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

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unique_key_max_encoded_size

Maximum size (in bytes) of the order-preserving binary encoding of a single UNIQUE KEY row.

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unique_key_probe_implementation

Selects the UNIQUE KEY write-path probe implementation. Currently only a single-threaded baseline exists, so auto and simple both resolve to it. Reserved: this setting has no effect yet — the value is not read until the UNIQUE KEY INSERT write path that constructs the probe is wired up. Declared now so the lever ships with the implementation.