Quality of Service Indicators
Not all data sources support functions the same
way. The data modeler can set a quality of service indicator on functions
to give a visual clue about the behavior of the functions. Report
authors can use the quality of service indicators to determine which
functions to use in a report.
The quality of service indicators are:
- not available (X)
The function is not available for any data source in the package.
- limited availability (!!)
The function is not available for some data sources in the package.
- limited support (!)
The function is available for all data sources in the package but is not naturally supported for that data source. IBM® Cognos® Business Intelligence uses a local approximation for that function. Because an approximation is used, performance can be poor and the results may not be what you expect.
- unconstrained (check mark)
The function is available for all data sources.