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Table of contents:

Objectivity/DB - Flexible Deployment

• Introduction
• Single Logical View
• Simple Distributed Servers
• Replaceable Components
• Configuration Parameters
• Processor Power
• Data Locality
• Input/Output Capabilities
• Network Bandwidth
• Concurrency
• Caching
• Data Usage Dynamics
• System Latency
• Fault Tolerance
• Geography/Mobility
• Security
• Configuration Examples

Replaceable Components

Objectivity/DB strikes a balance between the free-for-all of open source software and traditional closed (proprietary) products by providing replaceable components in key subsystems. If the developer can run the verification suite for a replaceable component then Objectivity will provide standard support for applications that use modified or replaced components.

• The main replaceable components (shown in Figure 3, below) are:
• User defined plugins for the open source Eclipse® Integrated Development Environment - invoke Objectivity/DB database administration and schema management functionality.
• Object Oriented SQL++ server methods - used in support of SQL++ queries, e.g. to interpret “Age” as a method that must compute an age from the Date_of_Birth field in a Person object.
• Task Splitters – used by Parallel Query Engine to direct the scope of a query, e.g. to direct fragments of a query about cities in Europe to Query Agents that service each Country database.
• Filter Components – used by Query Agents to further qualify an object found using generic query predicates.
• Object Oriented File System [OOFS] – sits between a data server and the file system or specialized storage devices.
• Generalized Security Architecture [GSA] Component - used within OOFS to allow system or database administrators to control access to files.