Riyaj Shamsudeen has 18+ years of experience in Oracle and 17+ years as an Oracle DBA/Oracle Applications DBA. He is the principal DBA behind ora!nternals (http://www.orainternals.com - performance/recovery/EBS11i consulting company ). He specializes in RAC, performance tuning and database internals and frequently blogs about them in http://orainternals.wordpress.com. He is a proud member of OakTable network and he is an Oracle ACE too. He is a frequent presenter in major conferences such as HOTSOS, UKOUG, IOUG, RMOUG etc. He also co-authored a book with fellow Oaktable members "Expert Oracle Practices".