后台告警日志有些信息：
OS Audit file could not be created; failing after 6 retries
OS Audit file could not be created; failing after 6 retries
OS Audit file could not be created; failing after 6 retries
不明所以
似乎是审计文件无法创建，尝试了6次后还是失败了
sho parameter audit
检查目录有，进入后touch a也没错，说明权限没问题
df -h 充足
df -i 没超
ls |wc -l 20多万个aud文件，太多
清理之
cd $ORACLE_BASE/admin/
find ./adump -name *.aud -mtime +5 -exec rm -f {} \;
只剩1万多个了，告警日志不再提示上述6次后失败的信息
crontab 加个任务定期清理
1 1 * * * find /u01/app/oracle/admin/orcl/adump -name *.aud -mtime +5 -exec rm -f {} \;
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