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VLDB '87 Proceedings of the 13th International Conference on Very Large Data Bases
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VLDB '93 Proceedings of the 19th International Conference on Very Large Data Bases
IDEAS '00 Proceedings of the 2000 International Symposium on Database Engineering & Applications
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VLDB '99 Proceedings of the 25th International Conference on Very Large Data Bases
The LHAM log-structured history data access method
The VLDB Journal — The International Journal on Very Large Data Bases
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TCON'95 Proceedings of the USENIX 1995 Technical Conference Proceedings
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Abstract--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. In this paper, we describe, in detail, algorithms and strategies for object and log management that make support for these features possible.