Hi,
When system usage increases, then the swap count because of the movement of the buffers (LRU). I would say, initially going with you can try a system restart and check usage per day. Out of all the buffers, the program buffer is the one which is read more. If the usage of buffers increases heavily, then you have to check the buffer sizes.
You have some information related to buffers here:
http://help.sap.com/erp2005_ehp_04/helpdata/EN/c4/ 3a6e98505211d189550000e829fbbd/frameset.htm
Buffer tuning:
http://help.sap.com/erp2005_ehp_04/helpdata/EN/c4/ 3a6e98505211d189550000e829fbbd/frameset.htm
SAP buffers store frequently-used data, and make this data available to the local application server instance. The fact that each application server has its own buffers could result in data inconsistency across the various application servers (instances). To prevent data inconsistency, the SAP System uses periodical buffer synchronization, which is sometimes called buffer refresh.There is no general rule for increasing buffer parameters. You need to keep on monitoring and then fine tune all buffers. As a thumb rule generally increase 20-25% of what they are now but it all depends on swapping. Also consider hit ratio, for most of the buffers it should be around 99% except program buffers.
Regards,
Ram
| | | ---------------Original Message---------------
From: srinivas t
Sent: Tuesday, October 18, 2011 3:09 AM
Subject: How to Increase ECC 6.0 Performance Slowdown?
Hi gurus,
I am using Windows Server2003 r2 x64 sp2, SQL Server 2005 on ECC 6.0.
I want to increase the parameter or for SAP system performance
details of my sap ecc6.0 "ST02"
Buffer HitRatio % Alloc. KB Freesp. KB % Free Sp. Dir. Size FreeDirEnt % Free Dir Swaps DB Acc
Nametab (NTAB) 0
Table definition 84,36 13.596 8.503 74,55 40.000 29.818 74,55 0 10.450
Field definition 85,60 63.125 44.962 74,94 40.000 34.932 87,33 0 5.226
Short NTAB 89,40 7.250 5.938 98,97 10.000 9.758 97,58 0 242
Initial records 3,12 13.250 9.693 80,78 10.000 6.149 61,49 0 3.852
0
program 92,28 800.000 435.229 58,42 200.000 191.643 95,82 0 25.071
CUA 92,75 6.000 2.763 56,17 3.000 2.851 95,03 0 157
Screen 95,96 8.594 5.881 71,83 4.000 3.795 94,88 0 207
Calendar 100,00 684 442 66,57 400 285 71,25 0 115
OTR 100,00 4.096 3.375 100,00 2.000 2.000 100,00 0
0
Tables 0
Generic Key 98,57 58.594 5.083 9,16 10.000 5.206 52,06 9 11.485
Single record 47,20 20.000 6.902 35,09 1.000 888 88,80 1 175.675
0
Export/import 51,68 8.192 4.841 71,70 4.000 3.379 84,48 0
Exp./ Imp. SHM 25,00 4.096 3.331 98,70 2.000 1.999 99,95 0
Thank you,
Srinivaas T.
Mouritech |
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