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In addition to the transaction coordinator, the transactional protocol defines remote nodes which are server nodes that keep a part of the data being accessed or updated inside of the transaction. Internally, every server node maintains a distributed hash table (DHT) for partitions it owns. The DHT helps to look up partition owners (primary and backups) efficiently from any cluster node including the transaction coordinator. Note, that the data itself is stored in pages that are arranged by B+Tree (refer to memory architecture documentation for more details).