To set up the Work Queue Manager, you must activate it and add schedules for PSA classes that do not have a custom scheduling page.
To activate the Work Queue Manager:
From Setup, click Develop | Custom Settings | WorkQueues.
Select the Use Work Queue Manager and Use Work Queue Monitor checkboxes.
Select or deselect the different categories of Apex jobs that you want to include or exclude from processing by Work Queue Manager.
Adding Schedules for PSA Classes with no Custom Scheduling Page
To add schedules for the PSA classes that do not have a custom scheduling page:
Click the Work Queues tab.
Click New.
Select the Apex Class that you are adding the schedule for.
Enter the frequency of the schedule.For instance:
If you want to schedule the event to occur on a Wednesday when that day falls within the first ten days of the month, select Weekly, Wednesday and checkboxes 1 to 10.
If you want the event to occur on the last Wednesday of the month, select Monthly and On the Last Wednesday.
If you want the event to occur on the second last day of the month, select Weekly, Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and L-1.
Click Save.
Repeat these steps for the remaining Apex Classes.