Start Process of the SAP System

By | 06/03/2012

 

Start Process of the SAP System
 Start Process of the SAP System is performed in multiple steps and it is done my SAP Administrator user <sid>adm.
Step 1.        Start database
          The core of the entire SAP system is its database.   So the database is started first.
 
Step 2.        Start Central Service Instance (CSI)
Start the Central Service Instance that contains both enqueue and message service for the Java part of SAP. The central Services are installed as an independent instance.
 
Step 3.        Start central Instance.
After the start of database and CSI next, we see that is operating system collector SAPOSCOL is active or not. If not already active then we start it.
It’s a program that runs on an operating system in background independent of SAP instances. It collects data about operating system resources and makes it available through shared memory of all SAP instances.

The operating system collector SAPOSCOL is a stand-alone program that runs in the operating system background. It runs independently of SAP instances exactly once per monitored host. It collects data about operating system resources, including:

  • Usage of virtual and physical memory
  • CPU utilization
  • Utilization of physical disks and file systems
  • Resource usage of running processes

It makes the data available using a segment of the shared memory for various applications and all SAP instances on a host. A CCMS agent or a dialog work process reads the data from the shared memory. You can display the data in various monitoring architecture monitors or in the operating system monitor (transactions OS07 and ST06). If the operating system data is read and sent by CCMS agents, you can display operating system data for any hosts in a central system.

The Central Instance with its message server, dispatcher and work processes are started.
 
Step 4.        Start Dialog Instance
If we don’t have dialog instance running on the same host as the central instance, then SAPOSCOL is started (if not running), then dispatcher along with its work process is started.

 

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