Jul 23, 2015

SSRS Interview Questions & Answers (Part-7)

Q: What are the different types of reports in SSRS?
The types of reports in SSRS are given below:
  • Parameterized reports
  • Linked reports
  • Snapshot reports
  • Cached reports
  • Ad hoc reports
  • Clickthrough reports
  • Drilldown reports
  • Drillthrough reports
  • Subreports

Q: What is Parameterized Reports in SSRS ?
A parameterized report uses input values to complete report or data processing. With a parameterized report, you can vary the output of a report based on values that are set when the report runs. Parameterized reports are frequently used for drill-through reports, linked reports, and sub-reports, connecting and filtering reports with related data.

Q: What is Linked Report?
A linked report is a report server item that provides an access point to an existing report. Conceptually, it is similar to a program shortcut that you use to run a program or open a file.
A linked report is derived from an existing report and retains the original's report definition. A linked report always inherits report layout and data source properties of the original report. All other properties and settings can be different from those of the original report, including security, parameters, location, subscriptions, and schedules.
You can create a linked report on the report server when you want to create additional versions of an existing report. For example, you could use a single regional sales report to create region-specific reports for all of your sales territories.
Although linked reports are typically based on parameterized reports, a parameterized report is not required. You can create linked reports whenever you want to deploy an existing report with different settings

Q: What is Snapshot Report?
A report snapshot is a report that contains layout information and query results that were retrieved at a specific point in time. Unlike on-demand reports, which get up-to-date query results when you select the report, report snapshots are processed on a schedule and then saved to a report server. When you select a report snapshot for viewing, the report server retrieves the stored report from the report server database and shows the data and layout that were current for the report at the time the snapshot was created.
Report snapshots are not saved in a particular rendering format. Instead, report snapshots are rendered in a final viewing format (such as HTML) only when a user or an application requests it. Deferred rendering makes a snapshot portable. The report can be rendered in the correct format for the requesting device or Web browser.
Report snapshots serve three purposes:
  • Report history: By creating a series of report snapshots, you can build a history of a report that shows how data changes over time.
  • Consistency: Use report snapshots when you want to provide consistent results for multiple users who must work with identical sets of data. With volatile data, an on-demand report can produce different results from one minute to the next. A report snapshot, by contrast, allows you to make valid comparisons against other reports or analytical tools that contain data from the same point in time.
  • Performance: By scheduling large reports to run during off-peak hours, you can reduce processing impact on the report server during core business hours.

Q: What is Cached Report?
A cached report is a saved copy of a processed report. Cached reports are used to improve performance by reducing the number of processing requests to the report processor and by reducing the time required to retrieve large reports. They have a mandatory expiration period, usually in minutes.

Q: Whar are Click-through Reports?
A click-through report is a report that displays related data from a report model when you click the interactive data contained within your model-based report. These reports are generated by the report server based on the information contained within the report model. The person who created the model determines which fields are interactive and which fields are returned when a click-through report is opened. These field settings cannot be changed in the report authoring tools. Click-through reports are auto-generated. However, you can create an alternative customized report to the model for interactive data items that is displayed instead. The custom report is a standard Reporting Services report.

Q: What are Drill-down Reports?
Drill-down reports initially hide complexity and enable the user to toggle conditionally hidden report items to control how much detail data they want to see. Drill-down reports must retrieve all possible data that can be shown in the report.
For reports with large amounts of data, consider drill-through reports instead.

Q: What are Drill-through Reports?
Drill-through reports are standard reports that are accessed through a hyperlink on a text box in the original report. Drill-through reports work with a main report and are the target of a drillthrough action for a report item such as placeholder text or a chart. The main report displays summary information, for example in a matrix or chart. Actions defined in the matrix or chart provide drill-through links to reports that display greater details based on the aggregate in the main report. Drill-through reports can be filtered by parameters, but they do not have to be. Drillthrough reports differ from sub-reports in that the report does not display within the original report, but opens separately. They differ from click-through reports in that they are not auto-generated from the data source, but are instead custom reports that are saved on the report server. They differ from drill-down reports in that they retrieve the report data only for the specified parameters or for the dataset query.

Q: What is Subreport?
A subreport is a report that displays another report inside the body of a main report. Conceptually, a subreport is similar to a frame in a Web page. It is used to embed a report within a report. Any report can be used as a subreport. The subreport can use different data sources than the main report. The report that the subreport displays is stored on a report server, usually in the same folder as the parent report. You can set up the parent report to pass parameters to the subreport.
Although a subreport can be repeated within data regions using a parameter to filter data in each instance of the subreport, subreports are typically used with a main report as a briefing book or as a container for a collection of related reports.
Step by Step Example of Sub Report...
For reports with many instances of subreports, consider using drillthrough reports instead.

Q: What is Data Set in report?
Data set is a set of data which we want to show in report. Data source is the source of data from where we are getting this data (database server name, database name, connection string).

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