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What is a Single Source Of Truth?

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A single source of truth is a single point of access and modification for a data element. It requires both a normalized data model and integration such that producers and consumers of a data element all access the same copy. Single source of truth is an architectural practice and data strategy that helps to ensure that data is reliable, accurate and secured.

Data Realities

Single source of truth is a strong rule that requires data be updated and accessed from one place without any copies floating around. In practice, large organizations find this difficult to implement. For example, many commercial off-the-shelf products and cloud services have proprietary data models that are difficult to change.
It is common for architectures to take a practical approach that doesn't strictly conform to single source of truth. Master data management is one such approach that allows for multiple copies and versions of data with a single access point using techniques such as data virtualization.
Overview: Single Source Of Truth
The practice of storing each data element in one place only.
Solves the common problem of multiple versions of data that are difficult to reconcile and secure leading to operational and information security issues.
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