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

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automatic_parallel_replicas_min_bytes_per_replica

Threshold of bytes to read per replica to enable parallel replicas automatically (applies only when automatic_parallel_replicas_mode=1). 0 means no threshold. The total number of bytes to read is estimated based on the collected statistics.

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automatic_parallel_replicas_mode

Enable automatic switching to execution with parallel replicas based on collected statistics. Requires enable_analyzer = 1, enable_parallel_replicas != 0, parallel_replicas_local_plan = 1 and providing cluster_for_parallel_replicas. 0 - disabled, 1 - enabled, 2 - only statistics collection is enabled (switching to execution with parallel replicas is disabled).
Last modified on July 24, 2026