Checkpointing in Oracle.

Ashok Joshi, William Bridge, Juan Loaiza, Tirthankar Lahiri: Checkpointing in Oracle. VLDB 1998: 665-668
  author    = {Ashok Joshi and
               William Bridge and
               Juan Loaiza and
               Tirthankar Lahiri},
  editor    = {Ashish Gupta and
               Oded Shmueli and
               Jennifer Widom},
  title     = {Checkpointing in Oracle},
  booktitle = {VLDB'98, Proceedings of 24rd International Conference on Very
               Large Data Bases, August 24-27, 1998, New York City, New York,
  publisher = {Morgan Kaufmann},
  year      = {1998},
  isbn      = {1-55860-566-5},
  pages     = {665-668},
  ee        = {db/conf/vldb/JoshiBLL98.html},
  crossref  = {DBLP:conf/vldb/98},
  bibsource = {DBLP,}


Checkpointing is an important mechanism for limiting crash recovery times. This paper describes a new checkpointing algorithm that was implemented inOracle 8.0. This algorithm efficiently finds buffers which need to be written for checkpointing and easily scales to very large buffer cache sizes: it has been tested with buffer caches as large as six million buffers. Based on this algorithm, we have implemented a new checkpointing mechanismwhich we refer to as the incremental checkpointing mechanism. Incremental checkpoints are continuous, low overhead checkpoints that write buffers as a background activity. Incremental checkpointing is able to continuously advance the database checkpoint, i.e., the starting position in the redo log for crash recovery, resulting in dramatic improvements in recovery time while imposing minimal overhead during normal processing. The rate of buffer writes for incremental checkpointing can be controlled by the user to balance checkpoint writing overhead with recovery time requirements. In this paper, we describe the new data structures and algorithms that have been implemented for checkpointing and for incremental checkpointing in Oracle 8.0.

Copyright © 1998 by the VLDB Endowment. Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the VLDB copyright notice and the title of the publication and its date appear, and notice is given that copying is by the permission of the Very Large Data Base Endowment. To copy otherwise, or to republish, requires a fee and/or special permission from the Endowment.

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Ashish Gupta, Oded Shmueli, Jennifer Widom (Eds.): VLDB'98, Proceedings of 24rd International Conference on Very Large Data Bases, August 24-27, 1998, New York City, New York, USA. Morgan Kaufmann 1998, ISBN 1-55860-566-5
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