When a user makes a WFS connection using the Data Interoperability
extension, the connection is cached by default. This means that when
the user views the connection features, all of the features are read and
indexed, and the cache is given a 24-hour lifespan. Subsequent views of
the same connection features will be taken from the cache instead of
live from the WFS server.
In order to make use of the live non-cached WFS data, the user must
ensure that the "Numeric Identifier Attribute" field is entered.
(Connection Properties -> Parameters). This is the field name of the
primary key. When the Data Interoperability extension sees this field
populated, it turns off caching for this data and instead makes live
feature requests based on this numeric key.
The benefits of the live (dynamic) WFS requests are that changes to the
WFS data can be seen presently instead of delayed until the cache is
refreshed. The downside is that the live requests are slower,
especially when ArcObjects requests one feature at a time (such as when
viewing the attribute table or performing a Geoprocessing task.)
Thanks,
Jeff
