A database system lock operation method is provided that includes: acquiring, by a first processing node, a lock operand of a target lock; using, by the first processing node, the target lock to perform a lock acquiring operation on a target data object; when the lock operand meets a condition for a successful lock acquiring operation, determining, by the first processing node, that the lock acquiring operation is successful, and updating a value of a data bit that is in the lock operand and used to indicate a state of the target lock on the first processing node to a value that is used to indicate that the state of the target lock on the first processing node is lock held. Accordingly, the embodiments of the present invention further disclose a node device. The embodiments of the present invention can improve performance of a database system.