System heap value in LC10

Question

Hi,
This is related to LC 7.5 on AIX.
I go to LC10 - LiveCache Monitoring - Current Status - Memory Areas - Heap Usage.
On the right side in "Currect value" section there is a "System Heap". How does this value gets assigned. I was in impression that "System Heap" value and OMS_HEAP_LIMIT are same but it does not seem to be same.
What is the impact of "System Heap" and how can we increase it. In production it is 30% higher than OMS_HEAP_LIMIT. In test box it is same.
Please let me know if anybody has a good understanding about this issue.
Thank you.
Sume

Answer 1

1) "What is dimensions of data cache and how it can be increased.
Does it mean that increase the data cache. I know how to increase
the data cache."
-> As I wrote that you could increase the value of the CACHE_SIZE
   < Size of the I/O buffer cache in pages > liveCache parameter.
   As you know, the primary consumers of the main memory managed in
   the I/O cache are the converter and the data cache.
You could monitor the data cache usage in LC10 -> liveCache:Monitoring
-> Choose Current Status -> Memory Areas -> Caches.
=> you will see the current size values in KB & pages for
   I/O Buffer Cache 
      Data-Cache    -> current size of data cache !!
      Converter 
      Sonstiges
    Catalog-Cache 
    Sequence-Cache
   && current data cache usage information ... 
You could review the DBAN_OMS_CACHE_OCCUPANCY.csv file of the DB Analyzer
Statistics information.
Please check the Permanently Used Area of the Data Area in liveCache,
review the statistics in DBAN_FILLING.csv file, if the DB Analyzer is
Running. In case the applications are using all data created in liveCache,
For the best performance the data need to be cashed => you will define
the dimensions of your data cache ... + the history data is saved as
pages in the data cache.
And if you have problems to identify the values for the liveCache parameters
On your system => Please create the ticket to the component 'BC-DB-LVC'
For SAP liveCache documentation in English: http://help.sap.com/saphelp_nw04/helpdata/en/f2/0271f49770f0498d32844fc0283645/frameset.htm
< -> Database Administration in CCMS: SAP liveCache -> liveCache Assistant ->
liveCache: Monitoring -> Current Status -> Memory Areas < -> Caches !! >
2) "How can I find the current filling level in % of OMS Heap.
I know that total size is defined by OMS_HEAP_LIMIT. Please let me
know if I am missing anything."
As you know, the liveCache allocates memory statically as well as
dynamically. The DATA CACHE is allocated statically.
When the database instance is started, the I/O buffer cache is created in
the main memory in accordance with the size entered in the general
database parameter CACHE_SIZE.
Additionally the liveCache allocates the OMS HEAP dynamically. 
The amount of the OMS HEAP memory depends on the runtime of OMS versions              
and the amount of data which is used by the transactions.
The OMS heap can grow dynamically until it reaches the maximum size
specified in the liveCache parameter OMS_HEAP_LIMIT.
For SAP liveCache documentation in English: http://help.sap.com/saphelp_nw04/helpdata/en/f2/0271f49770f0498d32844fc0283645/frameset.htm
< -> Database Administration in CCMS: SAP liveCache -> liveCache Assistant ->
liveCache: Monitoring -> Current Status -> Memory Areas < -> Heap Usage !! >
So:
-> You could use Heap Usage display in the LC10.
   < Currently used column -
       Size of the memory actually occupied by the OMS heap
    You could mark the column + click on 'Sum' => see the sum ... >
-> You could use the Memory node in the liveCache Alert Monitor under
   'Space Management' for LCA connection & you will see, for example:
       Heap Usage                         1 %     < day/time> 
       Heap Usage in KB                   18999 KB < day/time > 
-> Sorry, I didn't get clear on another posted questions.
   Could you please give the reference to the documents or notes where you saw
   those sentences.
Thank you and best regards, Natalia Khlopina