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？（）

单项选择题Whatcommandshouldasystemadministratorrunafterusinganeditortocreatethe etc tunables nextbootfile？（）

A.ksh -n nextboot
B.tunsave -a -f nextboot
C.tuncheck -r -f nextboot
D.diff $（vmtune） /etc/tunables/nextboot

单项选择题Whatstanzafiledoesasystemadministratorviewtodeterminewhatkernel-tuningparameterchangesweremadewhenthesystemwaslastbooted？（）

A./etc/rc.net
B./etc/tunables/tuning
C./etc/tunables/lastboot
D./usr/samples/kernel/nextboot

单项选择题An administrator attempted to run a sar -u report and received the following error：   sar： 0551-201 Cannot open  var adm sa sa07.   Which of the following should be scheduled in adm’s crontab to obtain sar reports？（）

A.sa1
B.sar
C.vmtune
D.schedtune

单项选择题A system administrator periodically receives calls from users who complain about poor performance with their application. Use the following sar command output to answer the question： Which of the following system resources need more investigation？（）

A.CPUs
B.Disk
C.Memory
D.NetworkX

单项选择题A system administrator ran the vmstat command because of performance problems. The output of the vmstat is given： Based on the output， which of the following is insufficient？（）

A.Disk
B.CPU
C.Memory
D.NetworkX