Duplicate Copy of Foreign Archivelogs Created in Logical Standby (Doc ID 2233869.1)

Last updated on JANUARY 17, 2023

Applies to:

Oracle Database - Enterprise Edition - Version 10.1.0.2 to 12.2.0.1 [Release 10.1 to 12.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Information in this document applies to any platform.

Symptoms

NOTE: In the images and/or the document content below, the user information and environment data used represents fictitious data from the Oracle sample schema(s), Public Documentation delivered with an Oracle database product or other training material. Any similarity to actual environments, actual persons, living or dead, is purely coincidental and not intended in any manner.

For the purposes of this document, the following fictitious environment is used as an example to describe the procedure:

Database Name: ORCL
Disk Group: +FRA

******************

Duplicate copy of Foreign Archive Logs were getting created in Logical Standby archive log destination.

When Foreign Archive Logs are deleted manually using RMAN, only the first copy gets deleted thereby maintaining the second copy indefinitely.

Only work around was to delete them manually from ASMCMD prompt.

As seen from RMAN and ASMCMD below, 2 copies of foreign archive logs were listed, but only 1 record found in the control file for each sequence.

So the auto cleanup would leave the second copy in ASM forever.

When Foreign Archive Logs are deleted manually using RMAN, only the first copy would get deleted, thereby maintaining the second copy in the ASM Disk Group indefinitely.

Only work around was to delete them manually from ASMCMD prompt.

--From RMAN

RMAN> list archivelog all completed after 'sysdate-1/360' ;

using target database control file instead of recovery catalog
List of Archived Log Copies for database with db_unique_name ORCL
=====================================================================

Key Thrd Seq S Low Time
------- ---- ------- - ---------
13880 2 1768 A 13-FEB-17
Name: +FRA/ORCL/ARCHIVELOG/2017_02_13/thread_2_seq_1768.3821.935831741

13881 2 1768 A 13-FEB-17
Name: +FRA/ORCL/ARCHIVELOG/2017_02_13/thread_2_seq_1768.1863.935831741

13882 3 1129 A 13-FEB-17
Name: +FRA/ORCL/ARCHIVELOG/2017_02_13/thread_3_seq_1129.3716.935831743

13883 3 1129 A 13-FEB-17
Name: +FRA/ORCL/ARCHIVELOG/2017_02_13/thread_3_seq_1129.1000.935831743

--From ASMCMD

ASMCMD> ls -lt

ARCHIVELOG UNPROT COARSE FEB 13 09:00:00 Y thread_3_seq_1128.2038.935831267
ARCHIVELOG UNPROT COARSE FEB 13 09:00:00 Y thread_3_seq_1128.3273.935831267
ARCHIVELOG UNPROT COARSE FEB 13 09:00:00 Y thread_3_seq_1129.1000.935831743
ARCHIVELOG UNPROT COARSE FEB 13 09:00:00 Y thread_3_seq_1129.3716.935831743

ASMCMD> pwd
+FRA/ORCL/ARCHIVELOG/2017_02_13