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Transaction Volumes Graphs
transaction
A
is a basic unit of work done on a system. An interactive transaction begins when a
user presses the Enter key or a function key and ends when a reply is displayed. See "Response
Time graphs" explanations in this document for a description of transaction boundaries as they
relate to response times.
Usually, there is a correlation among:
The transaction volume in a System i partition
The organization's business volume
The response times of the transactions
PM for Power Systems in support of IBM i gives you the opportunity to monitor both transaction
rates and response times to help understand this correlation. You can make predictions that are
more accurate in capacity planning when you understand this correlation. For example, you can
use this information to help plan for future changes in business volumes if you find that a 20%
increase in business volumes leads to a 40% increase in transaction rates.
Observe changes in transaction volumes when adding new applications, or when business
volumes change significantly.
The PM for Power Systems Transaction Volumes graphs for IBM i show the interactive
transaction rates.
Available Transaction Volume graphs include:
Volume per Hour
Volume per Hour History and Three Month Trend
Transactions per Hour
Average Number of I/Os per Transaction
Processor Usage for the Average Transaction per Hour
Note: It might be necessary to do additional research using other performance analysis tools to
accurately determine the exact number of transactions being performed. This is more commonly
found with client/server workloads where, because of the application structure, PM for Power
Systems in support of IBM i cannot accurately define where each transaction starts and ends.
PM for Power Systems Graph Reference Document
65
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