Region 
A region is a specific synchronization mechanism used by the SAP MaxDB database system to synchronize exclusive task access to a critical section in the working memory.
Name |
Used for |
Description |
|---|---|---|
Region |
Data Cache |
EXCLUSIVE When a task accesses a critical section, the associated region blocks this critical section for all other tasks. |
Reader-writer lock (share lock) |
Catalog Cache Shared SQL Cache |
EXCLUSIVE or SHARED If a task write-accesses a critical section, the associated reader-writer lock (share lock) blocks this critical section for all other write-accesses but allows other read-accesses. If a task read-accesses a critical section, the associated reader-writer lock (share lock) blocks this critical section for all other write-accesses but allows other read-accesses. |
More Information
Concepts of the Database System, Working Memory Areas
Database Administration in CCMS, Critical Sections