When a partition is migrated to a new active node all objects in the partition must be write locked on both the new and old active nodes, and all replica nodes. This ensures that the objects are not modified as they are migrated to the new node.

When an object is copied to a new node, either because the active node is changing, or a replica node changed, a write lock is taken on the current active node and a write lock is taken on the replica node. This ensures that the object is not modified during the copy operation.

To minimize the amount of locking during an object migration, separate transactions are used to perform the remote copy operations. The number of objects copied in a single transaction is controlled by the objects locked per transaction partition property. Minimizing the number of objects locked in a single transaction during object migration minimizes application lock contention with the object locking required by object migration.