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ST02 - Explaining SAP buffer history statistics (IRDB buffer)

Hi all,

although I have read SAP Help on memory and buffer management, I could not fully understand, why there are swaps occurring in our BW system on the initial records buffer (IRDB).

Below, is the history of the buffer. The system was restarted on 6.3.2011.

What I do not understand is, why are swaps occurring, although there are quite a few lines, where the free storage and free objects numbers look ok.

Can someone help me explaining and interpreting the figures below?

App.Server    Buffer Name
Date           Hit rate DB quality Al.adr.sp. St.avail. Free Stor. DB acc. Max. obj. Free Objs Swapped o. Time

merry2_P70_01 Initial record buffer (IRBD)
Thu 17.03.2011 43,1856    43,1876      8.938     8.000      3.388  73.738     7.500     2.687     68.583  14:10:17
Wed 16.03.2011 43,1296    43,1317      8.938     8.000      3.604  68.317     7.500     3.815     64.298  23:10:13
Tue 15.03.2011 43,5014    43,5038      8.938     8.000        267  62.108     7.500     1.173     55.458  23:10:12
Mon 14.03.2011 43,5476    43,5495      8.938     8.000      1.272  52.197     7.500     2.476     46.875  23:10:13
Sun 13.03.2011 42,8283    42,8317      8.938     8.000        797  43.365     7.500     1.691     37.352  23:10:09
Sat 12.03.2011 42,4691    42,4725      8.938     8.000        883  43.198     7.500     1.858     37.352  23:10:09
Fri 11.03.2011 41,9100    41,9134      8.938     8.000      1.215  42.391     7.500     2.637     37.352  23:10:08
Thu 10.03.2011 42,8748    42,8784      8.938     8.000      5.109  34.606     7.500     1.111     28.052  23:10:09
Wed 09.03.2011 42,0119    42,0163      8.938     8.000      6.319  27.279     7.500     1.878     21.511  23:10:09
Tue 08.03.2011 39,8539    39,8602      8.938     8.000        681  19.267     7.500     1.298     12.993  23:10:07
Mon 07.03.2011 31,2259    31,2294      8.938     8.000      5.548  12.127     7.500     2.097      6.670  23:09:59
Sun 06.03.2011  3,0760     3,0797      8.938     8.000      6.986   1.605     7.500     5.895          0  23:10:04
Sat 05.03.2011 40,4172    40,4240      8.938     8.000      1.564  39.173     7.500     2.685     34.236  23:10:05
Fri 04.03.2011 40,2436    40,2511      8.938     8.000      1.800  38.697     7.500     3.161     34.236  23:10:25
Thu 03.03.2011 37,5070    37,5154      8.938     8.000      5.513  33.468     7.500     1.602     27.473  23:10:10
Wed 02.03.2011 36,7039    36,7126      8.938     8.000      1.101  26.644     7.500     3.376     22.446  23:10:03
Tue 01.03.2011 36,1056    36,1152      8.938     8.000        432  19.145     7.500     1.296     12.919  23:10:02
Mon 28.02.2011 31,2787    31,2935      8.938     8.000      5.843  11.654     7.500     3.100      7.247  23:10:17
Sun 27.02.2011  3,0358     3,0451      8.938     8.000      6.991   1.592     7.500     5.908          0  23:10:20
Sat 26.02.2011 46,8543    46,8606      8.938     8.000        673  39.540     7.500       945     32.749  23:10:26
Fri 25.02.2011 46,5937    46,6000      8.938     8.000        652  39.375     7.500       991     32.630  23:10:34
Average        37,0645    37,0701      8.938     8.000      2.888  34.737     7.500     2.461     29.544

Thanks in advance for any help!

Best regards,

Philipp

Former Member

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