The OLAP Services feature from SQL Server v7.0 is called Analysis Services in SQL Server 2000. To enable analysis services, select , click the Add-ins category, select the Microsoft Analysis Services add-in (PdMsOlap.dll), and then click OK to install it and return to the model.
For information about analysis services in SQL Server 2005, see Microsoft SQL Server 2005 Analysis Services.
Analysis Services provide the following capabilities:
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The Analysis server that manages, stores multidimensional information and serves client application requests for OLAP data. The server stores cube metadata (cube definition specifications) in a repository. Completed cubes can be stored in a variety of storage modes: multidimensional database files (MOLAP), tables in a relational database (ROLAP), or a hybrid of multidimensional database files and relational tables (HOLAP).
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A metadata repository that contains definitions of OLAP data objects such as cubes and their elements.
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The PivotTable Service, which is an OLE DB for OLAP provider that connects client applications to the Analysis server and manages offline cubes.
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An object model called Decision Support Objects (DSO), that provides support for the Analysis Manager user interface and for custom applications that manage OLAP metadata and control the server. DSO uses hierarchically arranged groups of objects to define basic elements of OLAP data. PowerDesigner creates and manipulates DSO objects to manage metadata for OLAP data.
Source data for multidimensional cubes resides in relational databases where the data has been transformed into a star or snowflake schema typically used in OLAP data warehouse systems. Analysis Services can work with many relational databases that support connections using ODBC or OLE DB.
DSO uses hierarchically arranged groups of objects to define basic elements of Analysis Services data storage, as implemented by the Analysis server:
The following table lists the mappings between the objects contained within the DSO and PowerDesigner PDM metamodels:
|
DSO Object |
PowerDesigner PDM Object |
|---|---|
|
clsDatabase |
Model (Each model corresponds to a DSO Database.) |
|
clsDataSource |
Data source |
|
ClsDatabaseDimension |
Dimension (As in the DSO model, PowerDesigner dimensions are shared among cubes.) |
|
clsCube |
Cube (Cubes managed by PowerDesigner are only local cubes.) |
|
clsCube |
Fact (A Fact corresponds to a DSO cube in order to store measures.) |
|
clsCubeMeasure |
Measure |
|
clsDatabaseDimension |
Dimension hierarchy (Each dimension hierarchy is generated as a DSO Database Dimension. Attributes of a dimension hierarchy define levels of the corresponding DatabaseDimension.) |
|
clsDatabaseLevel clsCubeLevel |
Dimension attribute (Attributes of a dimension or dimension hierarchy define levels in a database dimension.) |
|
clsCubeDimension |
Cube dimension association (In DSO, when the name of a Cube Dimension corresponds to the name of a Database Dimension, the Cube Dimension is automatically associated with the Database Dimension to be shared between cubes.) |