Optimal Checkpoint Times for a Majority Database System  
Author Kenichiro Naruse

 
Co-Author(s) Toshio Nakagawa

 
Abstract The tasks with random processing times are executed successively. Two types of checkpoints can be placed at the end of tasks. We suppose several database-nodes and one management-node. Tasks are executed by the database-nodes and watch them by management-node. We consider two types of nodes that are single node and majority node. Two types of checkpoints are called Journal Checkpoint (JC) and Flush Checkpoint (FC). JC needs a small time compared with FC to store checkpoint data, and FC needs a long time compared with JC to store checkpoint data. To get quickly response from the system, we divide database data by the number of database-nodes to store. The problem is that in what places we should set suitable checkpoints and how many database-nodes we should prepare. We derive how many number of JC checkpoints between FC to minimize the execute time, and how many number of database-nodes to minimize it. The mean execution times per one task are obtained and optimal numbers that minimize them are derived analytically and numerically.

 
Keywords Reliability, Checkpoint times, Big data, Database system, Majority systems, High speed processing
   
    Article #:  19153
 
Proceedings of the 19th ISSAT International Conference on Reliability and Quality in Design
August 5-7, 2013 - Honolulu, Hawaii, U.S.A.