{"id":15303,"date":"2020-03-13T11:11:44","date_gmt":"2020-03-13T11:11:44","guid":{"rendered":"https:\/\/dbtut.com\/?p=15303"},"modified":"2020-03-16T12:34:26","modified_gmt":"2020-03-16T12:34:26","slug":"ora-16198-lgwr-received-timedout-error-from-ksr","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2020\/03\/13\/ora-16198-lgwr-received-timedout-error-from-ksr\/","title":{"rendered":"ORA-16198: LGWR received timedout error from KSR"},"content":{"rendered":"

Redo Transport to the standby has stopped after the ORA-16198 <\/span>error.<\/p>\n

ERROR<\/h3>\n

ORA-16198: LGWR received timedout error from KSR<\/em><\/span>
\nLGWR: Attempting destination LOG_ARCHIVE_DEST_2 network reconnect (16198)<\/em><\/span>
\nLGWR: Destination LOG_ARCHIVE_DEST_2 network reconnect abandoned<\/em><\/span>
\nError 16198 for archive log file 4 to ‘mwstdbydb’<\/em><\/span>
\nORA-16198: LGWR received timedout error from KSR<\/em><\/span>
\nLGWR: Error 16198 disconnecting from destination LOG_ARCHIVE_DEST_2 standby host ‘hostname’<\/em><\/span><\/p>\n

SOLUT\u0130ON<\/h3>\n

You may encounter this error if a network delay occurs while the Redo Transport mode of the error is SYNC. On top of that, if you set Redo Transport mode as ASYNC, the problem will be solved. Solution steps are below.<\/p>\n

Step1:<\/h4>\n

Check the data is sync by quering the tables that frequently changed on primary and standby.<\/p>\n

SQL> select count(*) from yourtablename;\r\n\r\n  COUNT(*)\r\n----------\r\n      x\r\n\r\n[MWSTDBYDB1]\r\nSQL> select count(*) from yourtablename;\r\n\r\n  COUNT(*)\r\n----------\r\n      y<\/pre>\n
Step2:<\/h4>\n
Check if there is a lag on standby?<\/p>\n
SQL> set linesize 9000\r\nSQL> column name format a25\r\nSQL> column value format a20\r\nSQL> column time_computed format a25\r\nSQL> SELECT name, value, time_computed FROM v$dataguard_stats;\r\n\r\nNAME                      VALUE                TIME_COMPUTED\r\n------------------------- -------------------- -------------------------\r\ntransport lag             +00 00:20:30         04\/06\/2017 14:37:30\r\napply lag                 +00 00:20:30         04\/06\/2017 14:37:30\r\napply finish time         +00 00:01:21.338     04\/06\/2017 14:37:30\r\nestimated startup time    52                   04\/06\/2017 14:37:30<\/pre>\n
Step3:<\/h4>\n
At the end of the researches, it was seen that the problem was a network delay when the Redo Transport mode was SYNC. For this reason, Redo Transport mode was taken to ASYNC.<\/p>\n
Set Redo Transport Mode to ASYNC:<\/h4>\n
On Primary:<\/strong><\/p>\n
SQL> alter system set log_archive_dest_2='SERVICE=standbydb ASYNC NOAFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=mwstdbydb' scope=both sid='*';\r\nSystem altered.<\/pre>\n
After the above procedure, the alert logs in the primary are as follows.<\/p>\n
PrimaryInstance1<\/strong><\/p>\n
Thu Apr 06 14:40:24 2017\r\nNSA2 started with pid=1094, OS id=6564 \r\nThu Apr 06 14:40:28 2017\r\nLGWR: Failed to archive log 4 thread 1 sequence 24591 (16198)\r\nThread 1 advanced to log sequence 24592 (LGWR switch)\r\n  Current log# 5 seq# 24592 mem# 0: +DATA\/mwdb\/onlinelog\/group_5.268.864559847\r\nLNS: Standby redo logfile selected for thread 1 sequence 24592 for destination LOG_ARCHIVE_DEST_2\r\nThu Apr 06 14:40:30 2017\r\nALTER SYSTEM SET log_archive_dest_2='SERVICE=mwstdbydb ASYNC NOAFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=mwstdbydb' SCOPE=BOTH;\r\nThu Apr 06 14:40:30 2017\r\nLOGMINER: End   mining logfile for session 4 thread 1 sequence 24591, +DATA\/mwdb\/onlinelog\/group_4.273.864560049\r\nLOGMINER: Begin mining logfile for session 4 thread 1 sequence 24592, +DATA\/mwdb\/onlinelog\/group_5.268.864559847\r\nLOGMINER: End   mining logfile for session 4 thread 2 sequence 20308, +DATA\/mwdb\/onlinelog\/group_6.269.864559929\r\nLOGMINER: Begin mining logfile for session 4 thread 2 sequence 20309, +DATA\/mwdb\/onlinelog\/group_7.265.864560013\r\nThu Apr 06 14:40:42 2017\r\nArchived Log entry 57955 added for thread 1 sequence 24591 ID 0x6e72f9d8 dest 1:\r\nThu Apr 06 14:40:42 2017\r\nARCd: Standby redo logfile selected for thread 1 sequence 24591 for destination LOG_ARCHIVE_DEST_2\r\nThu Apr 06 14:44:10 2017\r\nLOGMINER: parent not found: XID 0x1c31.007.001131de\r\nLOGMINER: thread 1 RBA 0x006010.00011cf8.00bc, Parent XID 0x1c31.007.001131de\r\nThu Apr 06 14:54:42 2017\r\nALTER SYSTEM SET log_archive_dest_2='SERVICE=mwstdbydb ASYNC NOAFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=mwstdbydb' SCOPE=BOTH SID='*';<\/pre>\n
PrimaryInstance2<\/strong><\/p>\n
Thu Apr 06 14:40:27 2017\r\nNSA2 started with pid=1194, OS id=7826 \r\nThu Apr 06 14:40:32 2017\r\nLGWR: Failed to archive log 6 thread 2 sequence 20308 (16198)\r\nThread 2 advanced to log sequence 20309 (LGWR switch)\r\n  Current log# 7 seq# 20309 mem# 0: +DATA\/mwdb\/onlinelog\/group_7.265.864560013\r\nLNS: Standby redo logfile selected for thread 2 sequence 20309 for destination LOG_ARCHIVE_DEST_2\r\nThu Apr 06 14:40:40 2017\r\nArchived Log entry 57954 added for thread 2 sequence 20308 ID 0x6e72f9d8 dest 1:\r\nThu Apr 06 14:40:40 2017\r\nARCf: Standby redo logfile selected for thread 2 sequence 20308 for destination LOG_ARCHIVE_DEST_2<\/pre>\n
StandbyInstance1<\/strong><\/p>\n
Thu Apr 06 14:40:30 2017\r\nPrimary database is in MAXIMUM PERFORMANCE mode\r\nRFS[16]: Assigned to RFS process 12056\r\nRFS[16]: Selected log 12 for thread 1 sequence 24592 dbid 1853001179 branch 864558941\r\nThu Apr 06 14:40:33 2017\r\nPrimary database is in MAXIMUM PERFORMANCE mode\r\nRFS[17]: Assigned to RFS process 12058\r\nRFS[17]: Selected log 16 for thread 2 sequence 20309 dbid 1853001179 branch 864558941\r\nThu Apr 06 14:40:40 2017\r\nRFS[18]: Assigned to RFS process 12074\r\nRFS[18]: Selected log 17 for thread 2 sequence 20308 dbid 1853001179 branch 864558941\r\nThu Apr 06 14:40:42 2017\r\nRFS[19]: Assigned to RFS process 12076\r\nRFS[19]: Selected log 11 for thread 1 sequence 24591 dbid 1853001179 branch 864558941\r\nThu Apr 06 14:40:47 2017\r\nArchived Log entry 536 added for thread 2 sequence 20308 ID 0x6e72f9d8 dest 1:\r\nThu Apr 06 14:40:54 2017\r\nArchived Log entry 537 added for thread 1 sequence 24591 ID 0x6e72f9d8 dest 1:<\/pre>\n
StandbyInstance2<\/strong><\/p>\n
Thu Apr 06 14:40:55 2017\r\nMedia Recovery Waiting for thread 1 sequence 24592 (in transit)\r\nRecovery of Online Redo Log: Thread 1 Group 12 Seq 24592 Reading mem 0\r\n  Mem# 0: +DATA\/mwstdbydb\/onlinelog\/group_12.270.939160351\r\n  Mem# 1: +FRA\/mwstdbydb\/onlinelog\/group_12.264.939160353\r\nMedia Recovery Waiting for thread 2 sequence 20309 (in transit)\r\nRecovery of Online Redo Log: Thread 2 Group 16 Seq 20309 Reading mem 0\r\n  Mem# 0: +DATA\/mwstdbydb\/onlinelog\/group_16.266.939160365\r\n  Mem# 1: +FRA\/mwstdbydb\/onlinelog\/group_16.260.939160367<\/pre>\n
Step4:<\/h4>\n
Check if there is a lag on standby again.<\/p>\n
SQL> set linesize 9000\r\nSQL> column name format a25\r\nSQL> column value format a20\r\nSQL> column time_computed format a25\r\nSQL> SELECT name, value, time_computed FROM v$dataguard_stats;\r\n\r\nNAME                      VALUE                TIME_COMPUTED\r\n------------------------- -------------------- -------------------------\r\ntransport lag             +00 00:00:00         04\/06\/2017 14:42:23\r\napply lag                 +00 00:00:00         04\/06\/2017 14:42:23\r\napply finish time         +00 00:00:00.000     04\/06\/2017 14:42:23\r\nestimated startup time    52                   04\/06\/2017 14:42:23\r\n<\/pre>\n
Step5:<\/h4>\n
Check the data is sync by quering the tables that frequently changed on primary and standby again.<\/p>\n
 <\/p>\n
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Redo Transport to the standby has stopped after the ORA-16198 error. ERROR ORA-16198: LGWR received timedout error from KSR LGWR: Attempting destination LOG_ARCHIVE_DEST_2 network reconnect (16198) LGWR: Destination LOG_ARCHIVE_DEST_2 network reconnect abandoned Error 16198 for archive log file 4 to ‘mwstdbydb’ ORA-16198: LGWR received timedout error from KSR LGWR: Error 16198 disconnecting from destination LOG_ARCHIVE_DEST_2 …<\/p>\n
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