Scan Rate is the most important indicator. There’s a threshold to look for. It indicates “number of pages per second scanned by the page stealing daemon” in unix but not windows. http://www.dba-oracle.com/oracle10g_tuning/t_server_ram.htm is concise
Paging (due to insufficient Physical memory) is another important indicator, correlated with Scan Rate. There’s a threshold to look for.
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