ClickHouse materialized views behave as AFTER INSERT triggers that fire per block, not as scheduled snapshots. Key engineering details covered: the block-level trigger model and its insert latency implications, why explicit TO syntax is mandatory, how SummingMergeTree and AggregatingMergeTree handle partial aggregations
Table of contents
The Insert Trigger ModelDesigning the Target TableThe Aggregation Gotchas You Need to KnowOperational Costs: Write Amplification, Schema Changes, BackfillingWhen to Skip ThemSort: