Technical GlossaryData Engineering and AI Infrastructure

Merge Policy

A loading logic that defines which record should be preserved under which rule when incoming and existing records conflict.

A merge policy determines how data conflicts are resolved during ETL and ELT processing. Rules such as latest update wins, most trusted source wins, or field-level merging are typical parts of this policy. In multi-source data integration, incorrectly designed merge logic can create silent data corruption. For that reason, merge policy is a critical bridge between data quality and business rules.

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ETL

A classic data integration approach in which data is extracted from source systems, transformed, and then loaded into a target analytical environment.

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ELT

A modern approach in which data is loaded into the target platform first, and transformations are performed later inside the storage or compute layer.

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Reverse ETL

An integration approach that moves curated data from analytics platforms back into operational systems.

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Merge Policy

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