RMAN-08137 while Deleting Archived Logs from Standby

RMAN-08137: WARNING: archived log not deleted, needed for standby or upstream capture process happening on Physical Standby Database

Cause

In one of my Physical standby database version 12.1.0.2 the above error appeared. After spending an hour looking various RMAN setting and configuration I found that value of log_archive_dest_state_2 parameter was not enabled, which eventually caused this issue.

SQL> show parameter dest_state_2
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_state_2 string      RESET

Solution:

Enable parameter log_archive_dest_state_2

SQL> alter system set log_archive_dest_state_2=enable;
System altered.
SQL> show parameter dest_state_2
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_state_2 string      ENABLE

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