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# free
            total       used       free     shared    buffers     cached
Mem:       1034332      50752     983580          0       7288      21052
-/+ buffers/cache:      22412    1011920
Swap:      1992012          0    1992012
swap×îÉÙ1.5GÒÔÉÏ£¬·ñÔòOracle°²×°µ½×îºó»á±¨´í¡£
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# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             7.4G  3.3G  3.8G  47% /
none                  506M     0  506M   0% /dev/shm
/dev/sdb2             6.5G   47M  6.2G   1% /opt
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# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.228.220
NETMASK=255.255.255.0
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# echo "kernel.hostname=ora01" >> /etc/sysctl.conf
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OracleÖÐΪʲôwhere rownum > 3 ²éÕÒ²»µ½Êý¾Ý£¿

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select emp_id,rownum from emp
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2         ?   2
3         ?   3
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