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

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cleanup_delay_period

Minimum period to clean old queue logs, blocks hashes and parts.

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cleanup_delay_period_random_add

Add uniformly distributed value from 0 to x seconds to cleanup_delay_period to avoid thundering herd effect and subsequent DoS of ZooKeeper in case of very large number of tables.
Last modified on July 23, 2026