SESDCN control statements and options

SESDCN control statements and options parameterize the distribution component SESDCN and define distribution rules (see section “Distributed processing with SESAM/SQL DCN”).

SESDCN control statements

System administrators enter the SESDCN control statements when starting SESDCN. They enter them via the same interfaces as DBH start statements and options (see “Entering DBH start parameters”).

SESDCN control statements are entered as three SDF statements:

1. SET-DCN-OPTIONS

2. ADD-DISTRIBUTION-RULE-LIST

3. ADD-NETWORK-LINK-LIST

The first statement causes the DCN options to be read. The two subsequent statements are used to define the distribution rule. The distribution rule assigns an “access path” to each database to be accessed in the distributed-processing scenario. The access path consists of the processor name, the configuration name, the DCN name and the DBH name.

DCN options

System administrators enter the DCN options immediately after the SESDCN control statement SET-DCN-OPTIONS.

DCN options define the main characteristics of SESDCN operation. Since all DCN options are preset to defaults, system administrators need only specify those options that need to be set to something other than their respective defaults.

The following overview provides a brief description of the DCN options. For a detailed description of DBH options, see the “Database Operation” manual.

When entering DCN options via SYSDTA, ensure that the comment lines are started by “//REMARK”. The specifications “/REMARK” and “REMARK” will be interpreted as commands and this will lead to an SDF error message. Comments must not be put inside statements.

DCN-OPTION	Short description of function
ADMINISTRATOR	Assigns administrator authorization
COLDSTART	Requests a cold start.
DCN-IDENTIFICATION	Assigns a DCN name and configuration name.
REMOTE-ACCESS	Permits remote access by other computers
SESDLG-PASSWORD	Assigns a password.
SYSTEM-LIMITS	Specifies limit values for the permitted number of users and transaction applications, and defines reset criteria for transactions.

Table 61: DCN options