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Introduction

By having very large database, problems arrive for the user when he tries to find information. Where is it? The user must know such things as

• What information is available
• What fields are named
• Where they are located
• Data types and format
• Relationship between the data or tables
• Where the is the data source
• How current is the data
• etc

Availability

Data can be made availability be using any or all of the following 

• Metadata
• Directory Services
• Indexing of Information

Metadata

The metadata is a database about the data in the database. 

• Schema. The schema contains definitions of all object classes and attributes that you can store in the directory. 
• Object Identifiers (OIDs). Are identification numbers that are assigns to each object lcass and attribute. 

Directory Services

Directory services offer the user the ability to find and access information that he needs. This information may be ….diseases, costs, …. Each of these objects has a set of unique properties or attributes that distinguish it from other objects in the database.

Requirements:

• A single point of administration

• A single point of entry

• A scalable database

• A method to query objects

• Accessible by multi-platform types 

•  Schema definition

•  A set of rules that define the way that objects in the directory are described and defined.

•  Ability to create new objects within the existing structure

Examples

• Global Catalog. A searchable index that enables users to locate network objects without needing to know their locations. 

Indexing

Indexing is the indexing of all words in a database. Typical "search engines" use indexing.  

Standards

X.500

LDAP (Lightweight Directory Access Protocol) 

A protocol based on the X.500 protocol but is more efficient and widely implemented. 

Links

Data Dictionaries: An Overview by Philip G. Duffy

Additional links can be viewed by accessing Microsoft's Software Developers Network: http://msdn.microsoft.com

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