The most famous tools are top (default), htop and nmon (contained in the most repositories). The OS memory monitoring is totally useless if you want to use it for monitoring HANA systems.
As you may know there is a big difference in cause of the Unix memory concept and how an application handles its memory. The most common Linux systems are mixed mode systems using paging and swapping.Ī lot of customers are asking me in context of monitoring if the systems behavior is correct when the used memory is close to the physical memory size. With paging, when the kernel requires more main memory for an active process, only the least recently used pages of processes are moved to the swap space. To swap a process means to move that entire process out of main memory and to the swap area on hard disk, whereby all pages of that process are moved at the same time. Swapping is the older method of moving data from memory to disk. But is swapping and paging the same?Ī lot of people mean paging when they are talking about swapping.
One of the worst things which could happen to such a system in context of performance is swapping or paging. For more information about Oracle (NYSE:ORCL), visit the Linux memory management of a SAP system (application server) or SAP HANA system getting more important since the clear roadmap of SAP (Linux as only OS for HANA) is showing that the amount of Linux installations is rising steeply. Oracle offers a comprehensive and fully integrated stack of cloud applications and platform services. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. Check 10 Top processes which are consuming RSS ( Resident Set Size ) Check which most Top 10 users are consuming memory on system in percentageĤ. Calculate memory usage using free commandģ. To view full details, sign in with your My Oracle Support account.ĭon't have a My Oracle Support account? Click to get started!Ģ. This document describes how to calculate Linux memory usage.
Oracle Cloud Infrastructure - Version N/A and later Linux OS - Version Oracle Linux 4.4 and later Oracle Linux: How to Calculate Memory Usage
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