Media Recovery Waiting for thread 1 sequence (in transit)
Dan ANov 1 2010 — edited Nov 2 2010I have rebuilt our standby database using an rman duplicate since it was missing many archive logs.
Following the duplicate, the standby is now almost in sync with the primary. Logs are shipping across but are not being applied in a timely manner. How long should it take for an archive log from the primary to be applied to the standby?
I need to know this so that a proper script can be set up to check the primary and standby. At the moment they are never exactly in sync - always one sequence number behind the primary.
Why is the standby is not applying in a timely manner?
From the alert log:
Media Recovery Waiting for thread 1 sequence 11278 (in transit)
The log seems to be "in transit" for a long time
PRIMARY:
SQL> select max (sequence#) current_seq from v$log;
CURRENT_SEQ
-----------
11278
SB:
SQL> select MAX (SEQUENCE#), APPLIED FROM V$ARCHIVED_LOG where APPLIED ='YES' GROUP BY APPLIED;
MAX(SEQUENCE#) APP
-------------- ---
11277 YES
ALERT LOG:
RFS[2]: Archived Log: '/backup/prod/log_1_11277_704816194.dbf'
Primary database is in MAXIMUM PERFORMANCE mode
Mon Nov 1 15:22:01 2010
Media Recovery Log /backup/prod/log_1_11272_704816194.dbf
Mon Nov 1 15:26:49 2010
Media Recovery Log /backup/prod/log_1_11273_704816194.dbf
Mon Nov 1 15:29:54 2010
Media Recovery Log /backup/prod/log_1_11274_704816194.dbf
Mon Nov 1 15:34:18 2010
Media Recovery Log /backup/prod/log_1_11275_704816194.dbf
Mon Nov 1 15:36:42 2010
Media Recovery Log /backup/prod/log_1_11276_704816194.dbf
Mon Nov 1 15:39:43 2010
Media Recovery Log /backup/prod/log_1_11277_704816194.dbf
Mon Nov 1 15:42:34 2010
Media Recovery Waiting for thread 1 sequence 11278 (in transit)
I should add that I understand that for the Primary and Standby to be out by one log is not cause for concern (they are applying). Its just that I wanted to script a check that would compare them both, and and the moment they are never equal - when I understand that they should be and that the logs should be applied almost immediately.
Edited by: Dan A on Nov 1, 2010 4:36 PM