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These settings are available in system.merge_tree_settings and are autogenerated from ClickHouse source.

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merge_selecting_sleep_ms

Minimum time to wait before trying to select parts to merge again after no parts were selected. A lower setting will trigger selecting tasks in background_schedule_pool frequently which result in large amount of requests to zookeeper in large-scale clusters

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merge_selecting_sleep_slowdown_factor

The sleep time for merge selecting task is multiplied by this factor when there’s nothing to merge and divided when a merge was assigned
Last modified on July 23, 2026