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单选题
A system administrator is monitoring a system that has recently shown a decrease in performance.The administrator suspects that the system may be low on memory and may be paging excessively.Which of the following commands is best to identify a possible paging problem？（）
A
iostat
B
netstat
C
ps
D
vmstat
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lslpp -f IX49035B
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instfix -f IX49035D
instfix -ik IX49035
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