Multiple Connection Data Entries
If a remote instance has more than one Communications Server or can be accessed by more than one network protocol, that information can be included in the vnode definition by adding another connection data entry. This allows you to distribute the load of communications processing and increase fault tolerance.
Note: When more than one Communications Server listen address is defined for a given vnode, Ingres Net automatically tries each server in random order until it finds one that is available. Similarly, when a connection fails over one network protocol, Ingres Net automatically attempts the connection over any other protocol that has been defined.
End users can create private connection data for an existing vnode by adding an entry to the Connection Data table. For the user who creates it, a private connection data entry overrides a global connection data entry defined to the same vnode. In other words, Ingres Net uses the private connection data entry whenever the user who created the entry uses the vnode.
You need the following information before adding a connection data entry:
• The network address of the node on which the remote instance resides
• The listen address of the remote instance’s Communications Server. (For the correct listen address format for your network protocol, see the appropriate appendix or check the Configure Net Server Protocols screen in the Configuration-By-Forms utility on the remote instance.)
• The keyword for the network protocol that is used to make the connection.