In planning for database generation, you choose two names for your database.
These names are specified in the DBNAME directory. In this directory, the mapped DBNAME is mapped to the basic DBNAME. Details regarding this directory can be found in Setting Up the DBNAME Directory.
When the application server is started, you must supply the mapped DBNAME. This value is now the server name, and is stored in the CURRENT SERVER register.
Attention: The mapped DBNAME is the name the application requesters should specify when connecting to the application server.
The mapped DBNAME must be from one to 18 characters. It should start with an uppercase alphabetic character. The remaining characters can be alphabetic, numeric or underscore characters. The mapped DBNAME must not be prefixed with "SYSARI". It should be unique within a set of networks that are interconnected, and be defined and stored in the DBNAME directory in the production library.
The basic DBNAME has a length of eight alphanumeric characters, and must be unique within the VSE system because it is used to identify the application server subsystem to the VSE system. The basic DBNAME is either the VSE APPLID (SYSARI0x) or, in the case of guest sharing, the VM resource identifier (RESID). There are 36 reserved basic DBNAMEs (SYSARI00 to SYSARI09, SYSARI0A to SYSARI0Z), which must be reserved for VSE application servers only. If the basic DBNAME is not prefixed with "SYSARI", it is assumed to be a VM application server and must be defined with a SET APPCVM TARGET command if it is on a remote system. In this case, the basic DBNAME defined in the DBNAME directory must be identical to the VM RESID.
You must also decide whether the application server will be accessed from remote application requesters. If the DRDA environment will be used, you must also choose a CICS transaction program name (TPN) to represent the application server.
| Note: | When using remote access, it is recommended that the system administrator ensure that server names are unique within a set of interconnected SNA networks. APPLIDs are predetermined. For more information on these requirements, see Chapter 14, Using a DRDA Environment. |