https://community.sap.com/t5/application-development-and-automation-discussions/st12-measurements-keep-changing-for-same-input-data-was-performance-check/m-p/7924815#M1599103 <HTML><HEAD></HEAD><BODY><P>No, there is no easy way to avoid it. In general we (at SAP) always analyze the second execution of the transaction to make sure that the buffers are filled. In a well-tuned system the data that are more or less often accessed are staying in the buffer.</P><P>And in case the data is displaced from the DB buffer, you have to live with the disk reads.</P></BODY></HTML> Tue, 14 Jun 2011 11:01:11 GMT yuri_ziryukin 2011-06-14T11:01:11Z https://community.sap.com/t5/application-development-and-automation-discussions/st12-measurements-keep-changing-for-same-input-data-was-performance-check/m-p/7924814#M1599102 <HTML><HEAD></HEAD><BODY><P>Hello everyone,</P><P></P><P>i am using Tcode ST12 for runtime analysis of a transaction. But the problem is that everytime i execute the trace, the statistics keep changing for the same input data. (especially d/b times). I guess this must be because the data gets buffered after the first time and the data is fetched from the buffer next time the transaction is run. </P><P></P><P>Is there a way to avoid this so i can get accurate statistics?</P><P></P><P>Regards,</P><P>Xineohpi.</P><P></P><P>Edited by: Thomas Zloch on Jun 14, 2011 1:23 PM - subject enhanced by moderator</P></BODY></HTML> Tue, 14 Jun 2011 09:57:37 GMT https://community.sap.com/t5/application-development-and-automation-discussions/st12-measurements-keep-changing-for-same-input-data-was-performance-check/m-p/7924814#M1599102 Former Member 2011-06-14T09:57:37Z https://community.sap.com/t5/application-development-and-automation-discussions/st12-measurements-keep-changing-for-same-input-data-was-performance-check/m-p/7924815#M1599103 <HTML><HEAD></HEAD><BODY><P>No, there is no easy way to avoid it. In general we (at SAP) always analyze the second execution of the transaction to make sure that the buffers are filled. In a well-tuned system the data that are more or less often accessed are staying in the buffer.</P><P>And in case the data is displaced from the DB buffer, you have to live with the disk reads.</P></BODY></HTML> Tue, 14 Jun 2011 11:01:11 GMT https://community.sap.com/t5/application-development-and-automation-discussions/st12-measurements-keep-changing-for-same-input-data-was-performance-check/m-p/7924815#M1599103 yuri_ziryukin 2011-06-14T11:01:11Z https://community.sap.com/t5/application-development-and-automation-discussions/st12-measurements-keep-changing-for-same-input-data-was-performance-check/m-p/7924816#M1599104 <HTML><HEAD></HEAD><BODY><P>thanx!! </P><P></P><P>take care</P></BODY></HTML> Tue, 14 Jun 2011 11:39:24 GMT https://community.sap.com/t5/application-development-and-automation-discussions/st12-measurements-keep-changing-for-same-input-data-was-performance-check/m-p/7924816#M1599104 Former Member 2011-06-14T11:39:24Z