Reliability exercises often focus on what happens when a site or a link fails during a transaction. The 2PC Protocol Steps:
: Dividing relations into horizontal or vertical fragments and placing them across nodes.
provides structured summaries of the principles discussed in the text. 3. Alternative Practice Resources
Solution Tip: Remember that a semi-join reduces the size of the operand before it is sent across the network. If Size(Semi-join result) + Cost(Moving result) < Size(Original Table) , the semi-join is more efficient. 3. Distributed Concurrency Control
If data is initially distributed across sites and must be repartitioned: