IEICE TRANSACTIONS on Information
Controlling View Divergence of Data Freshness in a Replicated Database System Using Statistical Update Delay Estimation
Summary :
We propose a method of controlling the view divergence of data freshness when copies of sites in a replicated database are updated asynchronously. The view divergence of the replicated data freshness is the difference in the recentness of the updates reflected in the data acquired by clients. Our method accesses multiple sites and provides a client with data that reflects all the updates received by the sites. First, we define the probabilistic recentness of updates reflected in acquired data as read data freshness (RDF). The degree of RDF of data acquired by clients is the range of view divergence. Second, we propose a way to select sites in a replicated database by using the probability distribution of the update delays so that the data acquired by a client satisfies its required RDF. This way calculates the minimum number of sites in order to reduce the overhead of read transactions. Our method continues to adaptively and reliably provide data that meets the client's requirements in an environment where the delay of update propagation varies and applications' requirements change depending on the situation. Finally, we evaluate by simulation the view divergence we can control using our method. The simulation showed that our method can control the view divergence to about 1/4 that of a normal read transaction for 100 replicas. In addition, the increase in the overhead of a read transaction imposed by our method is not as much as the increase in the total number of replicas.
- Publication
- IEICE TRANSACTIONS on Information Vol.E88-D No.4 pp.739-749
- Publication Date
- 2005/04/01
- Publicized
- Online ISSN
- DOI
- 10.1093/ietisy/e88-d.4.739
- Type of Manuscript
- PAPER
- Category
- Database
Authors
Keyword
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Takao YAMASHITA, Satoshi ONO, "Controlling View Divergence of Data Freshness in a Replicated Database System Using Statistical Update Delay Estimation" in IEICE TRANSACTIONS on Information,
vol. E88-D, no. 4, pp. 739-749, April 2005, doi: 10.1093/ietisy/e88-d.4.739.
Abstract: We propose a method of controlling the view divergence of data freshness when copies of sites in a replicated database are updated asynchronously. The view divergence of the replicated data freshness is the difference in the recentness of the updates reflected in the data acquired by clients. Our method accesses multiple sites and provides a client with data that reflects all the updates received by the sites. First, we define the probabilistic recentness of updates reflected in acquired data as read data freshness (RDF). The degree of RDF of data acquired by clients is the range of view divergence. Second, we propose a way to select sites in a replicated database by using the probability distribution of the update delays so that the data acquired by a client satisfies its required RDF. This way calculates the minimum number of sites in order to reduce the overhead of read transactions. Our method continues to adaptively and reliably provide data that meets the client's requirements in an environment where the delay of update propagation varies and applications' requirements change depending on the situation. Finally, we evaluate by simulation the view divergence we can control using our method. The simulation showed that our method can control the view divergence to about 1/4 that of a normal read transaction for 100 replicas. In addition, the increase in the overhead of a read transaction imposed by our method is not as much as the increase in the total number of replicas.
URL: https://global.ieice.org/en_transactions/information/10.1093/ietisy/e88-d.4.739/_p
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@ARTICLE{e88-d_4_739,
author={Takao YAMASHITA, Satoshi ONO, },
journal={IEICE TRANSACTIONS on Information},
title={Controlling View Divergence of Data Freshness in a Replicated Database System Using Statistical Update Delay Estimation},
year={2005},
volume={E88-D},
number={4},
pages={739-749},
abstract={We propose a method of controlling the view divergence of data freshness when copies of sites in a replicated database are updated asynchronously. The view divergence of the replicated data freshness is the difference in the recentness of the updates reflected in the data acquired by clients. Our method accesses multiple sites and provides a client with data that reflects all the updates received by the sites. First, we define the probabilistic recentness of updates reflected in acquired data as read data freshness (RDF). The degree of RDF of data acquired by clients is the range of view divergence. Second, we propose a way to select sites in a replicated database by using the probability distribution of the update delays so that the data acquired by a client satisfies its required RDF. This way calculates the minimum number of sites in order to reduce the overhead of read transactions. Our method continues to adaptively and reliably provide data that meets the client's requirements in an environment where the delay of update propagation varies and applications' requirements change depending on the situation. Finally, we evaluate by simulation the view divergence we can control using our method. The simulation showed that our method can control the view divergence to about 1/4 that of a normal read transaction for 100 replicas. In addition, the increase in the overhead of a read transaction imposed by our method is not as much as the increase in the total number of replicas.},
keywords={},
doi={10.1093/ietisy/e88-d.4.739},
ISSN={},
month={April},}
Copy
TY - JOUR
TI - Controlling View Divergence of Data Freshness in a Replicated Database System Using Statistical Update Delay Estimation
T2 - IEICE TRANSACTIONS on Information
SP - 739
EP - 749
AU - Takao YAMASHITA
AU - Satoshi ONO
PY - 2005
DO - 10.1093/ietisy/e88-d.4.739
JO - IEICE TRANSACTIONS on Information
SN -
VL - E88-D
IS - 4
JA - IEICE TRANSACTIONS on Information
Y1 - April 2005
AB - We propose a method of controlling the view divergence of data freshness when copies of sites in a replicated database are updated asynchronously. The view divergence of the replicated data freshness is the difference in the recentness of the updates reflected in the data acquired by clients. Our method accesses multiple sites and provides a client with data that reflects all the updates received by the sites. First, we define the probabilistic recentness of updates reflected in acquired data as read data freshness (RDF). The degree of RDF of data acquired by clients is the range of view divergence. Second, we propose a way to select sites in a replicated database by using the probability distribution of the update delays so that the data acquired by a client satisfies its required RDF. This way calculates the minimum number of sites in order to reduce the overhead of read transactions. Our method continues to adaptively and reliably provide data that meets the client's requirements in an environment where the delay of update propagation varies and applications' requirements change depending on the situation. Finally, we evaluate by simulation the view divergence we can control using our method. The simulation showed that our method can control the view divergence to about 1/4 that of a normal read transaction for 100 replicas. In addition, the increase in the overhead of a read transaction imposed by our method is not as much as the increase in the total number of replicas.
ER -
English
