Database Reference
In-Depth Information
Datasets can be filtered to limit the data displayed on a report. However, it is
typically better to push the filter down into the query defined in the dataset. This
will maximize performance by only retrieving data from the source that needs to be
displayed in the report. When the filter is applied to the dataset itself, all the data
is retrieved from the data source and pulled into the dataset object, after which the
filter is applied before data is consumed by the various report items.
Report items
Report items refer to the visual items that are placed directly on the report (referred
to as the report body during authoring) that display information to the user. A report
item can be a table, chart, gauge, map, or any of a number of different items.
Just as a dataset is linked to a specific data source, a report item is linked to a specific
dataset. Looking at it from the other direction, many report items can be linked to
the same dataset just as many datasets can be linked to the same data source. The
following diagram helps you to visualize the cascading one-to-many relationship
between these primary report components:
Data source
Dataset(s)
Report item(s)
Relationship between primary report components
Report items can also be shared just like datasets and data sources. Shared report
items, referred to as report parts can be based on either a shared dataset or an
embedded dataset. When based on an embedded dataset, the dataset is wrapped
up with the shared report part as a single unit and made available to other report
developers. By creating shared report parts and reusing existing ones, the speed of
report authoring can be greatly increased.
 
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