Interactive & Batch job

[kevin_07]

Hi,

can anyone xplain the Difference between Interactive Job and Batch job w.r.t performance.
Thanks in advance

Rgds,
Kevin.

[DeadManWalks]

Re: Interactive & Batch job

Run long running process in batch or have users complain that the system is running like an old dog.

[abhishek_ec002]

Re: Interactive & Batch job

Interactive job is started by the user and basically wait for user input. When user enters data then program takes some action. The user's speed largely determines the rate at which work is accomplished but Batch jobs process a large chunk of data all at once and are non-interactive in terms of user input. Hence i think it is useless to compare both the entities as both of them plays entirely different role.

[DeadManWalks]

Re: Interactive & Batch job

True that, unless he/she wants to know the difference in running a process interactively or in batch.

I don't know if batch does better and record blocking or not.

I have only noticed a performance difference when running a query. most* of the time running in batch runs faster then running the same query interactively.

[MikeS]

Re: Interactive & Batch job

For the most part, running the same program in batch is quicker than running interactively.

I may be wrong, but the iSeries (As/400) was always optimised for batch running.

[arrow483]

Re: Interactive & Batch job

I have only noticed a performance difference when running a query. most* of the time running in batch runs faster then running the same query interactively.

Actually, when interactive it is optimized for returning the first rows as fast as possible. When run in batch, its optimized for returning the entire result set as fast as possible.

But batch performance is also dependent on system resources. Batch usually runs at a lower priority than interactive, so if system resources are constrained, it might run slower.

[kitvb1]

Re: Interactive & Batch job

It also depends on the machine that you've got. Some models are designed to be more a server than a user machine.

Also, apparently IBM instituted limits on certain resource usage. One of them being CPU speed. I do believe there was a court case about this in the past 2 years and I believe the ruling was that they are no longer allowed to restrict the CPU speed.