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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

Simple Distributed Servers

Unlike conventional DBMSs, which generally use a complex central server, Objectivity/DB uses distributed processing. The client is directly linked to a library containing the DBMS code required for manipulating the contents of a federated database. Objectivity/DB uses three types of simple server, shown in Figure 2 (below):

• There is at least one Lock Server, which helps enforce transaction semantics.
• Remote data is accessed via simple data servers that manipulate fixed size blocks (pages) of data.
• Optional query agents can execute fragments of a query on behalf of parallel scan operations or legacy applications. They may be object oriented Parallel Query Engine agents or SQL++ servers that can interpret SQL/ODBC requests.