![]() Why Build Data Cartridges? The Need to Handle Complex Data Objects ![]() Once installed, the data cartridge handles all access issues arising out of the possibility that its target users might be in different schemas, have different privileges and so on. Optimizer interfaces similarly allow data cartridges to define domain-specific ways of assessing the CPU and I/O cost of accessing cartridge data. For example, the interface to the indexing engine allows for domain-specific indexing. The Oracle Extensibility Framework defines a set of interfaces that enable data cartridges to integrate with the components of the server engine. The extensions made to the server by defining new types are integrated with the server engine so that the optimizer, query parser, indexer and other server mechanisms recognize and respond to the extensions.
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