How to retain shared memory / SAP buffer for SAP restart or server reboot
I would like to retain the SAP buffer even after SAP is restarted or server is rebooted, so that user won't need to suffer from poor performance having SAP need to build up the buffer again. Any expert can help how this can be done ?
You don't need to do any thing special. because, for Program buffer (PXA) which is the most critical buffer for SAP system performance, SAP takes care of this to keep the hit ratio high even after instance restarts. To do this, SAP writes names of the programs contained within the PXA during shutdown to a file. During restart, this file (PXASTAT/PXANEW in the work directory of the instance) is read and the listed programs are put into the PXA )
This has also been described in SAP Note 23642.