Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. The query issued to the SQL Server is like this: SELECT MAX ( [t0]. Online services like Salesforce and Dynamics 365. For example, rather than dragging in the CountryRegion and Sales measures, and then filtering by a particular year, apply the filter on the Year field first. Whether the report defines row-level security. They can achieve dramatic performance enhancements when visuals query higher-level aggregates. The following Power BI reporting capabilities can cause performance issues in DirectQuery-based reports: Measure filters: Visuals that use measures or aggregates of columns can contain filters in those measures. The refresh of a visual is instantaneous if the exact same results were recently obtained. This pattern restricts using query statements that use Common Table Expressions (CTEs) and stored procedures. It's still best to hide such columns. There can be a large multiplier effect. You don't always have to import full detailed data. The number of users that share the report and dashboard. When you use DirectQuery to connect to a data source in Power BI Desktop, the following results occur: You use Get Data to select the source. The table storage mode can be Import or DirectQuery, or both, known as Dual. When this column is used to filter or group in a visual, Power BI will generate a query that does not need to join the Sales and Product tables. Avoid relationships on calculated columns. When you use DirectQuery, the overall experience depends on the performance of the underlying data source. You can switch off such totals by using the Format pane. This guidance generally improves query performance, although it depends on the specifics of the data source. They will allow configuring more efficient model relationships that expect matched values on both sides of relationships. Look at the status bar on the right side. In the Power BI Desktop ribbon, click the small triangle at the bottom of the Get Data button. This article targets data modelers developing Power BI DirectQuery models, developed by using either Power BI Desktop or the Power BI service. The dashboard tiles can also be updated more frequently, as often as every 15 minutes. If you can't meet your goals by importing data, for example if the data changes frequently and reports must reflect the latest data, consider using DirectQuery. Upon load, all the data defined by the queries imports into the Power BI cache. This approach again sends two queries to the underlying source. When you connect to a data source like SQL Server and import data in Power BI Desktop, the following results occur: When you initially Get Data, each set of tables you select defines a query that returns a set of data. This situation also applies when you connect to the following sources, except there's no option to import the data: Power BI datasets, for example connecting to a Power BI dataset that's already published to the service, to author a new report over it. For example, to retrieve to the sales orders that were created in the last year (relative to today's date). As you create or interact with a visualization, Power BI Desktop uses the imported data. If you use row-level security, each tile requires separate queries per user to be sent to the underlying source. Any transformations must be applied on every query to the underlying source, rather than once on data refresh. The source must be able to handle such a query load while maintaining reasonable performance. A Composite model can integrate more than one DirectQuery source, and it can also include aggregations. You can use the ActivityID value to determine which events belong to the same group. This approach is reasonable for calculating the median over a relatively small number of results. This way, they can act both ways, depending on the situation they are used in. For example, in a RelativeYear column, the value zero represents current year, -1 represents previous year, etc. Given that more than one query might be required for a single visual, for example, to obtain the details and the totals, even consistency within a single visual isn't guaranteed. It is also possible to show an Apply button on slicers and filters. This time, only metadata will be loaded into Power BI. See the following articles for details about specific sources: More info about Internet Explorer and Microsoft Edge, Use DirectQuery for Power BI datasets and Analysis Services (preview), DirectQuery in SQL Server 2016 Analysis Services, Overview of single sign-on (SSO) for gateways in Power BI, Enable bidirectional cross-filtering for DirectQuery in Power BI Desktop, How visuals cross-filter each other in a Power BI report. Avoid relationships on "Unique Identifier" columns: Power BI does not natively support the unique identifier (GUID) data type. DirectQuery for Power BI datasets and Azure Analysis Services (preview Power BI uses the query as provided, without an attempt to rewrite it. By applying filters early, it generally makes those intermediate queries less costly and faster. It's still necessary to refresh. It may result in two queries being sent to the underlying source: It generally performs fine if there are hundreds or thousands of categories, as in this example. However, large data might also make the performance of queries against that underlying source too slow. Each step of building a visual sends a query. Almost all reporting capabilities are supported for DirectQuery models. To ensure that opening a dashboard is fast, the tiles automatically refresh on a schedule, for example every hour. Making the switch to DirectQuery from Import mode: Click Edit Queries to open the Power Query Editor. You should import data into Power BI wherever possible. For more information, see Use composite models in Power BI Desktop. A business user can use Power BI to connect to their data in Salesforce, for example, and immediately get a dashboard, without using Power BI Desktop. You can use your current Windows credentials or database credentials. This pattern restricts using query statements that use Common Table Expressions (CTEs) and stored procedures. Often, optimizations need to be applied directly to the data source to achieve good performance results. Carefully consider the limitations and implications of using DirectQuery. Switch off interaction between visuals: Cross-highlighting and cross-filtering interactions require queries be submitted to the underlying source. Include a few more actions, to ensure that the events of interest flush into the trace file. Attend online or watch the recordings of this Power BI specific conference, which includes 130+ sessions, 130+ speakers, product managers, MVPs, and experts. Each AnalysisServicesWorkspace folder includes a Data subfolder that contains the trace file FlightRecorderCurrent.trc for the current Power BI session. The following columns are also of interest: To capture a trace to help diagnose a potential performance issue: Open a single Power BI Desktop session, to avoid the confusion of multiple workspace folders. It generally improves query performance, though it does depend on the specifics of the relational database source. I'm investing myself into four major focuses:<br><br>(1) As a data, product, and strategy expert. SQL Server Profiler displays all events from the current session. One or more pairs of DirectQuery Begin and DirectQuery End events, which represent queries sent to the underlying data source as part of evaluating the DAX query. You can set the maximum number of connections DirectQuery opens for each underlying data source, which controls the number of queries concurrently sent to each data source. Connecting with DirectQuery can be useful in the following scenarios. However, the first query will return all categories from the underlying source, and then the top N are determined based on the returned results. Power BI will translate its internal queries into queries that get send to the underlying data sources . Depending upon the location of the original data source, it might be necessary to configure an on-premises data gateway to get the data. For relational sources, you can still select a set of tables that define a query that logically returns a set of data. A filter can only touch a table once. While it's easy to initially make the connection in the Power BI service, there are limitations on further enhancing the resulting report. For more information, see DirectQuery and SAP HANA. If your using SQL try right clicking a step and see if "View native query" is not grayed out then it is folding just fine. For example, live connections always pass the identity of the user opening the report to the underlying SQL Server Analysis Services source. Avoid relationships on calculated columns: Model relationships can only relate a single column in one table to a single column in a different table. In particular, it's not possible to use a query with common table expressions, nor one that invokes stored procedures. By default, Power BI Desktop logs events during a given session to a trace file called FlightRecorderCurrent.trc. Cross-filtering two tables in a DirectQuery source by filtering them with a table outside of the source is a bad design and is not supported. DirectQuery is also a feature of SQL Server Analysis Services. In PowerBI desktop I "connected" a table with directquery. For an introduction, refer to the DirectQuery models in Power BI Desktop article. There are three subselect queries for Web_Sales, Item, and Date_dim, which each return all the columns on the respective table, even though the visual references only four columns. Performance can degrade if the number of categories is much larger. In several of these cases, leaving the data in its original source location is necessary or beneficial. Find out more about the online and in person events happening in March! The following sections cover the three options for connecting to data: import, DirectQuery, and live connection. I have a similar problem. Performance issues are often based on the performance of the underlying source. For more information about using large models in Power BI, see large datasets in Power BI Premium. this table uses directquery and cannot be shown For example, when you use import to connect to SQL Server Analysis Services, you define a query against the external SQL Server Analysis Services source, and import the data. You should switch off this interaction if the time taken to respond to users' selections is unreasonably long. For more information, see Guidance for designing distributed tables in Azure Synapse Analytics (formerly SQL Data Warehouse). Since many PostgreSQL are having similar issues, I would like to have an update from Microsoft what support Power BI offers for using DirectQuery with PostgreSQL databases. This could include even the simplist of dax queries which happened during model validation like distince count of values in each column that there is a relationship too, or it put as a filter/legend. Please mark my reply as solution. Please mark my reply as solution. Examples of modeling include: You can still make many of these model enrichments when you use DirectQuery, and use the principle of enriching the raw data to improve later consumption. . But returning the slicer to its original value could result in it again showing the cached previous value. Similarly, creating or editing a report requires queries to be sent for each step on the path to produce the final visual. The first query retrieves the categories that meet the condition, The second query retrieves the necessary data for the visual, which includes the categories that met the, Azure Synapse Analytics (formerly SQL Data Warehouse). For example, the following graphic shows SalesAmount by Category, but only for categories with more than 20M of sales. Reports based on a DirectQuery dataset can be optimized in many ways, as described in the following bulleted list. Easily getting the correct aggregate data needed for a visual directly from the source requires sending queries per visual, as in DirectQuery. If tables or columns are removed from the underlying source, it might result in query failure upon refresh. Table and column references using DAX variables - SQLBI Unless these interactions are necessary, it's recommended they be switched off if the time taken to respond to users' selections would be unreasonably long. If you can identify a single sluggish visual on a page in Power BI Desktop, you can use Performance Analyzer to determine what queries Power BI Desktop sends to the underlying source. I click on Get Data, then select SQL Server Database and click Connect I then put in my Server and Database In the above I had to ensure that I selected DirectQuery There's also a limit on the size of the trace file, so for long sessions, there's a chance of early events dropping. The report pages are taking too long to load, and the tables aren't updating rapidly enough when changes are made. As no data is stored in the model any data needed for visualizations will be retrieved from the data source directly. The time it takes to refresh the visual depends on the performance of the underlying data source. This might be supported in the future. Direct Query Mode in Power BI for Azure Analysis Services - SQL Shack Direct Query in Power BI What, When & Why? An Introduction to Prehistoric England | English Heritage For example, if the Sales table stores data at order line level, you could create a view to summarize this data. Date/time support only to the seconds level: For datasets that use time columns, Power BI issues queries to the underlying DirectQuery source only up to the seconds detail level, not milliseconds. These columns store offset values relative to the current date. Connecting to Power BI datasets and Analysis Services in DirectQuery mode always uses SSO, so the security is similar to live connections to Analysis Services. Hide the one-side column of relationships: The one-side column of a relationship should be hidden. PowerBI table does not show value when using "Direct query" table Attend online or watch the recordings of this Power BI specific conference, which includes 130+ sessions, 130+ speakers, product managers, MVPs, and experts. Limitations in calculated columns: Calculated columns can only be intra-row, that is they can refer only to values of other columns of the same table, without using any aggregate functions. Queries might even time out. Once you publish a report to the Power BI service, the maximum number of concurrent queries also depends on fixed limits set on the target environment where the report is published. A visual that asks for data at a higher-level aggregate, such as TotalSales by Year, further aggregates the aggregate value. If rows in the Sales table contain a missing product key value, substitute them with -1. Make a note of the location. Additionally, the list of limitations that accompany use of DirectQuery should be considered carefully." The value applies to all DirectQuery sources, and to any new DirectQuery sources added to the model. To change the maximum number for the current file in Power BI Desktop, go to File > Options and Settings > Options, and select DirectQuery in the Current File section of the left pane.