How To Fix CSM_VMC063 - Mittlere Häufigkeit der Full GCs aller Virtual Machines

SAP Error Message - Details

• Message type: E = Error

• Message class: CSM_VMC - Messages for VM Container Monitoring

• Message number: 063

• Message text: Mittlere Häufigkeit der Full GCs aller Virtual Machines

Was verursacht dieses Problem?

Each of the active virtual machines in the VM Container has reserved
memory for its Java heap. The size of this memory is bound to specified
limits when the VM is started and cannot be changed at runtime. Once
this memory is used up, the VM activates the garbage collection (GC)
procedure, in which memory allocated but no longer needed is freed up
again. There are two stages to this procedure - partial and full
garbage collection. The partial GC only cleans up dedicated memory areas
and therefore is much quicker than the full GC, and uses less resources.
This partial GC is performed more frequently and is part of normal
operation. The full GC is started when the permanent memory usage
(objects that have survived several partial GCs) exceeds specified
limits. The full GC clears all objects that are no longer needed in the
Java heap, reducing the memory usage to the lowest possible level. This
process involves a complex analysis of the Java object references and
takes a long time and uses up alot of VM resources.

Systemantwort

This monitor displays the average frequency of full GC runs in all
virtual machines in the VM Container. A frequency of several full GCs
per minute (10 and over) indicates that the VM memory is becoming low in
each of the active VMs, and this can affect system performance
considerably.
You can find more information in the online documentation under
<DS:KENO.001560AA0E081DEB91FE7CAB73A45918>Garbage Collection</>.

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