检查数据库，发现一个节点alert日志正常，另一个节点alert日志如下

2019-03-13T18:48:43.105236+08:00

Archived Log entry 11681 added for T-2.S-2902 ID 0xc3109d85 LAD:1
2019-03-13T18:52:57.423641+08:00
TT02: Standby redo logfile selected for thread 2 sequence 2903 for destination LOG_ARCHIVE_DEST_2
2019-03-13T19:04:53.919412+08:00
KILL SESSION for sid=(581, 24669):
  Reason = alter system kill session
  Mode = KILL SOFT -/-/-
  Requestor = USER (orapid = 159, ospid = 21879, inst = 2)
  Owner = Process: USER (orapid = 9, ospid = 5313)
  Result = ORA-0
2019-03-13T19:05:12.685498+08:00
KILL SESSION for sid=(879, 15503):
  Reason = alter system kill session
  Mode = KILL SOFT -/-/-
  Requestor = USER (orapid = 159, ospid = 21879, inst = 2)
  Owner = Process: USER (orapid = 78, ospid = 31568)
  Result = ORA-0
2019-03-13T19:27:10.469819+08:00
KILL SESSION for sid=(949, 25776):
  Reason = alter system kill session
  Mode = KILL SOFT -/-/-
  Requestor = USER (orapid = 159, ospid = 21879, inst = 2)
  Owner = N/A
  Result = ORA-27
2019-03-13T19:27:39.835691+08:00
KILL SESSION for sid=(949, 25776):
  Reason = alter system kill session
  Mode = KILL SOFT -/-/-
  Requestor = USER (orapid = 159, ospid = 21879, inst = 2)
  Owner = N/A
  Result = ORA-27