I work on SAP Product Support. There are a couple of incidents opened by customers related to high swaps in transaction ST02. My goal with this post is to share some information about causes and solutions related to this topic.
In transaction ST02, a few thousand swaps can be tolerated each day. However, you should consider to enlarge the buffer if you find more than 10000 swaps per day. As you can see in ST02 main screen, there are several types of buffer. The most problematic buffers are listed below:
- Nametab buffers: it is recommended that you check SAP Notes 16244 and 1398802. P.S.: check if you have run SGEN recently. I can tell youit is normal that a lot of nametab entries are required during SGEN.
- Export/import buffer: importing programs can occupies the buffer (in case you are transporting many requests). It is recommended that you check SAP Notes 702728 and 373986.
- Program buffer: it is recommended that you check SAP Notes 552778 and 147568.
Additional information about buffers can be found in the following notes:
SAP Note 1918603 – High swaps in transaction ST02
SAP Note 103747: Performance: Parameter recommendations as of Release 4.0
NOTE: It is difficult to say what are the exact values for the parameters of your system. It depends on several factors: number of concurrent users, workload, hardware resources, etc.