Procedure documentationCritical Sections Locate this document in the navigation structure

 

In the Current Status user menu, you will find, among other things, a display of the accesses to the main memory structures.

Procedure

Open the Database Assistant (transaction DB50) or the liveCache Assistant (transaction LC10). Choose   Current Status   Critical Sections  .

or

Open the DBA Cockpit (transaction DBACOCKPIT) and select   Configuration   Critical Regions  .

Result

The system displays an overview of the accesses to the main memory structures that are only used exclusively: critical sections (so-called 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 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.

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

More Information

Database Console

DBA Cockpit: SAP MaxDB, Critical Sections