'Undo log' diaporamas de présentation

571 views • 56 slides

CS411 Database Systems

CS411 Database Systems. Kazuhiro Minami. 13: Logging and Recovery. Outline. Transaction Atomicity Concurrency control Recovery Logging Redo Undo Redo/undo. Users and DB Programs. End users don't see the DB directly are only vaguely aware of its design

593 views • 50 slides

Fault Tolerance in Distributed Systems

Fault Tolerance in Distributed Systems. Introduction. A fault-tolerant system masks failures, i.e. continues to operate despite failures exhibits well defined failure behavior, i.e. facilitates recovery but it may not continue operating Failure types process deaths machine crashes

917 views • 30 slides

Recovery in Main Memory Databases

Recovery in Main Memory Databases. -Le Gruenwald, Jing Huang, Margaret H. Dunham el al - Engineering Intelligent Systems, Vol.4, No. 3, September 1996 ? ?? 97/08/21. Introduction. General MMDB Architecture Main Memory (MM) in RAM memory Stable Memory(SM) optional nonvolatile memory

406 views • 24 slides

ICS 214A: Database Management Systems Fall 2002

ICS 214A: Database Management Systems Fall 2002. Lecture 17: Checkpoints Professor Chen Li. Recovery is very, very SLOW !. Undo log: First Record Last Record (1 year ago) We do not want to rescan all the log records! Some of them can be removed. Crash. Solution: Checkpoint.

363 views • 19 slides