The system table OMS_HEAP_STATISTICS describes the statuses of allocators used in SAP liveCache technology.
OMS_HEAP_STATISTICS
DESCRIPTION |
CHAR(40) |
Name of the allocator |
TOTAL_HEAP_USAGE |
FIXED(20) |
Currently used memory (bytes) |
MAXTOTAL_HEAP_USAGE |
FIXED(20) |
Maximum used memory (bytes) |
RESERVED |
FIXED(20) |
Memory managed by the allocator (bytes) |
ALLOC_CNT |
FIXED(20) |
Number of memory allocations |
FREE_CNT |
FIXED(20) |
Number of memory releases |
SYSTEM_ALLOC_CNT |
FIXED(20) |
Number of memory reservations in the base allocator |
SYSTEM_FREE_CNT |
FIXED(20) |
Number of memory releases in the base allocator |
TOTAL_SPINLOCKS |
FIXED(20) |
Number of attempts to get the spin lock |
COLLISIONS |
FIXED(20) |
Number of failed attempts to get the spin lock |
TOTAL_SPINLOOPS |
FIXED(10) |
Number of attempts to get the spin lock without prior release of the CPU |
TOTAL_YIELDLOOPS |
FIXED(10) |
Number of attempts to get the spin lock after prior release of the CPU |
MAX_SPINLOOPS |
FIXED(10) |
Maximum number of attempts to get the spin lock without prior release of the CPU |
MAX_YIELDLOOPS |
FIXED(10) |
Maximum number of attempts to get the spin lock after prior release of the CPU |
ERROR_CNT |
FIXED(10) |
Number of errors detected and automatically corrected by the allocator |
The OMS_HEAP_STATISTICS system table replaces the OMS_MEMORY_USAGE table, which should no longer be used.
See also:
Database Administration in CCMS: SAP liveCache Technology, Heap Usage, Memory