ORA-16401; ORA-16055; 16055 ERROR

Applies to: Oracle Server - Enterprise Edition - Version: 10.2.0.1 to 11.2.0.1.0 - Release: 10.2 to 11.2
Linux x86-64 Symptoms - ORA-16401 and ORA-16055 Error reported sometimes at Primary ALERT.LOG:

ARC3: Archive log rejected (thread 1 sequence 136480) at host '(DESCRIPTION=  (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.26)(PORT=1530))(CONNECT_DATA=(SERVICE_NAME=sdbinfo)(SERVER=DEDICATED)))'
Errors in file /opt/dbinfo/diag/rdbms/dbinfo/dbinfo/trace/dbinfo_arc3_7445.trc:
ORA-16401: archivelog rejected by RFS
FAL[server, ARC3]: FAL archive failed, see trace file.
Errors in file /opt/dbinfo/diag/rdbms/dbinfo/dbinfo/trace/dbinfo_arc3_7445.trc:
ORA-16055: FAL request rejected
ARCH: FAL archive failed. Archiver continuing
ORACLE Instance dbinfo - Archival Error. Archiver continuing.

- RedoLog switch happens very frequently before the above Error reported
- The requested ArchiveLog by FAL requests the current Log Sequence or the Sequence currently being archived

Changes There is no change made. Cause The Problem here is that the Primary Database is switching Logs too frequently.
Using ARCH to send the archives, every time there's a log switch the Primary has to send the Archivelog to the Standby, meanwhile another Log Switch occurred on the Primary which causes also another Archivelog to be sent to the Standby, but the first one has not finished yet, a GAP is formed and detected by the Standby. At this Time the first Archivelog is also sent as FAL Request, but this one will fail because the first one is still being archiving, locked, so the second one fails. Solution

• Ignore these Messages as long as the Standby Database keeps synchronized with the Primary
• Database Increase the Size of the Online Redologs to reduce Redolog Switch Frequency
• Increase Network Bandwith between the Primary and Standby Database