I often use vmstat on Linux looking on the columns si and so equals to 0 (swap in and swap out) and when the free command, the free column you will also have no or very low swap being used /home/oracle> vmstat 1 How are you to prove that you have a memory shortage? When using top you have this summary below.There you may see what is being using for what but there is not much granularity there. On the memory session you will see 3 categories, INUSE, FREE and FILECACHE. REF1 SRAD TOTALMEM INUSE FREE FILECACHE HOMETHRDS CPUS Topas Monitor for host: SERVER1 Interval: 2 Sat Dec 8 03:39:59 2019 When opening topas and hitting M you will see this below.When checking the capacity there are some practical things that always help me to get a fast glimpse of the system: So one of the most important things that we need to do when setting up a new server or checking the capacity of the server is to see how much memory Oracle is using.
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