Server Variables

Server variables are a type of persistent variable. Server variables are specific to the server on which they are created and are stored in that server's random-access memory (RAM) memory.

As with our other variables types that are stored in memory, creating or reading server variables from memory can lead to memory corruption and server instability. To access server variables, you should properly apply a CFLOCK tag around the variable access.

As mentioned, server variables are persistent, but they are also specific to the server on which they are set and exist until the ColdFusion Server is restarted, unless they are specifically deleted from the structure.

To access the server structure, use the CFDUMP tag, as follows:

 <cfdump var="#server#"> 

There are different predefined server variables that refer to the ColdFusion installation on the server and to the server's OS. They are listed in Table 8.2.

Table 8.2. Predefined Server Variables

Variable Name	Description
Server.ColdFusion.Expiration	Empty if ColdFusion is a nonexpiring version. Contains an expiration date/time if it is an expiring license.
Server.ColdFusion.ProductLevel	Description of product license; Enterprise, Professional, or Developer.
Server.ColdFusion.ProductName	Name of ColdFusion product.
Server.ColdFusion.RootDir	Product installation directory.
Server.ColdFusion.SerialNumber	Serial number of the ColdFusion installation.
Server.ColdFusion.SupportedLocales	Comma-delimited list of languages supported by the current ColdFusion installation.
Server.OS.AdditionalInformation	Additional information about the OS installation.
Server.OS.Arch	OS architectural model.
Server.OS.BuildNumber	Build number of the OS installation.
Server.OS.Name	Name of the OS installation.
Server.OS.Version	OS installation version number.