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How To Control # Of ASM Copy Channels When Create PDB From Another PDB (Pluggable database) (Doc ID 1988108.1)

Last updated on JULY 22, 2021

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 to 12.2.0.1 [Release 12.1 to 12.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

Environment
-------------
4 DB nodes
Oracle Database 12c 12.1.0.2.0

Customer is creating a PDB from another PDB when parallel_degree_policy is AUTO is using 40 ASM copy channels at the same time, for larger datafiles it is impacting system performance. When parallel_degree_policy is manual the copy is serial and very slow. 


How can we control the number of channels?

Changes

 

Cause

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