Huge Memory Consumption

Hello Everyone,
I have been checking a maxdb system and can see huge memory consumption occurring:
top - 12:29:10 up 842 days, 2:59, 5 users, load average: 18.59, 17.80, 11.77
Tasks: 728 total,   2 running, 723 sleeping,   0 stopped,   3 zombie
Cpu(s): 8.5%us, 0.7%sy, 0.0%ni, 88.8%id, 0.3%wa, 0.0%hi, 0.3%si, 1.4%st
Mem:     47509M total,    47129M used,      379M free,      210M buffers
Swap:    20479M total,     1475M used,    19004M free,     5386M cached
PID USER      PR NI VIRT RES SHR S %CPU %MEM    TIME+ COMMAND
26644 sdb       20   0 39.8g 38g 306m S 126 82.3 52654:06 kernel
7136 sdb       20   0 77304 16m 4692 S    8 0.0   1:12.69 dbmsrv
2860 root      20   0     0    0    0 S    3 0.0   2837:24 nfsiod
208 root      20   0     0    0    0 S    2 0.0   2448:01 rpciod/2
I could not see any long running db transactions, background jobs, deadlocks
Please provide any valuable inputs on how to check the issue further
Regards,
Vinay

Hello Vinay,
what are you wondering about?
That the database uses 82.3% of the memory?
In MAXDB there exists a parameter called:
CACHE_SIZE (MaxDB < 7.7.03) respectively CacheMemorySize (MaxDB >= 7.7.03)
"The value specifies the i/o capable memory used by different
MaxDB components in particular the data cache, converter and
the shared catalog cache."
When the database starts it allocates the memory given by the parameter. This memory is reserved for the db. It will not become free if there is no activity on the db.
See also:
MaxDB Memory Sizing - MaxDB - SCN Wiki
Regards,
Michael

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Last edited by Verge (2011-08-16 14:04:09)

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To answer my own question: I could find no answer to this myself and, with there being no replies in this forum, I have resorted to re-capturing the affected HDV tapes from scratch.
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Hi SAP Gurus,
Could I kindly request for your inputs concerning the following scenario?
To put it quite simply, we have a program where we're required to retrieve all the fields from a lengthy custom table, i.e. the select statement uses an asterisk. Unfortunately, there isn't really a way to avoid this short of a total overhaul of the code, so we had to settle with this (for now).
The program retrieves from the database table using a where clause filtering only to a single value company code. Kindly note that company code is not the only key in the table. In order to help with the memory consumption, the original developer had employed retrieval by packages (also note that the total length of each record is 1803...).
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First, in general you not provided enough details to get any help. OS? OS version? Hardware specifics?
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Hi,
I am able to get information on the number of instances loaded, the memory occupied by those instances using heap histogram.
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I don't know what profiler you are using but many memory profilers can tell you where the strings are allocated.

Huge Memory Consumption

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