alert 日志如下

Fatal NI connect error 12170.

  VERSION INFORMATION:

TNS for Linux: Version 11.2.0.4.0 - Production

Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.4.0 - Production

TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.4.0 - Production

  Time: 19-JUL-2019 07:49:33

  Tracing not turned on.

  Tns error struct:

    ns main err code: 12535

TNS-12535: TNS:operation timed out

    ns secondary err code: 12606

    nt main err code: 0

    nt secondary err code: 0

    nt OS err code: 0

  Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.60.211)(PORT=59763))

Fri Jul 19 08:00:03 2019

Thread 2 advanced to log sequence 2251 (LGWR switch)

  Current log# 3 seq# 2251 mem# 0: +DATA/dbrac/onlinelog/group_3.265.993309649

  Current log# 3 seq# 2251 mem# 1: +FRA/dbrac/onlinelog/group_3.259.993309649

Fri Jul 19 08:00:03 2019

Archived Log entry 8781 added for thread 2 sequence 2250 ID 0x38e22045 dest 1:

Archived Log entry 8782 added for thread 2 sequence 2250 ID 0x38e22045 dest 2:

Fri Jul 19 08:03:33 2019

Fatal NI connect error 12170.

  VERSION INFORMATION:

TNS for Linux: Version 11.2.0.4.0 - Production

Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.4.0 - Production

TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.4.0 - Production

  Time: 19-JUL-2019 08:05:33

  Tracing not turned on.

  Tns error struct:

    ns main err code: 12535

TNS-12535: TNS:operation timed out

    ns secondary err code: 12606

    nt main err code: 0

    nt secondary err code: 0

    nt OS err code: 0

  Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.60.211)(PORT=59899))

Fri Jul 19 08:11:33 2019

这个数据库前端应用有tomcat   请问如何处理这种报警？网上有说可以不处理，但是很难看。  反复出现，频率极高

请给予指点，十分感谢