NDLI: Data base recovery at CMIC

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Data base recovery at CMIC

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Data base recovery at CMIC

Content Provider	ACM Digital Library
Author	Giordano, Nicholas J. Schwartz, Marvin S.
Abstract	Several techniques have been combined to provide for data base recovery at CMIC. The CMIC environment is presented first in order to identify the constraints which data base recovery must satisfy.A technique is described for updating mass-storage structures (a B-tree in this case) in such a way that all information already addressable through the mass-storage structure can always be addressed through the mass-storage structure, even while the mass-storage structure is being updated. Audit trail recovery points are defined to be records on the audit trail tape with the property that all preceeding data base updates have been written to mass storage. Because of the mass-storage updating technique, any data base update not addressable through the data base mass-storage B-tree could not have been written to mass storage. Therefore, by the definition of a recovery point, the update must have occurred after the most recent recovery point.The audit trail is always updated before the data base. In the event of a failure which does not destroy mass storage (a soft crash), the data base mass-storage allocation is recovered by a tree walk through the B-tree ("hot start"). Then any updates which occurred after the last recovery point on the audit trail are restored from the audit trail.Finally, the problem of program restart after data base recovery is discussed. The question of whether deadlock is a reasonable price to pay for data base rollback is explained, but not answered. This question will have to be addressed as more data base systems try to support concurrent transaction and batch updates, distributed data bases, or data bases shared by independent host computers.
Starting Page	33
Ending Page	42
Page Count	10
File Format	PDF
ISBN	9781450347297
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1976-06-02
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Vsam Data base recovery Reload and restore On-line data base "hot start" Leaf-first rule Program restart Transaction B-tree Soft crash Track splitting Hard crash Audit trail
Content Type	Text
Resource Type	Article

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