US Patent 12079209 Checkpoints management by a memory controller

A method for managing multiple checkpoints stored in a memory unit, the method may include (a) managing a checkpoint tree, by a memory controller; the checkpoint tree comprises reference nodes and active nodes; wherein a reference node of the reference nodes holds a snapshot of a parent checkpoint taken at the time that a child checkpoint was created from the parent checkpoint; wherein an active node of the active nodes that is associated with the parent node stores changes to the parent checkpoint introduced after a creation of the active node; and wherein the parent checkpoint and the child checkpoint belong to multiple checkpoints stored in the checkpoint tree; (b) receiving access requests to access key value (KV) pairs of one or more checkpoints of the multiple checkpoints; and (c) responding to the access requests based, at least in part, on the checkpoint tree.