参数解释：
创新互联是一家专注于网站设计、成都网站建设与策划设计,清徐网站建设哪家好?创新互联做网站,专注于网站建设十年,网设计领域的专业建站公司;建站业务涵盖:清徐等地区。清徐做网站价格咨询:18982081108
-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]$