on 03-10-2009 3:41 PM
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
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
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
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
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
User | Count |
---|---|
81 | |
24 | |
11 | |
9 | |
7 | |
5 | |
5 | |
5 | |
4 | |
4 |
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.