| Presentation | 1999/7/23 Controlling Database Updates in Mobile Computing Environments with Frequent Disconnection Yin-Huei Loh, Takahiro HARA, Masahiko TSUKAMOTO, Shojiro NISHIO, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | With the rapid advancement in wireless networks, mobile computing has become more and more popular. However, the limitations of mobile computers and wireless networks cause frequent disconnection among the hosts. Consequently, transactions on databases on disconnected sites cannot be executed smoothly without creating problems of inconsistency among copies of data. In this paper, we propose an algorithm to minimize this problem. Our approach chooses the appropriate method to control database udpates before disconection based on the probability that transactions occur and the duration of disconnection time between the sites. Token method enables a single site to execute transactions during disconnection, and thus ensure no conflicts between the transactions. Optimistic method lets multiple disconnected sites execute transactions simultaneously. Conflicts are checked upon reconnection and rollback of transactions is performmed if uncessary. We show the formula to choose the appropriate method depending on the situation. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | disconnected operations / database concurrency / mobile computing environments |
| Paper # | DE99-72 |
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| Conference Information | |
| Committee | DE |
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| Conference Date | 1999/7/23(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Data Engineering (DE) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Controlling Database Updates in Mobile Computing Environments with Frequent Disconnection |
| Sub Title (in English) | |
| Keyword(1) | disconnected operations |
| Keyword(2) | database concurrency |
| Keyword(3) | mobile computing environments |
| 1st Author's Name | Yin-Huei Loh |
| 1st Author's Affiliation | Information Systems Engineering, Graduate School of Engineering, Osaka University() |
| 2nd Author's Name | Takahiro HARA |
| 2nd Author's Affiliation | Information Systems Engineering, Graduate School of Engineering, Osaka University |
| 3rd Author's Name | Masahiko TSUKAMOTO |
| 3rd Author's Affiliation | Information Systems Engineering, Graduate School of Engineering, Osaka University |
| 4th Author's Name | Shojiro NISHIO |
| 4th Author's Affiliation | Information Systems Engineering, Graduate School of Engineering, Osaka University |
| Date | 1999/7/23 |
| Paper # | DE99-72 |
| Volume (vol) | vol.99 |
| Number (no) | 203 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |