All nodes in a multiplex configuration are secondary nodes except the
coordinator.
One secondary node acts as a designated failover node, the first choice
node to assume the coordinator role if the current coordinator is
unable to continue.
The number of secondary nodes supported depends on the license purchased,
as follows:
- Demo/Trial Edition: Unlimited secondary nodes
- Small Business Edition: None (multiplex not allowed)
- Single Application Server Edition: One secondary node
- Enterprise Edition: Unlimited secondary nodes (license needed
for each)
Secondary nodes:
Can be either read-only nodes (reader
nodes) or read-write nodes (writer nodes).
Writer nodes:
- Can run read-only and read-write operations against shared IQ
objects.
- Can manipulate local data in temporary and SA base tables.
Reader nodes:
- Can run read-only operations against shared IQ objects.
- Can manipulate local data in temporary and SA base tables.