Today we continue discussing the best practice from storage engineering:
481) The nature of the query language determines the kind of resolving that the data virtualization needs to do. In addition, the type of storage that the virtualization layer spans also depend on the query language.
482) In order to explain the difference between data virtualization over structured and unstructured storage types, we look at metadata in structure storage. All data types used are registered. Whether they are system builtin types or user defined types, the catalog helps with the resolution.
483) A query describing the selection of entries with the help of predicates does not necessarily have to be bound to structured or unstructured query languages. Yet the convenience and universal appeal of one language may dominate another. Therefore, in such cases whether the query language is agnostic or predominantly biased, it can be modified or rewritten to suit the needs of the storage stacks described earlier.
484) Delegation doesn’t have to be the only criteria for the virtualization layer. Both the administrator and the system may maintain rules and configurations with which to locate the store for the data. More importantly the rules can be both static and dynamic. The former refers to rules that are declared ahead of the launch of the service and the service merely loads it in. The latter refers to the evaluations that dynamically assign queries to store based on classifiers and connection attributes.
481) The nature of the query language determines the kind of resolving that the data virtualization needs to do. In addition, the type of storage that the virtualization layer spans also depend on the query language.
482) In order to explain the difference between data virtualization over structured and unstructured storage types, we look at metadata in structure storage. All data types used are registered. Whether they are system builtin types or user defined types, the catalog helps with the resolution.
483) A query describing the selection of entries with the help of predicates does not necessarily have to be bound to structured or unstructured query languages. Yet the convenience and universal appeal of one language may dominate another. Therefore, in such cases whether the query language is agnostic or predominantly biased, it can be modified or rewritten to suit the needs of the storage stacks described earlier.
484) Delegation doesn’t have to be the only criteria for the virtualization layer. Both the administrator and the system may maintain rules and configurations with which to locate the store for the data. More importantly the rules can be both static and dynamic. The former refers to rules that are declared ahead of the launch of the service and the service merely loads it in. The latter refers to the evaluations that dynamically assign queries to store based on classifiers and connection attributes.
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