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Use

The Diagnosis user menu of the DBA Cockpit contains a display of the accesses to the main memory structures.

Procedure

Open the DBA Cockpit (transaction DBACOCKPIT) and choose Start of the navigation path Diagnosis Next navigation step Critical Sections End of the navigation path.

Caution

For SAP NetWeaver 7.1, you can access this information through the Critical Sections menu.

Result

The system displays an overview of the accesses to the main memory structures that are only used exclusively: Critical sections (synchronization objects, which are administered by special semaphores (also called regions)). You can see which thread (task) is accessing the corresponding main memory structure.

You can use these statistics to determine the cache activity and any resource conflicts that might exist. These conflicts can occur if a resource is requested more than once at a particular time.

If the number of conflicts is more than 10 % of all accesses, this indicates significant bottlenecks in your system.

Table 1: Explanation of the OMS Synchronization Objects

Synchronization object

Explanation

OMS2

Synchronization of the OMS heap

OMS3

Synchronization of the OMS monitor

OMS4

Synchronization of the unloading of versions

OMS5

Synchronization of the version directory

OMS6

Synchronization of the shared heap counter

OMS7

Synchronization of the stack heap counter

OMS8-OMS<n>

User-defined synchronization objects

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