Introduction to InterSystems DeepSee - InterSystems Documentation

Filters
3.3.3 Indexed Dimensions and Dynamic Dimensions
By default, dimensions are indexed. That is, when you define a dimension, an index is added to the
class that contains the property that you are using. The data in the index must be up-to-date in order
for the dimension to behave correctly.
You can also create dynamic dimensions, which are not indexed.
3.3.4 Compound Dimensions
You can create more highly aggregated dimensions based on members of existing dimensions. These
are known as compound dimensions. The definition of a compound dimension consists of the following
set of information:
• Name of the compound dimension.
• Set of members of this dimension. Each member definition consists of a member name and an
expression that selects records from the database.
For example, if you already have a Country dimension, you can create a Continent dimension. The
definition of, for example, the Europe member would be an expression that selects records for Austria,
Belgium, Denmark, and so on.
For information on expressions that select records, see the following section, “Filters.”
3.4 Filters
You use filters in the definition of pivot tables and in many other places.
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