CLUSTER DELTA PUSH

Methods and apparatuses for providing access to data in a cluster database are described. Embodiments of the invention include identifying situations in which many nodes require relatively equal access to a data block, and taking appropriate measures to improve the performance of the system in these situations. For example, a node may automatically downgrade its lock from an X lock to an S lock as soon as it has finished a modification of the data. S locks are sent to other nodes in the system as soon as a modification is complete. Modifications to the data are also sent to other nodes in the system as soon as a modification is complete. Depending on the size of the data modification, the entire data block may be sent, or only the modifications to the data may be sent.