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Concept
Single source of truth
Summary
In information science and information technology, single source of truth (SSOT) architecture, or single point of truth (SPOT) architecture, for information systems is the practice of structuring information models and associated data schemas such that every data element is mastered (or edited) in only one place, providing data normalization to a canonical form (for example, in database normalization or content transclusion).
There are several scenarios with respect to copies and updates:
The master data is never copied and instead only references to it are stored; this means that all reads and updates go directly to the SSOT
The master data is copied but the copies are only read and only the master data is updated; if requests to read data are only made on copies, this is an instance of CQRS
The master data is copied and the copies are updated; this needs a reconciliation mechanism when there are concurrent updates
Updates on copies can be thrown out whenever a concurrent update is made on the master, so they are not considered fully committed until propagated to the master (many blockchains work that way)
Concurrent updates are merged (if an automatic merge fails, it could fall back on another strategy, which could be the previous strategy or something else like manual intervention, which most source version control systems do)
The advantages of SSOT architectures include easier prevention of mistaken inconsistencies (such as a duplicate value/copy somewhere being forgotten), and greatly simplified version control. Without a SSOT, dealing with inconsistencies
Deployment of an SSOT architecture is becoming increasingly important in enterprise settings where incorrectly linked duplicate or de-normalized data elements (a direct consequence of intentional or unintentional denormalization of any explicit data model) pose a risk for retrieval of outdated, and therefore incorrect, information. Common examples (i.e.
Official source
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