Compaq Reliable Transaction Router manual A partition can also have multiple standby servers

RTR Server Types

Standby Server Configurations

Anonymous clients

Tunnel

but strictly speaking, the key range defines the partition. A partition has both a name, its partition name, and an identifier generated by RTR — the partition ID. The properties of a partition (callout, standby, shadow, concurrent, key segment range) can be defined by the system manager with a CREATE PARTITION command. For details of the command syntax, see the RTR System Manager's Manual.

A significant advantage of the partitioning shown in the bank example is that you can add more account numbers without making changes to your application; you need only add another server and disk drive for the new account numbers. For example, say you need to add account numbers from 90,000 to 99,999 to the basic configuration of Figure 1–19, Bank Partitioning Example. You can add these accounts and bring them on line easily. The system manager can change the key range with a command, for example, in an overnight operation, or you can plan to do this during scheduled maintenance.

A partition can also have multiple standby servers.

A node can be configured as a primary server for one key range and as a standby server for another key range. This helps

to distribute the work of the standby servers. Figure 1–20 illustrates this use of standbys with distributed partitioning. As shown in Figure 1–20, Application Server A is the primary server for accounts 1 to 19,999 and Application Server B is the standby for these same accounts. Application Server B is the primary for accounts 20,000 to 39,999 and Application Server A can be the standby for these same accounts (not shown in the figure). For clarity, account numbers are shown only for primary servers and one standby server.

RTR supports anonymous clients, that is, clients can be set up in a configuration using wildcarded node names.

RTR can also be used with firewall tunneling software, which supports secure internet communication for an RTR connection, either client-to-router, or router-to-backend.

1–22Introduction