Articles by tag: materialized-views

ClickHouse Materialized Views: triggers on INSERT

How MV work in ClickHouse: incremental aggregation, chains minute→hour→day, Null+Kafka pattern, POPULATE and its dangers. Examples with SummingMergeTree and AggregatingMergeTree.

ClickHouse Materialized Views: Nuances and Solutions

How MV Works in ClickHouse? Critical Differences from Classical DBMS, UPDATE/DELETE Limitations and Best Practices. Learn How to Avoid Design Errors.

ClickHouse: deduplication and losses in MV

Analysis of data losses in ClickHouse due to block deduplication in materialized views. Settings insert_deduplicate=0 and deduplicate_blocks_in_dependent_materialized_views=1. Configure lossless storage — read the details.