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LNS Programmer's Guide

Performance Enhancements

For Turbo Edition, numerous internal changes have been made that will significantly

improve the speed, performance and stability of most LNS applications. This includes

improved internal use of transactions, locking and indexing for faster database

operations.

Internal indexing in some of the major LNS collections has been vastly improved, so the

time required to access items from these collections has been reduced from a linear-time

operation (varying with respect to the size of the collection) to a relatively small,

constant-time operation. For large networks with large databases, this will make for a

noticeable performance improvement when you use the Item property, the

ItemByHandle() method, the ItemByIndex() method, or the

ItemByProgrammaticName() method to retrieve an object from the following

collections:

• AppDevices Collection (when accessed through Subsystem object)

• NetworkVariables Collection

• ConfigProperties Collection

• LonMarkObjects Collection

• MessageTags Collection

• Routers Collection

The introduction of temporary monitor sets in Turbo Edition will improve the

performance of your monitor and control applications. Temporary monitor sets serve the

same purpose as the permanent monitor sets that were introduced in Release 3.0.

However, temporary monitor sets are not stored in the LNS database. As a result, it

takes considerably less time to create temporary monitor sets than it does to create

permanent monitor sets. Temporary monitor sets can only be used in a single client

session by the client application that created them. In contrast, permanent monitor sets

can be used by multiple clients in multiple client sessions. If you are creating a monitor

and control application that does not need to re-use monitor sets and monitor points, you

can maximize your application’s performance by using temporary monitor sets. For more

information on temporary monitor sets, see the next section, New Features.

New Features

This section describes the major features that have been added to LNS for Turbo Edition.

This includes the following topics:

• Enhanced Data Formatting

• Changeable Network Variable Types

• Improved Support for Dynamic Interfaces

• Improved Monitoring Performance

• Availability of Network Resource Information

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Echelon LNS Manual de usuario Pagina 20