Creating the GROUPS Section


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In the GROUPS section you identify each server group in your application so that the BEA Tuxedo system can route requests to the member servers of specific groups.

The GROUPS section is populated with the number of server groups required for the application. Server groups can all reside on the same site (SHM mode) or, in a distributed application, they can reside on different sites (MP mode).

Parameters in the GROUPS section implement two important aspects of distributed transaction processing:

They associate a group of servers with a particular LMID and a particular instance of a resource manager.
By allowing a second LMID to be associated with the server group, they name an alternate machine to which a group of servers can be migrated if the MIGRATE option is specified.

The following table describes the parameters in the GROUPS section.

GROUPS Section Parameters

Parameter	Description
ENVFILE	ENVFILE specifies a file that defines the environment with which all servers in the group are executed. Lines must be in the form ident=value where ident contains only underscores and/or alphanumeric characters. If the value of ENVFILE is an invalid filename, no values are added to the environment.
GRPNO (Required)	GRPNO associates a number with a particular server group. The number must be greater than 0 and less than 30,000. It must be unique among entries in the GROUPS section.
LMID (Required)	LMID identifies the machine on which the server group being defined runs. A second LMID value can be specified (separated from the first by a comma) for an alternate machine to which this server group can be migrated if the MIGRATE option has been specified. Servers in the group can be migrated if RESTART=Y to migrate is specified in the GROUPS section. The values of LMID must be the values assigned to the LMID parameter in the MACHINES section.