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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/9774

Title: Improving predictability of transaction execution times in real-time databases
Authors: RASTOGI, R
SESHADRI, S
BOHANNON, P
LEINBAUGH, D
SILBERSCHATZ, A
SUDARSHAN, S
Keywords: algorithms
Issue Date: 2000
Publisher: KLUWER ACADEMIC PUBL
Citation: REAL-TIME SYSTEMS, 19(3), 283-302
Abstract: We present a design for multi-version concurrency control and recovery in a main memory database, and describe logical and physical versioning schemes that allow read-only transactions to execute without obtaining data item locks or system latches. Our schemes enable a system to provide the guarantee that updaters will never interfere with read-only transactions, and read-only transactions will not be delayed due to data contention. Consequently, transaction executions become more predictable-this partially alleviates a major problem in real-time database system (RTDBS) scheduling, namely, significant unpredictability in transaction execution times. As a result, in addition to a transaction's deadline, a more accurate estimate of its execution time can also be taken into account, thus facilitating better scheduling decisions. Our contributions include several space saving techniques for the main-memory implementation, including improved methods for logical aging of data items and the introduction of physical aging for low-level structures. Some of these schemes have been implemented on a widely-used software platform within Lucent, and the full scheme is implemented in the Dali main-memory storage manager.
URI: http://dx.doi.org/10.1023/A:1008143228351
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9774
http://hdl.handle.net/10054/9774
ISSN: 0922-6443
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