The document discusses techniques for handling transactions with replicated data in distributed systems, including: - One copy serializability where the effects of transactions on replicated data are the same as if performed sequentially on a single copy. - Replication schemes like read-one write-all, available copies with validation, and quorum consensus that can handle network partitions by allowing reads from any node but requiring writes to multiple nodes. - The virtual partitions scheme which combines available copies and quorum consensus by allowing transactions within a virtual partition that spans enough nodes to form read and write quorums.