Principles Of Distributed Database Systems Exercise Solutions

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

Silence.

Horizontal fragmentation splits a relation into subsets of tuples based on a predicate. Solution Tip: Remember that a semi-join reduces the

In a standard 2PC protocol, the Coordinator fails after sending "PREPARE" messages but before writing the final decision to the log. The participants have voted "YES" and are waiting. Why is this a problem? How does a 3-Phase Commit (3PC) solve it? Solution Tip: Remember that a semi-join reduces the

Under Basic 2PL (locks held until commit, but released earlier for reads possible in some implementations): Solution Tip: Remember that a semi-join reduces the

The storm had passed. The hull was patched. And the ledger was true.