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This seminar presents an alternative view of RAC scalability issues by investigating the messages exchanged between instances across the private network (interconnect).
Following a brief introduction to RAC concepts we will examine how Global Cache Services (GCS) implements Cache Fusion by managing block locking and consistency across the cluster. For each of the main GCS wait events we will drill down to the individual UDP messages that are exchanged by the instances involved in the operation. We will also look at packet size, SCN synchronization and consider situations in which engineering instance affinity and dynamic resource mastering can be beneficial.
Finally we will look at a couple of Oracle 11g enhancements to the Cache Fusion algorithm and evaluate their potential impact on performance.
Julian Dyke is an independent consultant specializing in Oracle databases. He has over 20 years of database experience including 18 years as an Oracle DBA, developer and consultant. His main areas of interest are Oracle performance, clustering and high availability. He is Chair of the UKOUG RAC & HA SIG and co-author of Pro Oracle 10g RAC on Linux. He also maintains www.juliandyke.com which specializes in Oracle diagnostics, optimization and internals.
He regularly presents at conferences, seminars and user group meetings in the UK, Europe, USA and Asia..
Maria Girone