Standby DB is 30 minutes behind from Priamary DB

Hello,
Primary Standby DB monitoring check is telling that Standby database is 30 minutes behind. Please help how I can solve the issue urgently.
Bundle of thanks in advance.
DB=11.2.0.3 on RHL
Best Regards

Hello,
Apologize ...
There was no error in the standby db alert log, but in the grid control of the standby section ORA-16810 was noticed.
Standby dbs '30 minutes behind from Primary' message was both on test and prod dbs.
The problem was solved somehow, but honestly speaking I am still confused or not sure how it got solved. I tried different things in the test environment but used only 1 command in prod and that worked.
In Test environment:
- In grid control (11g), I reset DG and then verify configuration from the data guard option. DG Status was not maked with green color tick mark and Normal.
- Verify Configuration reported ORA-16810 was reported (but it is sill there even the problem is resolved)
- When reset DB didn't solved, I changed the DG option to Maximum Performance from maximum protection to try to recover things manually.
- Current log was 1870 and last applied was 1860 (usually it is 1 behind or same).
- Checked List archivelog all with rman target and list backup of archivelog all with rman catalog, the archivelog files was there if I remember correctly.
Note: The command which I think did the magic was: RESTORE ARCHIVE LOG SEQUENCE 1871 from the Primary with RMAN catalog. It seems that Standby knew that oh someone restored my missing archivelog from the Primary. Was that a great feature of 11gr2 DB?
I would be thankful if you could write how I can find from the standby throw command current log and last log applied, especially may be with rman if there are archive log missing? and if for example couple of them are missing how to resolve them.
Thanks alot.
Best Regards,
Edited by: John-MK on Apr 25, 2013 11:13 AM

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