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FAQ: What is the recommended configuration to minimize licensing requirements for ArcSDE and ArcGIS Server?

Question

What is the recommended configuration to minimize licensing requirements for ArcSDE and ArcGIS Server?

Answer

Licensing
Prior to version 9.2, the recommended configuration for ArcSDE was that it be installed on the same server as the underlying relational database management system (RDBMS). With the licensing structure changes at version 9.2 configuration requirements change with distributed installs.

When using both ArcGIS Server and ArcSDE in a typical configuration, it is currently recommended that the ArcSDE technology (application server) be installed on the same server as the ArcGIS Server SOM and SOC components. Often, this configuration includes the Web ADF and a Web server (for example, Internet Information Services (IIS), etc.).

Note:
For definitive answers regarding licensing of ArcGIS Server components, contact an ESRI Account Representative.


Scalability: Single/Multiple Machine Deployments
The default/typical configuration for ArcGIS Server is to have all components on a single server. Installing the RDBMS on a separate server can help reduce the amount of processing completed on the server and improve performance. Client connections to the database can also be configured through use of two-tier (direct connections) to disperse the processing amongst client machines and lighten the processing load on the server.

ArcGIS Server was designed with scalability in mind. This could involve a distributed setup in which multiple servers are used and the SOM, SOC, and Web server are on different machines. For scalability and increased performance, multiple SOC machines can be used together. This configuration is a recommended way to increase performance when necessary, but requires multiple licenses for each SOC machine. Likewise, if ArcSDE is installed on its own server with the underlying RDBMS, it needs to be licensed. Installing the ArcSDE component on a SOM/SOC server removes this separate licensing requirement.

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