Attributes
You assign an attribute to a transaction in the Modifier
component.
There are three types of attributes: numeric, character, and
unevaluated formulas.
An attribute is attached to the transaction for
the duration of the transaction, but it
can be given another value at any time.
History
The transaction maintains a history of the time it has spent
traversing the network.
This history is saved in transaction attributes.
For example, when a transaction enters a queue, it records
the time it entered the queue in an attribute that
is named in the queue control panel (see Figure 2.5).
When the transaction leaves the queue,
it updates the attribute with the total time it spent in the queue.
When a transaction enters a Bucket, if the
Collect Data check box is set (see Figure 8.8),
then any attribute in its history can be is written to a SAS data set.
You have to name the attribute for which you want to save data
in the bucket control panel.
By default, the total age of the transaction is stored also a part of its history.
This is the quantity that is by default collected in Buckets.
You can access it with the attribute named "age."
It is important to note that the transaction only spends simulation time in queues and servers.
All the real time that is spent in other components and traversing
arcs do not result in passage of simulation time.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
