![]() ![]() Tabular metadata, which is structured as JSON documents, has a new command and object model definition syntax via the Tabular Model Scripting Language (TMSL). To learn more, see MS-SSAS-T SQL Server Analysis Services Tabular protocol documentation. When managing tabular objects, TOM uses the MS-SSAS-T tabular protocol, also an extension of XMLA. When managing non-tabular objects, TOM uses ASSL, the Analysis Services Scripting Language extension of XMLA. On the wire, TOM uses the XMLA protocol to communicate with the server and to manage objects. You then call Model.SaveChanges() method which understands changes made by you at fine-grained level, sending commands to the server to update only those objects that changed. You then make changes to individual metadata objects under it, such as Table or Column. ![]() Typically, you would discover the entire Model. Within this stack, updates are fine-grained, which means every metadata object, derived from the MetadataObject class under the namespace, can be individually saved to the server. In contrast, when you manage objects that are part of tabular metadata, such as Model or Table, you leverage a completely new tabular stack. Minor objects are only refresh or saved via the major object that contains them. The MajorObject class under Microsoft.AnalysisServices namespace exposes methods for Refresh and Update. Along with the legacy API is the concept of major and minor objects that provide granular descriptions of object state as discovered from the server, or when saved to the server. When you manage objects not specified in tabular metadata (such as a Server or Database), you need to leverage parts of the existing AMO stack that describe those objects. TOM is built on top of the AMO infrastructure, which also accommodates multidimensional and tabular databases at compatibility levels below 1200. The lowest level descendant of any parent object in this hierarchy is an Annotation object that can be used to optionally extend the schema as long as you provide the code to handle it. For example, the Model object contains a collection of Table objects (via the Tables property), with each Table object containing a collection of Column objects, and so on. With the exception of AttributeHierarchy, KPI, and LinguisticMetadata, each child object can be a member of a collection. Server and Database are not considered tabular because these objects can also represent a multidimensional database hosted on a server running in Multidimensional mode, or a tabular model at a lower compatibility level that does not use tabular metadata for object definitions. Tabular object model hierarchyįrom a logical perspective, all tabular objects form a tree, the root of which is a Model, descended from Database. To review the full list of programming options for tabular models, including script and query language support, see Tabular Model Programming for Compatibility Level 1200. To learn more about specific AMO/TOM classes, see Microsoft.AnalysisServices Namespace reference. ![]() See Install, distribute, and reference the Tabular Object Model () for details. Your code will need to reference both assemblies. General-purpose classes of AMO were moved to assembly. A high-level view of the object model tree, provided below, illustrates how the component parts are related.īecause TOM is an extension of AMO, all classes representing new tabular objects are implemented in a new assembly. ![]() TOM exposes native tabular metadata, such as model, tables, columns, and relationships objects. As with AMO, TOM provides a programmatic way to handle administrative functions like creating models, importing and refreshing data, and assigning roles and permissions. The Tabular Object Model (TOM) is an extension of the Analysis Management Object (AMO) client library, created to support programming scenarios for tabular models created at compatibility level 1200 and higher. SQL Server 2016 and later Analysis Services ![]()
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