Monday, February 3, 2020

WARNING: failed to start ASMB (connection failed) in Oracle 12c

Issue:

Starting background process ASMB
Tue Feb 04 05:25:00 2020
ASMB started with pid=37, OS id=19368
WARNING: failed to start ASMB (connection failed) state=0x1 sid=''

Cause:

RMAN CATALOG EXTREMELY SLOW WHEN MIGRATING DATABASE FROM ASM TO FILE SYSTEM
RMAN Restore/Duplicate from ASM to Non ASM in 12.1 take a longer time waiting for the ASMB process.  
Any RMAN command at the mount state which involves Non ASM location can take more time.

Solution:

Apply the patch 19503821, if not available for your version/OS then please log a SR with the support to get the patch for your version.

Ref:
WARNING: failed to start ASMB after RAC Database on ASM converted to Single Instance Non-ASM Database (Doc ID 2138520.1)

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