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The vagabond approach to logging and recovery in transaction-time temporal object database systems

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1 Author(s)
Norvag, K. ; Dept. of Comput. & Inf. Sci., Norwegian Univ. of Sci. & Technol., Trondheim, Norway

In most current database systems, data is updated in-place. In order to support recovery and increase performance, write-ahead logging is used. This logging defers the in-place updates. However, sooner or later, the updates have to be applied to the database. Even if this is done as a batch operation, it can result in many nonsequential writes. In order to avoid this, another approach is to eliminate the database completely and use a log-only approach. In this case, the log is written contiguously to the disk, in a no-overwrite way using large blocks. When using the log-only approach keeping previous versions comes almost for free, and this approach is therefore particularly interesting for transaction-time temporal object database systems. Although the log-only approach in its basic form is relatively straightforward, it is not trivial to support features such as steal/no-force buffer management, fuzzy checkpointing, and fast commit. We describe, in detail, algorithms and strategies for object and log management that make support for these features possible.

Published in:

Knowledge and Data Engineering, IEEE Transactions on  (Volume:16 ,  Issue: 4 )

Date of Publication:

April 2004

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