Workspace Database (SSAS Tabular)

The tabular model workspace database, used during model authoring, is created when you create a new tabular model project in SQL Server Data Tools (SSDT). The workspace database resides in-memory on an Analysis Services instance running in Tabular mode; typically on the same computer as SQL Server Data Tools.

This topic includes the following sections:

• Workspace Database Overview

• Workspace Database Properties

• Using SSMS to Manage the Workspace Database

• Related Tasks

Workspace Database Overview

A workspace database is created on the Analysis Services instance, specified in the Workspace Server property, when you create a new Business Intelligence project by using one of the tabular model project templates in SQL Server Data Tools. Each tabular model project will have its own workspace database. You can use SQL Server Management Studio to view the workspace database on the Analysis Services server. The workspace database name includes the project name, followed by an underscore, followed by the username, followed by an underscore, followed by a GUID.

The workspace database resides in-memory while the tabular model project is open in SQL Server Data Tools. When you close the project, the workspace database is either kept in-memory, stored to disk and removed from memory (default), or removed from memory and not stored on disk, as determined by the Workspace Retention property. For more information about the Workspace Retention property, see Workspace Database Properties later in this topic.

After you have added data to your model project by using the Table Import Wizard or by using copy/paste, when you view the tables, columns, and data in the model designer, you are viewing the workspace database. If you add additional tables, columns, relationships, etc. you are changing the workspace database.

Ważne:
If any of the tables in your model will contain a large number of rows, consider importing only a subset of the data during model authoring. By importing a subset of the data, you can reduce processing time and consumption of workspace database server resources.

[!UWAGA]

The preview window in the Select Tables and Views page in the Table Import Wizard, Edit Table Properties dialog box, and Partition Manager dialog box show tables, columns, and rows at the data source, and may not show the same tables, columns, and rows as the workspace database.

When you deploy a tabular model project, the deployed model database, which is essentially a copy of the workspace database, is created on the Analysis Services server instance specified in the Deployment Server property. For more information about the Deployment Server property, see Project Properties (SSAS Tabular).

The model workspace database typically resides on localhost or a local named instance of an Analysis Services server. You can use a remote instance of Analysis Services to host the workspace database, however, this configuration is not recommended due to latency during data queries and other restrictions. Optimally, the instance of Analysis Services that will host the workspace databases is on the same computer as SQL Server Data Tools. Authoring model projects on the same computer as the Analysis Services instance that hosts the workspace database can improve performance.

Remote workspace databases have the following restrictions:

• Potential latency during queries.

• The Data Backup property cannot be set to Backup to disk.

• You cannot import data from a PowerPivot workbook when creating a new tabular model project by using the Import from PowerPivot project template.

Workspace Database Properties

Workspace database properties are included in the model properties. To view model properties, in SQL Server Data Tools, in Solution Explorer, click the Model.bim file. Model properties can be configured using the Properties window. Workspace database specific properties include:

[!UWAGA]

Workspace Server, Workspace Retention, and Data Backup properties have default settings applied when you create a new model project. You can change the default settings for new model projects on the Data Modeling page in Analysis Server settings in the Tools\Options dialog box. These properties, as well as others, can also be set for each model project in the Properties window. Changing default settings will not apply to model projects already created. For more information, see Configure Default Data Modeling and Deployment Properties (SSAS Tabular).

Property	Default Setting	Description
Workspace Database	The project name, followed by an underscore, followed by the username, followed by an underscore, followed by a GUID.	The name of the workspace database used for storing and editing the in-memory model project. After a tabular model project is created, this database will appear in the Analysis Services instance specified in the Workspace Server property. This property cannot be set in the Properties window.
Workspace Retention	Unload in memory	Specifies how a workspace database is retained after a model project is closed. A workspace database includes model metadata and imported data. In some cases, the workspace database can be very large and consume a large amount of memory. By default, when you close a model project in SQL Server Data Tools, the workspace database is unloaded from memory. When changing this setting it is important to consider your available memory resources as well as how often you plan to work on the model project. This property setting has the following options: Keep in memory - Specifies to keep the workspace database in memory after a model project is closed. This option will consume more memory; however, when opening a model project in SQL Server Data Tools, fewer resources are consumed and the workspace database will load faster. Unload from memory - Specifies to keep the workspace database on disk, but no longer in memory after a model project is closed. This option will consume less memory; however, when opening a model project in SQL Server Data Tools, the workspace database must be re-attached; additional resources are consumed and the model project will load more slowly than if the workspace database is kept in memory. Use this option when in-memory resources are limited or when working on a remote workspace database. Delete workspace - Specifies to delete the workspace database from memory and not keep the workspace database on disk after the model project is closed. This option will consume less memory and storage space; however, when opening a model project in SQL Server Data Tools, additional resources are consumed and the model project will load more slowly than if the workspace database is kept in memory or on-disk. Use this option when only occasionally working on model projects. The default setting for this property can be changed on the Data Modeling page in Analysis Server settings in the Tools\Options dialog box.
Workspace Server	localhost	This property specifies the default server that will be used to host the workspace database while the model project is being authored in SQL Server Data Tools. All available instances of Analysis Services running on the local computer are included in the listbox. To specify a different Analysis Services server (running in Tabular mode), type the server name. The user logged on must be an Administrator on the Analysis Services server. [!UWAGA] It is recommended you specify a local Analysis Services server as the workspace server. For workspace databases on a remote server, importing from PowerPivot is not supported, data cannot be backed up locally, and the user interface may experience latency during queries. The default setting for this property can be changed on the Data Modeling page in Analysis Services settings in the Tools\Options dialog box.

Using SSMS to Manage the Workspace Database

You can use SQL Server Management Studio (SSMS) to connect to the Analysis Services server that hosts the workspace database. Typically, there is no management of the workspace database necessary; the exception, is to detach or delete a workspace database, which must be done from SQL Server Management Studio.

Przestroga
Do not use SQL Server Management Studio to manage the workspace database while the project is open in the model designer. Doing so could lead to data loss.

Related Tasks

Topic	Description
Model Properties (SSAS Tabular)	Provides descriptions and configuration steps for a model’s workspace database properties.

Zobacz także

Koncepcje

Configure Default Data Modeling and Deployment Properties (SSAS Tabular)

Project Properties (SSAS Tabular)