Oracle数据库故障处理-swap占用较高,AIX内存溢出

1 故障现象

主机hang死，而且使用vmstat命令发现b列产生大量的值

2 故障分析

关于AIX操作系统的参数maxclient%和maxperm%，该参数主要是限制aix filesystem使用或者直接占用os 物理内存的比例。

# vmo -p -o maxclient%=20
Modification to restricted tunable maxclient%, confirmation required yes/no yes
Setting maxclient% to 20 in nextboot file
Setting maxclient% to 20
Warning: a restricted tunable has been modified

# vmo -p -o maxperm%=20
Modification to restricted tunable maxperm%, confirmation required yes/no yes
Setting maxperm% to 20 in nextboot file
Setting maxperm% to 20
Warning: a restricted tunable has been modified
# nmon

# vmo -Fa|grep maxperm
                       maxperm = 6507114
                      maxperm% = 20
                strict_maxperm = 0
# vmo -Fa|grep maxclient 
                    maxclient% = 20
              strict_maxclient = 1
#