Tabular Editor is a tool that lets you easily manipulate and manage measures, calculated columns, display folders, perspectives and translations in Analysis Services Tabular and Power BI XMLA Models (from Compatibility Level 1200 and onwards).
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With Power BI Desktop, there are two ways you can connect to and get data from your SQL Server Analysis Services tabular models: Explore by using a live connection or select items and import them into Power BI Desktop.
Let’s take a closer look.
Explore by using a live connection: When using a live connection, items in your tabular model or perspective, like tables, columns, and measures appear in your Power BI Desktop Fields pane list. You can use Power BI Desktop’s advanced visualization and report tools to explore your tabular model in new, highly interactive ways.
When connecting live, no data from the tabular model is imported into Power BI Desktop. Each time you interact with a visualization, Power BI Desktop queries the tabular model and calculates the results you see. You’re always looking at the latest data that is available in the tabular model, either from the last processing time, or from DirectQuery tables available in the tabular model.
Keep in mind that tabular models are highly secure. Items that appear in Power BI Desktop depend on your permissions for the tabular model you’re connected to.
When you’ve created dynamic reports in Power BI Desktop, you can share them by publishing to your Power BI site. When you publish a Power BI Desktop file with a live connection to a tabular model to your Power BI site, an on-premises data gateway must be installed and configured by an administrator. To learn more, see On-premises data gateway.
Select items and import into Power BI Desktop: When you connect with this option, you can select items like tables, columns, and measures in your tabular model or perspective and load them into a Power BI Desktop model. Use Power BI Desktop’s Power Query Editor to further shape what you want and its modeling features to further model the data. Because no live connection between Power BI Desktop and the tabular model is maintained, you can then explore your Power BI Desktop model offline or publish to your Power BI site.
To connect to a tabular model
In Power BI Desktop, on the Home tab, select Get Data > More > Database.
Select SQL Server Analysis Services database, and then select Connect.
In the SQL Server Analysis Services database window, enter the Server name, choose a connection mode, and then select OK.
This step in the Navigator window depends on the connection mode you selected:
If you’re connecting live, select a tabular model or perspective.
If you chose to select items and get data, select a tabular model or perspective, and then select a particular table or column to load. To shape your data before loading, select Edit Queries to open Power Query Editor. When you’re ready, select Load to import the data into Power BI Desktop.
Frequently asked questions
Question: Do I need an on-premises data gateway?
Answer: It depends. If you use Power BI Desktop to connect live to a tabular model, but have no intention to publish to your Power BI site, you don't need a gateway. On the other hand, if you do intend on publishing to your Power BI site, a data gateway is necessary to ensure secure communication between the Power BI service and your on-premises Analysis Services server. Be sure to talk to your Analysis Services server administrator before installing a data gateway.
If you choose to select items and get data, you import tabular model data directly into your Power BI Desktop file, so no gateway is necessary.
Question: What’s the difference between connecting live to a tabular model from the Power BI service versus connecting live from Power BI Desktop?
Answer: When connecting live to a tabular model from your site in the Power BI service to an Analysis Services database on-premises in your organization, an on-premises data gateway is required to secure communications between them. When connecting live to a tabular model from Power BI Desktop, a gateway isn't required because the Power BI Desktop and the Analysis Services server you’re connecting to are both running on-premises in your organization. However, if you publish your Power BI Desktop file to your Power BI site, a gateway is required.
Question: If I created a live connection, can I connect to another data source in the same Power BI Desktop file?
Answer: No. You can't explore live data and connect to another type of data source in the same file. If you’ve already imported data or connected to a different data source in a Power BI Desktop file, you need to create a new file to explore live.
Question: If I created a live connection, can I edit the model or query in Power BI Desktop?
Answer: You can create report level measures in the Power BI Desktop, but all other query and modeling features are disabled when exploring live data.
Question: If I created a live connection, is it secure?
Answer: Yes. Your current Windows credentials are used to connect to the Analysis Services server. You can't use basic or stored credentials in either the Power BI service or Power BI Desktop when exploring live.
Question: In Navigator, I see a model and a perspective. What’s the difference?
Answer: A perspective is a particular view of a tabular model. It might include only particular tables, columns, or measures depending on a unique data analysis need. A tabular model always contains at least one perspective, which could include everything in the model. If you’re unsure which perspective you should select, check with your administrator.
Question: Are there any features of Analysis Services that change the way Power BI behaves?
Answer: Yes. Depending on the features your Tabular model uses, the experience in Power BI Desktop might change. Some examples include:
You may see measures in the model grouped together at the top of the Fields pane list rather than in tables alongside columns. Don't worry, you can still use them as normal, it's just easier to find them this way.
If the tabular model has calculation groups defined, you can use them only in conjunction with model measures and not with implicit measures you create by adding numeric fields to a visual. The model might also have had the DiscourageImplicitMeasures flag set manually, which has the same effect. To learn more, see Calculation groups in Analysis Services.
To change the server name after initial connection
After you create a Power BI Desktop file with an explore live connection, there might be some cases where you want to switch the connection to a different server. For example, if you created your Power BI Desktop file when connecting to a development server, and before publishing to the Power BI service, you want to switch the connection to production server.
To change the server name:
Select Transform data > Data source settings from the Home tab.
In the SQL Server Analysis Services database window, enter the new Server name, and then select OK.
Download Tabular Editor
Troubleshooting
The following list describes all known issues when connecting to SQL Server Analysis Services (SSAS) or Azure Analysis Services:
- Error: Couldn't load model schema: This error usually occurs when the user connecting to Analysis Services doesn't have access to the database/model.
Tabular Data Stream (TDS) is an application layerprotocol used to transfer data between a database server and a client. It was initially designed and developed by Sybase Inc. for their Sybase SQL Serverrelational database engine in 1984, and later by Microsoft in Microsoft SQL Server.
History[edit]
During the early development of Sybase SQL Server, the developers at Sybase perceived the lack of a commonly accepted application level protocol to transfer data between a database server and its client. In order to encourage the use of its products, Sybase promoted the use of a flexible pair of libraries, called netlib and db-lib, to implement standard SQL. A further library was included in order to implement 'Bulk Copy' called blk. While netlib's job is to ferry data between the two computers through the underlying network protocol, db-lib provides an API to the client program, and communicates with the server via netlib. db-lib sends to the server a structured stream of bytes meant for tables of data, hence a Tabular Data Stream. blk provides, like db-lib, an API to the client programs and communicates with the server via netlib.
In 1990 Sybase entered into a technology-sharing agreement with Microsoft which resulted in Microsoft marketing its own SQL Server — Microsoft SQL Server — based on Sybase's code. Microsoft kept the db-lib API and added ODBC. (Microsoft has since added additional APIs.) At about the same time, Sybase introduced a more powerful successor to db-lib, called ct-lib, and called the pair Open Client. db-lib, though officially deprecated, remains in widespread[quantify] use.
The TDS protocol comes in several varieties, most of which had not been openly documented because they were regarded[by whom?] as proprietary technology. The exception was TDS 5.0, used exclusively by Sybase, for which documentation is available from Sybase.[1] This situation changed when Microsoft published the TDS specification in 2008,[2] as part of the Open Specification Promise.
Tabular Integration
The FreeTDS team has developed a free native-library implementation of the TDS protocol,[3] licensed under the LGPL license. WireShark has a protocol decoder for TDS.[4]
Tabular Format
Oracle Corporation provides Oracle Net - software analogous to TDS.[5]
Tabular Crystal Habit
References[edit]
- ^'TDS 5.0 Functional Specification, Version 3.8'(PDF). Retrieved 2009-07-08.CS1 maint: discouraged parameter (link)
- ^'[MS-TDS]: Tabular Data Stream Protocol'. Retrieved 2014-04-29.CS1 maint: discouraged parameter (link)
- ^Chip Andrews; David Litchfield; Bill Grindlay (2003). SQL server security. McGraw-Hill Professional. p. 260. ISBN0-07-222515-7.
- ^protocol/tds, Wireshark.org wiki
- ^'SQL Server Integration Services with Oracle Database 10g'. SQL Server Technical Article. Microsoft. May 2008. p. 2. Retrieved 2017-07-20.
Oracle Net is analogous to the SQL Server Tabular Data Stream (TDS) transport facility.
Tabular
External links[edit]
Tabular Form
- Microsoft Developer Network, Tabular Data Stream Protocol Specification
- What is TDS?, sybase.com
- TinyTDS, Ruby bindings to FreeTDS.
- jTDS, a pure-Java JDBC driver for TDS databases
- jBCP, an extension of jTDS to include BCP protocols
- United States Patent 7318075: Enhanced tabular data stream protocol, Microsoft
- Patent: TRANSPORTING TABLE VALUED PARAMETER OVER TABULAR DATA STREAM PROTOCOL, Microsoft
- Patent application: COMPRESSING NULL COLUMNS IN ROWS OF THE TABULAR DATA STREAM PROTOCOL, Microsoft