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• lock_order 

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Whether to enable the LOCK_ORDER tool at runtime. If lock_order  is disabled (the default), no other LOCK_ORDER system variables have any effect. If lock_order  is enabled, the other system variables configure which LOCK_ORDER features to enable. 

If lock_order  is enabled, an error is raised if the server encounters a lock-acquisition sequence that is not declared in the lock-order graph. 

• lock_order_debug_loop 

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Whether the LOCK_ORDER tool causes a debug assertion failure when it encounters a dependency that is flagged as a loop in the lock-order graph. 

• lock_order_debug_missing_arc 

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