Database journaling in a multi-node environment

Details Database journaling in a multi-node environment Database journaling in a multi-node environment

2011-07-12

2011-07-12

Chen, Susan Y (Department: 2161)

Data processing: database and file management or data structures

File or database maintenance

Database archive

C707S663000, C707S664000

Reexamination Certificate

active

07979400

ABSTRACT:
A database spread over multiple nodes allows each node to store a journal recording changes made to the database and also allows a journaling component to manage the memory space available for journaling. Two threshold size values may be specified for the journal. The first threshold value specifies a journal size at which to being pruning the journal on a given node. A journal pruning algorithm may be used to identify journal entries that may be removed. For example, once a given transaction completes (i.e., commits) the journal entries related to that transaction may be pruned from the journal. The second threshold value specifies the maximum size of the journal. After reaching this size, journal entries may be written to disk instead of the in-memory journal.

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Wylie et al., “Survivable Information Storage Systems,” IEEE Computer, Aug. 2000 vol. 33(8): pp. 61-68.

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