154 ;;Quote: SDD-1 manages the retrieval of distributed data and the updating of shared copies

155 ;;Quote: SDD-1 supports a distributed database that expands by adding new sites and moderate-size computers

155 ;;Quote: SDD-1 does not require that every transaction use global locking to update data

156 ;;Quote: serializability only requires some serial order is equivalent to an interleaved operation

156 ;;Quote: a single transaction generates one local action followed by as many update actions as there are sites

156+;;Quote: remote updates for a transaction may be interleaved with other transactions and updates

157 ;;Quote: if need to guarantee uniqueness of timestamps in a network, require one tick between each local timestamp and qualify with siteid

157 ;;Quote: site n updates its local copy of a data item iff its local timestamp is older than the requesting transaction's timestamp

QuoteRef: bernPA5_1978 ;;157 four different protocols for different levels of synchronization; simplest depends on pipelined messages

158 ;;Quote: a site requesting an update action, waits for ACCEPT messages with later timestamps from all other sites; ensures all up-to-date

158 ;;Quote: with protocol's P2 & P3, a site broadcasts an update request; while waiting, it can process unrelated transactions

166 ;;Quote: SDD-1 assigns a transaction protocol by a protocol table that embodies a detailed analysis of how classes interfere with each other