Tru64 Unix-Oracle9i Cluster Quick Reference
This quick reference provides step-by-step instructions on setting up Oracle9i RAC to run on a Tru64 UNIX cluster.
TABLE OF CONTENTS Tru64 Unix-Oracle9i Cluster Quick Reference
Chapter 7: Oracle9i Installation
RAC Concepts
Real application clusters (RACs) available with the Oracle9 i database extend the clustering features provided in previous Oracle releases such as Oracle8 i. Oracle9 i RAC is a new architecture that provides better availability and scalability.
One significant change in Oracle9 i RAC is the full implementation of Cache Fusion, which guarantees cache coherency with multiple nodes of a cluster without incurring expensive disk I/O operations. The high-speed cluster interconnect is used to pass database blocks between the database caches of each node.
Figure 7-1: Oracle9 i RAC architecture for 2-node cluster
With this new version of Oracle several terminology differences are introduced by Oracle that more accurately describe the functionality of the product. See Table 7-1 for highlights of the new terms.
| Term | Definition |
|---|---|
| Cluster Database | A single databases accessible from multiple nodes at the same time. Unlike MPP databases, data is still available with as few as one node of the database. In Oracle8 i this was referred to as a parallel database. |
| Global Cache Service (GCS) Global Enqueue Service (GES) | The GCS and GES services handle management functions that previous Oracle releases used with a distributed lock manager (DLM). |
| Service Control (SRVCTL) | Real application clusters use a utility named srvctl to manage database instances. SRVCTL is a single interface of control that can be used to start or stop all database instances. |
| Global Services Daemon (GSD) | The GSD process communicates with SRVCTL... |
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