参数解释：
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-C 3：显示ORA- 报错上三行以及下三行信息
-n 100：100行中寻找是否有ORA-报错信息
[oracle@xiong:/oracle/app/oracle/diag/rdbms/itpuxdb/itpuxdb/trace]$ tail -n 100 alert_itpuxdb.log |grep -C 3 ORA-
Time drifts can result in an unexpected behavior such as time-outs. Please check trace file for more details.
Tue Mar 17 14:58:27 2020
ALTER DATABASE CLEAR LOGFILE GROUP 1
ORA-1624 signalled during: ALTER DATABASE CLEAR LOGFILE GROUP 1...
Tue Mar 17 20:59:06 2020
Warning: VKTM detected a time drift.
Time drifts can result in an unexpected behavior such as time-outs. Please check trace file for more details.
[oracle@xiong:/oracle/app/oracle/diag/rdbms/itpuxdb/itpuxdb/trace]$
