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ClickHouse

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Notes on the operational side of ClickHouse: how MergeTree actually behaves under write pressure, what the replication log costs, and the habits that keep hundreds of thousands of rows per second from becoming a merge storm. Start with the batching note — everything else builds on it.

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Why ClickHouse wants your inserts in batches

Every INSERT into MergeTree creates a part on disk. Feed it row-by-row and you trade write throughput for a merge storm — batch, or let async inserts batch for you.

3 min#clickhouse#performance