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The scripts for enabling or disabling case insensitive searching can be found in the dbscripts\features folder of the process-sql-store.

This script creates an index which enables case-insensitive searching through lists.
To enable this feature you should run the enable script, and furthermore set the feature toggle for case insensitive search to enabled.
Like : blueriq.process-sql-store.oracle.case-insensitive-search-enabled=true

To enable this feature for the Customer Data Service you should set the following property : blueriq.customerdata.oracle.case-insensitive-search-enabled=true

P.S. This functionality could hurt performance so use with caution.