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

Shared-Nothing Model

It does suffer from some drawbacks as well:

  • More coordination is required.
     

  • More overhead is required in terms of processing or function shipping for a SQL operation working on a data/disk belonging to another node.
     

  • Data skew is a potential problem. As data is added to the database and access patterns change, data re-partition is needed to balance IO.

Shared-Disk model

In the Shared-Disk model, all the disks containing data are accessible by all nodes of the cluster. Disk sharing architecture requires suitable lock management techniques to control the update concurrency control. Each of the nodes in the cluster has direct access to all disks on which shared data is placed.  Fig. 3.11 shows typical three node parallel database cluster. Each node has local database buffer cache. IBM Parallel Sysplex and Oracle RAC systems follow this approach of shared-disk.

Advantages of shared disk systems are as follows:

  • Shared disk systems permit high availability. All data is accessible even if one node fails.
     

  • These systems have the concept of “One Database” and multiple access points. In other words, we can say it is “multi-instance and single database”. There is no issue such as data skew as the data is located and accessed at a common location.
     

  • It provides for incremental growth of nodes and thus adds to processing power.

 

Figure 3.11 Shared Disk Parallel Database Cluster


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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