Architecture of reliable web applications software by Moh’d A. Rada deh, Hayder Al-Ameed

By Moh’d A. Rada deh, Hayder Al-Ameed

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Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. Database Hgh Avalablty: An Extended Survey  number of concurrent clients, especially in an Online Transaction Processing (OLTP) environment. Transactions running on any instance can directly read or modify any part of the database. Such systems require the use of internode communication to synchronize update activities performed from multiple nodes. , the node that has a lock on the data writes the block to the disk before the other nodes can access the same data block) (Chandrasekaran & Kehoe, 2003).

The subsequent database availability depends on the number of transactions that need to be rolled forward or rolled back. Recently, most commercial database management system providers have started to address cluster architectures using numerous approaches. While other providers use solutions offered by third-party companies with limited support for scalability and high availability (Cecchet, Marguerite, & Zwaenepoel, 2004). Copyright © 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc.

When database availability strategy cannot recover automatically, unplanned downtime occurs; this is fairly severe, because it may require IT personnel hours to restore database operations. However, IT departments with well-designed plans can recover quickly and minimize unplanned downtime to provide a relatively high level of database availability. Catastrophic downtime, the severest level of database downtime, occurs when hardware and facilities are damaged such that they cannot be repaired. Catastrophic events include hurricanes, tornados, flooding, earthquakes, fires, and explosions.

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