Parallel process in Application engine

Question

could any one explain me what is parallel process in Application engine where temp table is use?
give me with example?

Answer 1

Parallel processing is used when considerable amounts of data must be updated or processed within a limited amount of time, or batch window. In most cases, parallel processing is more efficient in environments containing partitioned data.
To use parallel processing, partition the data between multiple concurrent runs of a program, each with its own dedicated version of a temporary table (for example, PS_MYAPPLTMP). If you have a payroll batch process, you could divide the employee data by last name. For example, employees with last names beginning with A through M get inserted into PS_MYAPPLTMP1; employees with last names beginning with N-Z get inserted into PS_MYAPPLTMP2.
To use two instances of the temporary table, you would define your program (say, MYAPPL) to access to one of two dedicated temporary tables. One execution would use A-M and the other N-Z.
The Application Engine program invokes logic to pick one of the available instances. After each program instance gets matched with an available temporary table instance, the %Table meta-SQL construct uses the corresponding temporary table instance. Run control parameters passed to each instance of the MYAPPL program enable it to identify which input rows belong to it, and each program instance inserts the rows from the source table into its assigned temporary table instance using %Table. The following diagram illustrates this process:
Multiple program instances running against multiple temporary table instances
There is no simple switch or check box that enables you to turn parallel processing on and off. To implement parallel processing, you must complete the following set of tasks. With each task, you must consider details regarding your specific implementation.
Define and save temporary table records in PeopleSoft Application Designer.
You don't need to run the SQL Build process at this point.
In PeopleSoft Application Engine, assign temporary tables to Application Engine programs, and set the instance counts dedicated for each program.
Employ the %Table meta-SQL construct so that PeopleSoft Application Engine can resolve table references to the assigned temporary table instance dynamically at runtime.
Set the number of total and online temporary table instances on the PeopleTools Options page.
Build temporary table records in PeopleSoft Application Designer by running the SQL Build process.