Database Recovery by Vijay Kumar, Sang H. Son (auth.)

By Vijay Kumar, Sang H. Son (auth.)

Database Recovery offers an in-depth dialogue on all points of database restoration. to start with, it introduces the subject informally to set the intuitive figuring out, after which offers a proper remedy of restoration mechanism. some time past, restoration has been handled in basic terms as a mechanism that is carried out on an ad-hoc foundation. This publication elevates the restoration from a mechanism to an idea, and provides its crucial houses. A publication on restoration is incomplete if it doesn't current how restoration is practiced in advertisement structures. This ebook, hence, provides a close description of restoration mechanisms as carried out on Informix, OpenIngres, Oracle, and Sybase advertisement database structures.
Database Recovery is acceptable as a textbook for a graduate-level path on database restoration, as a secondary textual content for a graduate-level path on database structures, and as a reference for researchers and practitioners in industry.

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Undo. } else do not undo {LSN(Oj) < LSN(log) {This indicates that OJ does not contain the update as} {recorded in the log,} end {read} Redo. } else ignore this record {This indicates that OJ has the update (LSN(Oi) = LSN(log))} {or contain updates indicated by LSN(log) (LSN( Oi) > LSN(log))} 36 Physical Logging. In physical logging, which is also referred to as value logging, actual values of BFIM and AFIM of OJ is recorded in the log. If OJ is a page, then usually the BFIM and AFIM of OJ is physically created, thus a page of data item end up occupying two log pages.

The following two rules specify the situations for using these rules. Redo Rule. This rule indicates that all AFIMs of Oi's must be saved in the stable storage, which can either be in the stable log or in the disk database before the transaction can commit. The redo rule ensures that if a transaction that was marked as "ready to commit" but could not because of a system failure must have saved its execution history in a stable store. The writing of AFIMs could have happened in RECOVERY APPROACHES 37 any way (deferred or immediate), but as long as its complete execution history is at a safe place, it only needs a redo during recovery.

Notice that this specification of NO-STEAL does not impose an ordering or logging strategy; nor does it say how to record that a transaction is considered committed. FORCE prescribes that updated objects must be in the persistent database for a transaction to commit. Formally: VV(O) E prejix(C(O»)Ve E V(O)(commit(t) -C(O) e)) (PT[Oj -V(O) e)). NO-FORCE '* '* Write Ahead Logging-WAL No update to the stable database can be installed before a corresponding record of the update is stored in the persistent log.

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