Nomenclator descriptive query optimization for large X.500 environments

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Abstract
Nomenclator is an architecture for providing efficient descriptive (attribute-based) naming in a large internet environment. As a test of the basic design, we have built a Nomenclator prototype that uses X.500 as its underlying data repository. X.500 SEARCH queries that previously took several minutes, can, in many cases, be answered in a matter of seconds. Our system improves descriptive query performance by trimming branches of the X.500 direetory tree from the search. These tree-trimming techniques are part of an active catalog that constrains the search space as needed during query processing. The active catalog provides information about the data distribution (meta-&ta) to constrain query processing on demand. Nomenclator caches both data (responses to querim) and meta-data (data distribution information, tree-trimming techniques, data access techniques) to speed future queries. Nomenclator relieves users of the need to understand the structure of the name space to locate objects quickly in a large, structured name environment. Nomenclator is a meta-level service that will eventually incorporate other name services in addition to X.500. Its techniques for improving performance should be generally applicable to other naming systems.

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