Monday, August 3, 2020

ORA-16198: Received timed out error from KSR & LAD:2 network reconnect

I have setup Data Guard and log synchronization happening without any issue but recently I found below errors, which are happening rarely in alert.log file

GWR (PID:13557): ORA-16198: Received timed out error from KSR
LGWR (PID:13557): Attempting LAD:2 network reconnect (16198)
LGWR (PID:13557): LAD:2 n
etwork reconnect abandoned
Errors in file /oracle/diag/rdbms/orcl/ORCL/trace/orcl_lgwr_13557.trc:
ORA-16198: Timeout incurred on internal channel during remote archival
LGWR (PID:13557): Error 16198 for LNO:2 to 'orcl_stdby'
LGWR (PID:13557): Failed to archive LNO:2 T-1.S-5003, error=16198
LGWR (PID:13557): Error 16198 disconnecting from LAD:2 standby host 'orcl_stdby'

Redo Transport Services failed with ORA-16198 error from primary database standby database using LGWR SYNC mode.

Data Guard Broker log shows below error messages…

Data Guard Broker Status Summary:
  Type                        Name                             Severity  Status
  Configuration               orcl_dg_fsfconf                   Warning  ORA-16608: one or more members have warnings
  Primary Database            orcl                              Success  ORA-0: normal, successful completion
  Physical Standby Database   orcl_stdby                        Warning  ORA-16853: apply lag has exceeded specified threshold

When I very configuration everything looks good and no issues.

DGMGRL for Linux: Release - Production on Mon Aug 3 15:19:29 2020
Copyright (c) 1982, 2019, Oracle and/or its affiliates. All rights reserved.
Welcome to DGMGRL, type "help" for information.
Connected to "ORCL"
Connected as SYSDBA.
DGMGRL> show configuration;
Configuration - orcl_dg_fsfconf
Protection Mode: MaxAvailability
orcl - Primary database
orcl_stdby - Physical standby database
Fast-Start Failover: Disabled
Configuration Status:
SUCCESS (status updated 34 seconds ago)

If this is happening frequently then it is critical and must take action immediately. In my case it is happening rarely which lean towards time out setting. I see that my current DB has net_timeout as 30.
After research, I have increased the net_timeout to 60 and issue has been resolved.

In case if you are not using Data Guard broker then you can run below command from SQL*Plus
SQL> alter system set log_archive_dest_2 service="orcl_stdby", SYNC AFFIRM delay=0 optional compression=disable max_failure=0 reopen=300 db_unique_name="orcl_stdby" net_timeout=30, valid_for=(online_logfile,all_roles)

In case if you are using DGMGRL command-line interface, then you can run below command


Satishbabu G, Oracle ACE


  1. Nice post!..good information,it is really really impressed me alot and i just loved it.Thanks for posting such an informative content:
    Local Packers And Movers Bangalore

  2. افضل الخدمات الخاصة باعمال نقل العفش مع الفك والتركيب في الطائف تقدمها افضل شركه نقل عفش بالطائف وهي تعتبر من افضل الشركات المتخصصة في اعمال نقل الاثاث بواسطة فريق عمل مميز ومحترف وسيارات نقل عفش حديثة ومجهزة لأعمال شركات نقل الاثاث بالطائف مقفلة ومبطنة من الداخل وستحصل على افضل خدمات نقل الاثاث بالطائف باحترافية عالية وبالضمان من افضل شركات نقل عفش الطائف المتميزة والمؤهلة

  3. اقوى الخدمات الخاصة بأعمال نقل العفش مع الفك والتركيب في الرياض يقدمها موقع خدماتي الذي يضم افضل شركة نقل عفش بالرياض التي تقدم خدماتها بمنتهى الاحترافية والدقة معتمدين على فريق عمل مدرب جيدا ونجارين متخصصين لتقديم خدمات شركات نقل الاثاث بالرياض باحترافية عالية وجودة غير مسبوقة