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Oracle optimizer may consider server workload

June 18, 2005

David Aldridge has been snooping through the US patent database and discovered an important Oracle patent regarding the workload analysis feature of it's amazing cost-based SQL optimizer.

The Oracle patent is titled "Query optimizer cost model", and it contains some fascinating features of Oracle patented optimizer workload technology:

"For example, when the workload on the DBMS is a large number of short, CPU-intensive transactions, as is typical for an on-line transaction processing (OLTP) environment, then the demand on the CPU is high, relative to the demand on the I/O system.

Thus, the optimal execution plan for OLTP is one that favors minimizing CPU usage over minimizing I/O usage.

However, when the workload is a smaller number of long, I/O-intensive transactions, as is typical for a night-time batch job processing environment (BATCH), then the demand on the CPU is low, relative to the demand on the I/O system. Thus, the optimal execution plan for BATCH processing is one that favors minimizing I/O usage over minimizing CPU usage.

Conventional cost-based optimizers will not only be inaccurate under these conditions, but they will be inaccurate in different ways at different times, as the relative costs change. These variable inaccuracies render the optimization decisions made by conventional optimizers even less useful."


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