The most appropriate mechanism to add a new set of related personal data identifiers, such as those from an Oracle database, into BlueXP classification is by creating a custom category. A custom category acts as a container to group one or more custom patterns (defined by regular expressions) that identify the specific format of the data. This category can then be easily managed and applied to scanning policies, allowing BlueXP to discover this new class of proprietary sensitive data alongside its built-in identifiers. This approach provides a structured and scalable way to extend the classification capabilities.

A. RegEx: While regular expressions (RegEx) are used to define the specific pattern of the identifier, the "custom category" is the higher-level management mechanism used to group and apply these patterns within a policy.

C. Data Fusion: This is a Google Cloud data integration service for building ETL/ELT pipelines and is not a feature within NetApp BlueXP for defining custom data identifiers for classification.

D. custom keywords: This is used for identifying specific, static words or phrases. It is generally unsuitable for database identifiers, which typically follow a variable but structured pattern best matched by RegEx.

1. NetApp BlueXP classification documentation, "Managing classification policies": This document explains the role of categories in policy management. It states, "You can create custom categories that include the built-in personal data types and your own custom patterns (regular expressions)." This highlights that the category is the primary organizational unit for new data types.

Source: https://docs.netapp.com/us-en/bluexp-classification/task-managing-policies.html (Refer to the section on "Custom categories").

2. NetApp BlueXP classification documentation, "Adding custom patterns to identify sensitive data": This document details the creation of the patterns themselves. It shows that a custom pattern (RegEx) is the foundational element, which is then logically grouped and managed via a custom category for policy application.

Source: https://docs.netapp.com/us-en/bluexp-classification/task-adding-custom-patterns.html (Refer to the introductory paragraph and procedural steps).