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Vendors claim to improve Oracle optimization

 
Some vendors are claiming that the Oracle optimizer has shortcomings and are offering tools that improve the cost-based SQL optimizer (CBO) by improving costing:
 

"The main “clever thing” that ActiveKnowledge does is to assume that the optimizer doesn’t know how to calculate costs properly—indeed, that an optimizer can’t, by definition, calculate costs accurately. The company’s view is that costs can only ever be estimated and that those estimates will always include inaccuracies which, in turn, will result in queries running more slowly than would otherwise be the case.

ActiveBase contends that the only way that you can accurately calculate the costs of a query are to run the query multiple times using multiple options and actually find out in practice which is the best way to run a particular query. This is exactly what the product does: determines multiple execution strategies and then benchmarks them. For obvious reasons, therefore, the product is most suitable for environments where you have many queries that are repeated on a regular basis.

Following on from the determination of the most efficient way to run any particular query you can then derive a rule to correct the execution path, for this query (and any other queries that are similar to it) which is then activated and the improved query is passed to the database whenever this query arises."

 

 


 

 
 
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