克米亚sap论坛,中国最好的sap论坛,sap系统,sap培训,kemiya,克米亚,sap账号,sap ides,sap mm,sap hana,sap fico,sap pp

 找回密码
 注册
查看: 109|回复: 1

ST02: Tune Summary

[复制链接]
kmy 发表于 2018-3-4 17:10:33 | 显示全部楼层 |阅读模式
Transaction code ST02 is used to display thecurrent status of  memory resource usage for a specific SAP application server.

1. The hit ratio for the R/3 buffers should be 98% or better. Hit ratio  less than 98% can be regarded as acceptable only for the Program buffer,  the single record buffer and export/import buffer. There should be no  swaps in the buffers. If there are swaps the buffer size or the max.  numbers of entries should be increased.(appr. 10000 swaps per day  represents an acceptable number of buffer displacements)
Hint:
• HitRatio – The percentage of data accesses that are satisfied by the buffer and do not require database accesses. HitRatio for each buffer > 98%.
• Check the free space & the free directory for each buffer.
• Check Hits, program buffers should be 10000 hits/day & for other buffers it should be 1000 hits/day.
Solution:
• Amend the Buffer parameter values by increasing the old value by  adding approx 10% and then restart the system. Buffer swapping is normal  as long as the HitRatio > 98% , then nothing need to be change.


2. If R/3 extended memory is full (when max.used > 80% in memory)  -> Go to Detail analysis menu -> SAP memory -> Mode list  Individual users consuming a lot of memory -> Analyze user actions.  Enlarge the R/3 extended memory if there is enough main memory. Hint: Current usage of Extended memory < 80%.

3. Hint: Hit ratio > 95% for “Select” and “Select Single”.

Additional note:
Hitratio : The percentage of data accesses that are satisfied by the buffer  and do not require database accesses.
Allocated : Max. amount of memory area that can be occupied by the respective buffer as defined by the parameter limiting the buffer size.
Free Space : Currently unoccupied memory space in the respective buffer.
Dir. Size Entries : Max. number of objects that can be stored in the buffer.
Swaps : Number of buffer objects displaced from the buffer.
Database access : Number of database access. (data transfers from the database into the buffer)
Free Directory Entries : Difference between the current number of objectsstored in the buffer and the max. possible number of objectes.

本帖子中包含更多资源

您需要 登录 才可以下载或查看,没有帐号?注册

x
yuans173 发表于 2018-3-7 08:35:55 | 显示全部楼层
感謝分享,很有用
您需要登录后才可以回帖 登录 | 注册

本版积分规则

QQ|克米亚sap论坛,sap账号,sap系统,sap ides,sap学习机,sap练习环境 ( 渝ICP备18002525号-5 )

GMT+8, 2018-6-22 11:14

Powered by Discuz! X3.4

© 2001-2017 Comsenz Inc.

快速回复 返回顶部 返回列表