方法论是什么
awr
占比较高,应该是异常
参数设置没有问题
检查统计数据
明显节点2多。
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netstat -p udp
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no -a|grep udp
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receive_space=655360
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send_space=65536
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sho parameter multib
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netstat -s | grep "packet reassembles failed"|awk '{print $1}'
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'netstat -s' 或 'netstat -su',并根据具体平台查看 "udpinoverflowsudpinoverflows", "packet receive errors", "fragments dropped" 或 "outgoing packet drop" 信息
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set lin 120
select to_char(sysdate,'yyyy-mm-dd') riqi, a.inst_id "instance", a.value "gc blocks lost",
b.value "gc cur blocks served",
c.value "gc cr blocks served",
round(a.value/(b.value c.value 0.01),1) ratio
from gv$sysstat a, gv$sysstat b, gv$sysstat c
where a.name='gc blocks lost' and
b.name='gc current blocks served' and
c.name='gc cr blocks served' and
b.inst_id=a.inst_id and c.inst_id = a.inst_id
order by 2;
select inst_id, event, total_waits,time_waited
from gv$system_event
where event in ('gc current block lost','gc cr block lost')
order by inst_id, total_waits desc;
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参考:http://blog.chinaunix.net/uid-20687159-id-5861931.html 超乎
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