Concurrent Manager Overview

Concurrent Manager:

When a user runs a report, a request to run the report is generated. The command to run the report is a concurrent request.  The program that generates the report is a concurrent program. Concurrent programs are started by a concurrent manager.

Concurrent managers are fundamental to concurrent processing. A concurrent manger is an executable that is registered as a program library within Oracle Applications, and which runs in its own operating system process

Types of Concurrent Manager:

There are many pre-configured Concurrent Managers are there in Oracle E-business Suite. The most important managers are is as follows.

Internal Concurrent Manager (ICM):

ICM controls all other concurrent managers. It administers the startup and shutdown of managers as defined by their work shift, monitors for process failure, and cleans up if a failure occurs

Standard Manager:

Standard Manager as shipped with Oracle Applications will accept and run any concurrent requests, as it has no specialization rules that would restrict its activities.

Conflict Resolution Manager:

Conflict Resolution Manager enforces rules designed to ensure that incompatible concurrent requests do not run in the same conflict domain

Transaction Manager:

Transaction Managers support synchronous request processing, whereby a pool of server processes responds to requests from client programs. Instead of polling the concurrent requests table to obtain instructions, a transaction manager waits to be signaled by a client. An example is approval of an order, where execution of the request must take place quickly

Concurrent Manager - Tables

Table Content

FND_CONCURRENT_REQUESTS Details of user requests, including

status, start date, and completion

date

FND_CONCURRENT_PROGRAMS Details of concurrent programs,

including execution method, whether

the program is constrained, and

whether it must be run alone.

FND_CONCURRENT_PROCESSES Cross-references between

concurrent requests and queues,

and a history of concurrent manager

processes

FND_CONCURRENT_QUEUES Information about each of the

concurrent manager queues

Concurrent Request Life Cycle

Phase Activity

Pending / Normal The request is waiting to be run

Pending / Standby The request is waiting at CRM.

Running / Normal The request is running

Completed / Normal The request has finished

Inactive / No Manager The request cannot be run; No

manager available to process

There are many pre-configured Concurrent ManagersWhen a user runs a report, a request to run the report is generated. The command to run the report is a concurrent request.  The program that generates the report is a concurrent program. Concurrent programs are started by a concurrent manager.

Concurrent managers are fundamental to concurrent processing. A concurrent manger is an executable that is registered as a program library within Oracle Applications, and which runs in its own operating system process

Thanks 
Srini