QRSLT WHERE ( ( ( (EMPLOYEE_ID = :vc_temp_2 ) ) ) )
EmployeesLOV executes Query :Select * from Employees
so the LOV query is executed 3 times !?
If i type a value to fields that many LOV values start with this value then it is executed many times !!!.
EmployeesLOV executes Query :SELECT * FROM (Select * from Employees) QRSLT WHERE ( ( (EMPLOYEE_ID LIKE :vc_temp_2 ) ) )
30-Aug-2009 17:31:34 oracle.adfinternal.view.faces.renderkit.rich.RichRenderKit isNavigating
SEVERE: The original view root was not set.
EmployeesLOV executes Query :SELECT * FROM (Select * from Employees) QRSLT WHERE ( ( (EMPLOYEE_ID LIKE :vc_temp_2 ) ) )
EmployeesLOV executes Query :SELECT * FROM (Select * from Employees) QRSLT WHERE ( ( (EMPLOYEE_ID LIKE :vc_temp_2 ) ) )
EmployeesLOV executes Query :SELECT * FROM (Select * from Employees) QRSLT WHERE ( ( (EMPLOYEE_ID LIKE :vc_temp_2 ) ) )
EmployeesLOV executes Query :SELECT * FROM (Select * from Employees) QRSLT WHERE ( ( (EMPLOYEE_ID LIKE :vc_temp_2 ) ) )
EmployeesLOV executes Query :SELECT * FROM (Select * from Employees) QRSLT WHERE ( ( (EMPLOYEE_ID = :vc_temp_2 ) ) )
EmployeesLOV executes Query :Select * from Employees
Also while you scroll up and down in LOV the query is also executed many times.
Finaly if you type a value that many LOV values start with this value and scroll down then other values that dont start with this value are visible:
And if you select the value then you get a strange error:
Is this a bug?
Is there a way to use LOVs with a lot of data?
Test case:
http://adfbugs.googlecode.com/files/TestPerformance.zip
For the test case i put in Employees table about 100000 rows with the following procedure:
create or replace
PROCEDURE CREATE_EMPLOYEES AS
BEGIN
FOR i IN 1..100000 LOOP
Insert into employees (employee_id,
last_name,
email,
hire_date,
job_id)
select employees_seq.nextval as employee_id,
'auto' i as last_name,
'aut' i '@gmail.com' as email,
sysdate as hire_date,
'IT_PROG' as job_id
from dual;
END LOOP;
COMMIT;
END CREATE_EMPLOYEES;
