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spfile parameter family:dw_helper.instance_mode='read-only' in 19.17 OCI DBCS Database

i am seeing this parameter family:dw_helper.instance_mode='read-only' in Database SPFILE while database instance_mode parameter shows READ-WRITE , i tried to get info from metalink but no documentation available .

could you help me understand usage of this parameter family:dw_helper.instance_mode='read-only'


Oracle Database 19c EE Extreme Perf Release 19.0.0.0.0 - Production

Version 19.17.0.0.0


SQL> show parameter instance_mode


NAME                 TYPE    VALUE

------------------------------------ ----------- ------------------------------

instance_mode            string   READ-WRITE

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