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How do I check archive gap on standby?
Step by Step Process to Resolve gap on the Standby database.
- Check the name and status of database.
- Check for GAP on standby.
- Check redo received on standby.
- Check redo applied on standby.
- Identify missing archive log files.
- Copy archive log files.
- Register archive log files with standby.
How do I check sync between primary standby databases?
Following command will help to check the Standby is sync with Primary Database in Oracle Dataguard Environment. select thread#, max(sequence#) “Last Standby Seq Applied” from v$archived_log val, v$database vdb where val. resetlogs_change# = vdb.
What is an archive gap?
An Archive Gap Sequence is a set of archived redo logs that could not be transmitted to the standby site. Usually, an archive gap sequence is created as the result of a network outage and the connection between the primary and the standby site is lost.
How do I manually archive log to standby?
Copy the archive logs from primary to standby (Dbvisit ARCHDEST location), rename the files and then run dbvisit to apply logs. Copy the archive logs from primary to standby (Dbvisit ARCHDEST location), use RMAN to catalog the files and then apply them using RMAN.
How can I tell if a database is standby?
On the primary database, check the last sequence that is generated. SQL> select max(sequence#) from V$archived_log; 4. On the standby database, check the last sequence that is applied….Using DGbrocker.
- Set proper ORACLE_SID, ORACLE_HOME.
- dgmgrl.
- connect /
- show configuration;
- show database ‘DB name’;
How do I copy archive logs from primary to standby ASM?
Where can I find the Archive Log gap?
Use the below query to find the applied archive log gap between primary and standby oracle database.
How to fix archive gap sequence on Physical standby databases?
Substitute the values for THREAD# LOW_SEQUENCE# and HIGH_SEQUENCE# from previous query in the following query and execute to find the location of the missing archived logs on the primary database:
Why does Oracle Database have a gap sequence?
If the LOW_SEQUENCE# is less than the HIGH_SEQUENCE# in the output, the database is having a gap sequence, and the difference in value is the number of archive logs that must be applied to resolve the gap. In the above output, the Oracle instance is three logs behind the primary database.
How to find the received sequence in Oracle standby?
To find the received sequence and applied sequence. Remember, difference value is 0 it does not mean that standby is in sync.
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