Redirecting the ToolTalk Database Server

You can redirect both the database host machines and the file system partitions.

Redirecting a database host machine allows a ToolTalk client to physically access ToolTalk data from a machine that is not running a ToolTalk database server.
Redirecting a file system partition allows a ToolTalk database to logically read and write ToolTalk data from and to a read-only file system partition (for example, a CD-ROM) by physically accessing a different file system partition.

Redirecting the Host Machine

When you redirect a database host machine, a ToolTalk client can physically access ToolTalk data from a machine that is not running a ToolTalk database server. To redirect the host machine, you need to map the hostnames of the machines the ToolTalk client is to access. On the machine running the ToolTalk client that is making the database query:

Create a hostname_map file. For example:
# Map first host machine
oldhostname1 newhostname1
# Map second host machine
oldhostname2 newhostname2
where oldhostname is the name of the machine the ToolTalk client needs to access and newhostname is the name of a machine that is running the ToolTalk database server.
If you want to make changes or add types on a system-wide basis, use /etc/dt/appconfig/tttypes.
NOTE: A file defined in the TT_HOSTNAME_MAP environment variable has a higher precedence than the map in the user database.
The map file is read into a ToolTalk client when the client makes a tt_open call.

Redirecting the File System Partition

When you redirect a file system partition, a ToolTalk database can logically read and write ToolTalk data from and to a read-only file system partition by physically accessing a different file system partition. To redirect a file partition, you need to map the partitions to where the ToolTalk database will write. On the machine running the ToolTalk database server:

Create a partition_map file. For example:
# Map first partition /cdrom /usr # Map second partition /sr0/export/home /export/home
maps the read-only partition /cdrom to /usr, a read-write partition; and maps the read-only partition /sr0/export/home to /export/home, a read-write partition.
Store the map file in the same location at which the system ToolTalk Types databases are stored.
NOTE: A file partition defined in the TT_PARTITION_MAP environment variable has a higher precedence than the file partition defined in this map file.
The map file is read when the ToolTalk database server is started, or when the database receives a USR2 signal.

Redirecting the ToolTalk Database Server

Technical documentation

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Redirecting the Host Machine

Redirecting the File System Partition