Administrator User Guide
AVEVA E3D™ Databases : How Databases are Updated
How Databases are Updated
Updating Model Databases
This section describes how the model databases, that is MODEL, DRAFT (PADD), ISODRAFT, Catalogue, Properties and Dictionary databases, are updated.
When an AVEVA E3D™ user adds, changes or deletes items, the changes are not immediately written into the database. New or modified items are stored in memory. If there is insufficient memory available, data may be paged out to a temporary file. When the user does a SAVEWORK, the data is written back to the end of the database. If the user changes module or exits from AVEVA E3D™ without saving work, the changes stored in memory or in the temporary file will be discarded and the effects of all commands given while in the working module since the last SAVEWORK will be lost.
A reader of a database will only see changes after:
•
the writer does a SAVEWORK, FINISH or module switch
and
•
the reader does a GETWORK or module switch. Until the reader does a GETWORK, the data will appear exactly as it was before the SAVEWORK.
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