Update the Configuration File for Db2 Region and Cross-Region Databases

Attention: This feature is in Early Adopter Product (EAP) release status. We will continue the development of additional features and provide additional interfaces via patch updates and future releases. Please contact Micro Focus SupportLine if you require further clarification.

Use these steps to create or update a configuration file to include entries to one or more region databases, and a cross-region databases.

You should only create or update a configuration file using the dbfhconfig command line utility.

Open an command prompt.
Set the MFDBFH_CONFIG environment variable to locate the configuration file to be created or updated:
```
set MFDBFH_CONFIG=<location-and-name-of-file>
```
If you do not set this variable, a file named MFDBFH.cfg is assumed to be located in the current directory.

Note: The MFDBFH_SCRIPT_DIR environment variable is also required to point to the stored procedures used to interact with a datastore; however, this variable is implicitly set already when using an command prompt.
Add a database server instance that you intend to connect to:
```
dbfhconfig -add -server:<server-name> -provider:db2
```
where <server-name> is the name of the database server instance. An entry of localhost:<port> is also valid, which defaults to your machine name. If you have already updated the configuration file with the Db2 datastores, this entry will already exist, and you will receive a message informing you of this; you can skip to the next step.

Now specify the required databases within the instance.
Repeat the following step for each required region database:
```
dbfhconfig -add -server:<server-name> -dsn:<dsn-name> [-db:<existing-db>] -type:region -name:<region-name> -feature:<options> [-user:<user-name>] [-password:<password>] [-connect:<connection-string>]
```
where <dsn-name> is either the ODBC data source for the region database, or if you are using a connection string (instead of an ODBC data source), it is a unique name within the Db2 configuration in which to reference the datastore; <existing-db> (which is optional) is the name of an existing database in which to store the datastore - if this option is omitted, a new database is created; <region-name> is the name of the enterprise server region; <opts> are the optimizations to be applied to I/O operations; <user-name> and <password> are valid credentials for the instance - you do not need to specify theses if you are using a connection string; and <connection-string> is the database connection string if you are establishing a database connection without the use of an ODBC data source - see Database Connection Strings for the database-specific syntax.
<opts> can be one or more of:
- all - all available region features enabled (default).
- none - no region features enabled.
- [+|-]reslocking - enables\disables database resource locking.
Now add a reference to a single cross-region database:
```
dbfhconfig -add -server:<server-name> -dsn:<dsn-name> -type:crossregion [-user:<user-name>] [-password:<password>] [-connect:<connection-string>]  
```
where <dsn-name> is either the ODBC data source for the cross-region database, or if you are using a connection string (instead of an ODBC data source), it is a unique name within the Db2 configuration in which to reference the datastore.

Example configuration file

The following is an example of a configuration file that contains a datastore, a region database, and a cross-region database, using direct connection syntax. As the login credentials are required to establish a connection to this database, the secrets vault has also been enabled: see Configure a Secrets Vault for the Micro Focus Database File Handler for more information.

<datastores usevault="true">
   <server name="localhost:50000" type="db2" access="odbc">
      <dsn name="DB2.VSAM" type="datastore" dsname="VSAM" optio="none +ooseq" dbname="MYMFFILS" connect="$$vault$$"/>
      <dsn name="DB2.SEQ" type="datastore" dsname="VSAM" optio="none +ooseq" bitism:"32" userid="db2admin" password="$$vault$$"/>
      <dsn name="DB2.ESDEMO" type="region.cas" region="ESDEMO" feature="all" dbname="MYMFFILS" connect="$$vault$$"/>
      <dsn name="DB2.CROSSREGION" type="crossregion.cas" dsname="$XREGN$" dbname="MYMFFILS" connect="$$vault$$"/>
   </server>
</datastores>

Next, you must create the region and cross-region databases using the dbfhadmin command line utility.