More than 30 years of designing, consulting, and programming experience, with emphasis on the measurement, analysis and evaluation of computer system performance, primarily in Unix/Linux environments. Most work has revolved around optimizing the interactions between the hardware, operating systems, database systems, storage subsystems and file systems. In the past the primary database focus has been with Oracle, with particular emphasis on database internals, SQL optimization, physical storage layout, and application troubleshooting in both OLTP and OLAP environments. Have also worked with Sybase ASE, SybaseIQ, ParAccel, SQLServer and PostgreSQL. Over the course of the past year and a half I've switched from working with relational databases to graph databases.