这里简单介绍一下如何处理解决Linux平台下Oracle 19c启动时，告警日志出现ORA-00800错误的问题，详情介绍请见下面内容：
环境描述：
操作系统：Red Hat Enterprise Linux release 8.8 (Ootpa)
数据库 ：19.16.0.0.0 企业版
问题描述：
在Oracle 19c启动时，在Oracle的告警日志中会出现下面这样一条告警信息：
Errors in file /opt/oracle19c/diag/rdbms/gsp/gsp/trace/gsp_vktm_1900.trc (incident=51251) (PDBNAME=CDB$ROOT):
ORA-00800: soft external error, arguments: [Set Priority Failed], [VKTM], [Check traces and OS configuration], [Check Oracle documen
t and MOS notes], []
Incident details in: /opt/oracle19c/diag/rdbms/gsp/gsp/incident/incdir_51251/gsp_vktm_1900_i51251.trc
分析解决：
分析ORA-00800错误的信息，我们可以知道这个错误是由于不正确的系统配置或数据库设置导致的。这个失败目前对实例不是致命的，但是，这可能会导致在查询执行期间发生意外行为。所以最好还是解决掉这个问题
$ oerr ora 00800
00800, 00000, "soft external error, arguments: [%s], [%s], [%s], [%s], [%s]"
// *Cause: An improper system configuration or setting resulted in failure.
// This failure is not fatal to the instance at the moment, however, this might result
// in an unexpected behavior during query execution.
// *Action: Check the database trace files and rectify system settings or the configuration.
// For additional information, refer to Oracle database documentation or refer to
// My Oracle Support (MOS) notes.
首先，我们检查oradism文件的权限
$ cd $ORACLE_HOME/bin
$ ls -lrt oradism
-rwsr-x--- 1 root oinstall 147848 Apr 17 2019 oradism
如上所示，检查发现oradism文件的权限正常，如果它的权限不正常，那么就必须修改其权限（使用root用户授权）
chown root $ORACLE_HOME/bin/oradism
chmod 4750 $ORACLE_HOME/bin/oradism
然后我们检查数据库的优先级别：VKTM还是LMS*
SQL> set linesize 680
SQL> col Parameter for a30
SQL> col "Session Value" for a16
SQL> col "Instance Value" for a16
SQL> col "Description" for a30
SQL> select a.ksppinm "Parameter", b.ksppstvl "Session Value", c.ksppstvl "Instance Value", a.KSPPDESC "Description"
2 from x$ksppi a, x$ksppcv b, x$ksppsv c
3 where a.indx = b.indx and a.indx = c.indx and a.ksppinm like '_%' and a.ksppinm like '_highest_priority_process%';
Parameter Session Value Instance Value Description
------------------------------ ---------------- ---------------- ------------------------------
_highest_priority_processes VKTM VKTM Highest Priority Process Name
Mask
SQL>
如上所示，此参数值设置正确，如果不正确的话，那么必须优先级为VKTM
alter system set "_high_priority_processes"='VKTM' scope=spfile;
然后我们检查Cgroup配置
$ ps -eaf|grep -i vktm |grep -v grep
oracle 1900 1 0 13:53 ? 00:00:00 ora_vktm_gsp
$ cat /proc/1900/cgroup | grep cpu
7:cpu,cpuacct:/user.slice
2:cpuset:/
$ ps -eaf|grep -i pmon|grep -v grep
oracle 1888 1 0 13:53 ? 00:00:00 ora_pmon_gsp
$ cat /proc/1888/cgroup | grep cpu
7:cpu,cpuacct:/user.slice
2:cpuset:/
检查发现设置显示其他路径，检查cpu.rt_runtime_us的值，如下所示
# cat /sys/fs/cgroup/cpu,cpuacct/system.slice/cpu.rt_runtime_us
0
# cat /sys/fs/cgroup/cpu,cpuacct/user.slice/cpu.rt_runtime_us
0
根据官方文档其值应该为0和950000，可以使用下面命令修改，但是系统重启后，此参数设置会失效
echo 0 > /sys/fs/cgroup/cpu,cpuacct/system.slice/cpu.rt_runtime_us
echo 950000 > /sys/fs/cgroup/cpu,cpuacct/user.slice/cpu.rt_runtime_us
如果要使其永久生效，我们必须在cgconfig.conf文件中设置，具体操作也很简单，官方文档[1]中有详细步骤，具体如下所示：
Install libcgroup-tools* on the system. (You can find this package on OL7 latest repository)
# yum install libcgroup-tools
/etc/cgconfig.conf will be created automatically when you start cgconfig service
# systemctl start cgconfig
Edit /etc/cgconfig.conf with user.slice parameter below.
group user.slice {
cpu {
cpu.rt_period_us = 1000000;
cpu.rt_runtime_us = 950000;
}
}
Restart cgfconfig service so the value will take effect.
# systemctl restart cgconfig
Enable cgconfig so it will take effect during reboot.
#systemctl enable cgconfig
Reboot the server and check the value if it is now persistent.
处理过后，验证测试，这个错误解决了。重启Oracle实例，告警日志中不会出现ORA-00800错误了。问题解决了，更多详细分析，建议参考ORA-00800: soft external error, arguments: [Set Priority Failed], [VKTM] (Doc ID 2931494.1)[2]
参考资料
1: https://support.oracle.com/epmos/faces/DocumentDisplay?id=2718971.1&displayIndex=1#FIX文章来源：https://www.toymoban.com/news/detail-741812.html
[2]2: https://support.oracle.com/epmos/faces/DocumentDisplay?id=2718971.1文章来源地址https://www.toymoban.com/news/detail-741812.html
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