There's probably nothing worse than not being able to start your SAP system … Especially the production system! Aside from the operating system and the database server you must pay close attention to certain places in SAP to find out what caused the problem and how to solve it. Here are the two places you will definitely need to check: EventViewer (Application and System logs) and the SAP Management Console (MMC).
EventViewer can provide useful information and it may help you pinpoint where the problem resides. The SAP MMC gives you the ability to visually see the system status (green, yellow or red lights), view the work processes status and view the developer traces, which are stored in the "work" directory. Example: /usr/sap/TST/DVEBMGS00/work.
For a central SAP instance to start successfully, both the message server and the dispatcher need to start. If one of them or both fail to start, users cannot log in to the system. The following scenarios will illustrate possible causes of why an SAP instance might not start and the reason of the message:
"*** DISPATCHER EMERGENCY SHUTDOWN ***".
Things you need to get familiar with:
- Developer Traces:
-- dev_disp Dispatcher developer trace
-- dev_ms Message Server developer trace
-- dev_wp0 Work process 0 developer trace - The "services" file, which contains TCP and UDP services and their respective port numbers. This plain-text configuration file is located under %winnt%/system32/drivers/etc.
- Windows Task Manager (TASKMGR.exe).
- Dispatcher Monitor (DPMON.exe), which is located under /usr/sap/
/sys/exe/run. - Database logs.
- EventViewer (EVENTVWR.exe).
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