Critical Sections
In the Current
Status (OLTP /
liveCache) user
menu, you can, among other things, obtain a display of the accesses to the
main memory structures.
Procedure
1.
Open the Database
Assistant (transaction DB50) or the
liveCache
Assistant (transaction LC10).
2. Choose Current Status → Critical Regions.
...
Result
The system displays an overview of the accesses to the main memory structures that are only used exclusively: critical regions (“synchronization objects” or “regions” which are managed by special semaphores). 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 |
See also: