Answer
Logical decoding reads WAL and converts changes into logical events using plugins like pgoutput or wal2json. Used for CDC, microservice event sourcing, real-time pipelines, and incremental ETL.
Quick Answer
Logical decoding decodes WAL changes into a logical stream of row-level changes (INSERT/UPDATE/DELETE). Used by: logical replication, change data capture (CDC), audit logging. Output plugins (pgoutput for built-in logical replication, wal2json for JSON output, decoderbufs for Protobuf) format the stream. Consumers (Debezium, Kafka Connect) subscribe to capture changes for downstream systems without polling.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ