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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Creating Efficient RAC Data Objects

This may seem perplexing, since some of the suggestions are contradictory. The correct approach depends on the specific tuning situation. In a situation where hot blocking is occurring (multiple instances want the same index block because all of the current data entries are indexed there), then randomizing the index nodes will reduce the possibility of intra-node index block pinging

This is demonstrated in Figure 13.3. In the case where the data referenced in a single index block is needed by a single instance, the number of data blocks required is reduced by concentrating the data into as few a number of data and index nodes as possible. This reduces the intra-node pinging of data blocks. This is demonstrated in Figure 13.4. So in the first case we are reducing intra-node index block pinging, in the second we are reducing the intra-node pinging of data blocks. The appropriate technique will have to be determined for each tuning situation.

Figure 13.3: Example of a Reverse Key Index    

Figure 13.4: Clustering Factor Affects

Figure 13.3 illustrates that a hot index block, such as an index containing sequential data (by date or number) that is required by multiple nodes, increases the intra-node index block pinging, as the nodes transfer the index block to perform data lookups.

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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