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Gateway Administrator Performance Issues
Gateway Administrator Performance Issues
The Gateway administrator needs to understand the following systemperformance issues:
■
Effect of network speed on performance
■
Keeping statistical information current
Effect of Network Speed on Performance
Network factors that affect the performance of SQL queries, which transfer
data over a network from an application server to the Gateway, are described
in the following list:
■
The raw transfer rate of the network
■
The number of messages that are required to transport the data
■
The buffer sizes that the software and hardware components that are
involved in the transfer use
■
Concurrent network traffic
The Raw Transfer Rate of the Network
The raw transfer rate of a network is determined by its slowest link. A typical
Informix Gateway-to-IBM mainframe network has at least the following
links:
■
Link 1: the Informix Gateway is connected to an IBM controller.
■
Link 2: the IBM controller is connected (channel attached) to the IBM
mainframe.
Raw transfer rates for Link 1 networks range from 1,200 bits per second on a
modem to 2 megabits per second on a Token Ring. Raw transfer rates for
Link 2 networks range from 1 to 4.5 megabits per second.
Number of Messages That Are Required to Transport the Data
A fixed cost is associated with any message exchange on a distributed
network. The fewer the messages required to transport a given amount of
data, the less CPU and elapsed time is consumed.
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Informix Enterprise Gateway with DRDA User Manual