Oracle Data Masking Clarification

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Hi I am looking at the possibility of implementing the Oracle Data Masking Package but require some clarification. I am looking to mask just my non-production data. In the process of doing this does Oracle create clones of the the database? I am hoping to mask the PII data without creating a clone/ needing to create additional Oracle users. Does the Oracle solution meet these requirements? I am being told that deploying ODM, it will require application changes? Can anyone elaborate on this. My apologies I am extremely new to the DB world. Are there any other data masking solutions anyone can recommend?

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Which version of Oracle you are using ? Do you have advanced security License ?

You can make use of Redaction features as part of Advanced security available from 12.1. Oracle provides DBMS_REDACT to hide values after execution of queries i.e. only when they are displayed at screen and hence dont impact performance of any dependencies.

There are multiple options available with full/partial redaction.

Let me know if you require any more details, I have recently implemented it in production environment to protect PII DATA

Official documentation