Dynamic class loading in the Java virtual machine
Proceedings of the 13th ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications
Programming the Perl DBI
Linux Journal
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The current design of database drivers -- a necessary evil for interacting with a DBMS -- imposes undue burdens on those who install, upgrade, and manage database systems and their applications. In this paper, we introduce Drivolution, a new architecture for DB drivers that reduces the cost, risk, and downtime associated with driver distribution, deployment and upgrade in large production environments. We view DB drivers as part of the DB schema, so Drivolution stores drivers in the database itself. Drivers are dynamically downloaded and installed by a small bootloader that resides within each client applications. Downloading, installing and upgrading drivers occurs transparently to applications, and existing DB management mechanisms are used to define and enforce desired security policies. We show how Drivolution can be integrated into legacy DB engines, replication middleware, and applications, without requiring changes to the server or client applications. We present several case studies that illustrate the use of Drivolution in production environments.