If there is a long queue of requests and you execute a request then the request needs to wait until the concurrent manager is free to process this request. Until then the request will be automatically kept in Pending stage.
If you need to execute the request urgently, what do you do? You will need to change the priority of the request for the concurrent manager to pick this request before the other requests.
Check this out. I had executed the standard concurrent program, Workflow Background Process. This request takes a minute to complete but it is in Pending stage as someone has executed multiple requests, EY DSR Invoice Validation and the concurrent manager will need time to pick up my request.
I fired the concurrent request from SRS form and I saw the request as below
On the menu I clicked on Tools > Manager and I found that the Concurrent Manager is executing 5 requests. There are 16 requests pending and my request is in the 14th position.