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Oracle10g Grid Computing with RAC
Chapter 3 - High Performance and Highly Available
Database Clusters

Shared-Disk model

Disadvantages of shared disk systems are these:

  • Inter-node synchronization is required, involving complex lock management and greater dependency on high-speed interconnect.

  • If the workload is not partitioned well among the processing nodes, there may be high synchronization overhead.

  • There is operating system overhead of running shared disk software.

Other Architectures

There is another interesting architecture as provided by Microsoft SQL-Server Federated Database. SQL Server 2000 shares the database processing load across a group of servers by horizontally partitioning the SQL Server data. These SQL servers are configured and managed independently, but co-operate to process the database requests. Such a cooperative group of SQL Servers is called a federated database.

Federated database tier can achieve high levels of performance only if the application sends each SQL statement to the member server that has most of the data required by the statement. This is called co-locating the SQL statement with the data required by the statement. Thus, federation of servers presents to the applications as a single database server. However, it requires careful planning and designing a set of distributed partitioned views that spread the data across the different servers.

This configuration means significantly higher administration costs, since each individual server requires its own separate maintenance operations, and prevents access to any data if any server fails. Additionally, the performance of the complete federated database is dependent on how much of the data requested is on a local server and how much is on other servers, demanding carefully partitioning of data across the multiple servers to gain performance advantages.

Table 3.3 shows differences between Single Databases and Federated databases

For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.

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Burleson Oracle Consulting offers Senior Oracle consultants which are available for all areas of Oracle support.  Common Oracle consulting support activities include short-term Oracle tuning, Oracle database troubleshooting, Oracle9i and Oracle10g migration, Oracle9iAS App Server consulting, Oracle design reviews and Oracle requirements evaluation support. Oracle support and Oracle consulting services are priced by the hour, so you only pay for what you need. These one-time Oracle consulting services commonly include:

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