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Transaction ST02

Former Member
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I am a beginner on Basis work and I would like to know how to read transaction ST02 in hopes of increasing system performance. For our application servers, ST02 shows a lot of red-highlighted values for the SWAPS. I would appreciate some help in interpreting the data.

Also, any helps to increase system performance would be appreciated.

Buffer Swaps

Nametab (NTAB) 0

Table definition 31,061

Field definition 64,304

Short NTAB 0

Initial records 55,497

program 125,200

CUA 38,814

Screen 0

Calendar 0

OTR 0

Tables 0

Generic Key 860

Single record 76

Export/import 35,862

Exp./ Imp. SHM 0

Thanks,

Blake

Accepted Solutions (1)

Accepted Solutions (1)

Former Member
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Hi Blake,

swaps in the buffer can lead to a poor performance but don't have to. E.g. up to 10.000 swaps/day in the program buffer is ok to my knowledge.

But more important is the hitratio. The nearer to 100%, the better and it should be not lower than 90%. If the system was just started, the hitratio will increase over time. For example, in our system most buffers are >99%, with "Initial records" as an exception (60% )

Swaps occur in "Initial records", program and export/import. We increased the buffer for exp/imp but that was just because we had the spare memory and it looks better ;-). The swaps went down a bit, but still there are very many.

The online-help for this topic is pretty good in my opinion (in st02, call menu Help -> Application Help ). SAPPress also has some good books for system administration.

Regards,

ulf

Answers (1)

Answers (1)

Former Member
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Hi

To my knowledge swaps occur for 2 reasons

1:When there is no enought free space left in the buffer to for buffering the new objects

2:Buffers run out of free directory entries

Just drill out in http://help.sap.com or in SDN searching for ST02