Niagara Browser Access Guide

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Niagara Browser Access Guide
microsoft visio tutorial

Log object Log object Log object (many logs)Station B Tstamp
Chapter 7 Application DatabaseAbout Application Database DataNiagara Release Niagara Browser Access Guide Revised: August 15, 2002 7–3

SQL Application
Database
Tstamp
older
2 1
last
Value Status
Data Buffer = n records
Log object
Log object
Log object
Station A
(many logs)
Tstamp
older
2 1
last
Value Status
Data Buffer = n records
Log object
Log object
Log object
(many logs)
Station B
Tstamp
oldest
+
+
10 9
8 7
6 5
4 3
2 1
last
Value
Status
ARCHIVE.STATION.SWID
ARCHIVE.STATION.SWID
ARCHIVE.STATION.SWID
ARCHIVE.STATION.SWID
(many archives)

Chapter 7 Application Database
About Application Database Data
Niagara Release Niagara Browser Access Guide Revised: August 15, 2002
7–3
Only logs that have archived are included in the appdb. Other logs in the system may not be configured (or commanded) to archive—only buffered log data is available.
S
TATION
A
RCHIVES
AND
APPLICATION A
RCHIVES
By default, two (2) special archives exist for each station—these are sourced from the station’s audit log and error log. They can be considered station archives The data in these two logs (and archives) looks different from other logs and archives.

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