By Svein-Olaf Hvasshovd (auth.)
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Example text
Different variants of the FCP policy which exploit the potential in the policy to a variable degree are proposed in the literature. The variant proposed in [BRG87] read latches the entire DB buffer over the checkpoint transaction lifetime, thereby imposing comparable service availability threats to soft real-time transactions as ACC checkpoint transactions. The variant proposed in [LSG+79] and [GR88] avoids this unnecessary coarse latching. The basic FCP policy is followed if each checkpoint transaction produces a begin- and an endcheckpoint log record.
2. How can (a) CPUs and (b) main memory be built to have atomic-crash semantics? (c) How can partial-amnesia-crash main memory be provided? 3. Characterise the following events in terms of failure classes: (a) Lost message. (b) Recoverable disc seek failure. (c) Pointer followed beyond NILINUL. (d) Broken disc cable. (e) A transaction responding too late. 4. 5)? Do not take the comparator into consideration. Assume no repair. (b) What is the MTIF if the mean time to repair (MTIR) is 4 hours? g.
Transaction identifier A unique transaction identifier in the context of the DB. This identifies the transaction of the logged operation. The transaction identifier tells which transaction the logged operation belongs to. 8), the transaction identifier is a unique number. 27 • Operation identifier A unique operation identifier in the context of the datamodel of the DB. The operation identifier tells which operation is executed. If the datamodel contains only one state changing DB operation, the operation identifier can be omitted.
