SSIS Advanced Interview Questions And Answers
SSIS Interview Questions For Experienced. Here you will notice a tremendous list of SSIS interview questions on various summaries. We believe that certain questions will provide you an opinion regarding what kind of SSIS questions will be suggested when ETL developer job or the SSIS developer interview.
If you desire to achieve the database management purpose, you’ll require knowing SSIS. SQL Server Integration Services (SSIS) comprises maintaining, scheduling, and shifting data to your Microsoft SQL database servers SQL Server training. SSIS integration restores the traditional data alteration services (DTS) that would get data from one place and send it to your database.
SSIS Advanced Interview Questions:
There are a number of openings from numerous reputed organizations in the business. According to the analysis, SSIS has a business percentage of approximately 25%. Therefore, you, however, own the chance to move forward in your profession in SSIS.
SVR Technologies gives the latest SQL Server Technical Interview Questions 2018 which in turn benefits you in answering your interview & obtain the desired profession as SSIS Developer. Hence if you are viewing a job that is relevant to SSIS, you must qualify for the SSIS interview questions. Though all SSIS interview is varied and the scope of a job is similarly diverse, we can assist you out with the top SSIS interview questions and answers, which will encourage you to take the leap and take you success in your SSIS interview. Having this in determination we have composed the best familiar SSIS interview questions and answers to support you get success in your interview.
1. What Is A Container And How Many Types Of Containers Are There?
Answer: A container is a logical grouping of tasks which allows you to manage the scope of the tasks together.
These are the types of containers in SSIS:
- Sequence Container – Used for grouping logically related tasks together
- For Loop Container – Used when you want to have repeating flow in a package
- For Each Loop Container – Used for enumerating each object in a collection; for example a recordset or a list of files.
- Apart from the above-mentioned containers, there is one more container called the Task Host Container which is not visible from the IDE, but every task is contained in it (the default container for all the tasks).
2. What Is A Precedence Constraint And What Types Of Precedence Constraint Are There?
Answer: SSIS allows you to place as many tasks you want to be placed in the control flow. You can connect all these tasks using connectors called Precedence Constraints. Precedence Constraints allow you to define the logical sequence of tasks in the order they should be executed. You can also specify a condition to be evaluated before the next task in the flow is executed.
These are the types of precedence constraints and the condition could be either a constraint, an expression or both Success (next task will be executed only when the last task completed successfully) or Failure (next task will be executed only when the last task failed) or Complete (next task will be executed no matter the last task was completed or failed).
3. What Is A Transformation?
Answer: A transformation simply means bringing in the data in the desired format. For example, you are pulling data from the source and want to ensure only distinct records are written to the destination, so duplicates are removed. Another example is if you have master/reference data and want to pull only related data from the source and hence you need some sort of lookup. There are around 30 transformation tasks available and this can be extended further with custom-built tasks if needed.
4. If You Want To Send Some Data From Access Database To Sql Server Database. What Are Different Component Of Ssis Will You Use?
Answer: In the data flow, we will use one OLE DB source, data conversion transformation, and one OLE DB destination or SQL server destination. OLE DB source is data source is useful for reading data from Oracle, SQL Server, and Access databases. Data Conversion transformation would be needed to remove datatype abnormality since there is a difference in datatype between the two databases (Access and SQL Server) mentioned.
If our database server is stored on and the package is run from the same machine, we can use SQL Server destination otherwise we need to use OLE DB destination. The SQL Server destination is the destination that optimizes the SQL Server.
5. How To Handle Late Arriving Dimension Or Early Arriving Facts?
Answer: Late-arriving dimensions sometimes get unavoidable ‘coz delay or error in Dimension ETL or may be due to a logic of ETL. To handle Late Arriving facts, we can create a dummy Dimension with natural/business key and keep the rest of the attributes as null or default. And as soon as the Actual dimension arrives, the dummy dimension is updated with Type 1 change. These are also known as Inferred Dimensions.
6. What is a workflow in SSIS 2014?
Answer: Workflow is a set of instructions on to specify the Program Executor on how to execute tasks and containers within SSIS Packages
7. What is the difference between Multicast and Conditional Split?
Answer: The Multicast transformation distributes its input to one or more outputs. This transformation is similar to the Conditional Split transformation. Both transformations direct input to multiple outputs. The difference between the two is that the Multicast transformation directs every row to every output, and the Conditional Split directs a row to a single output.
8. What is Manifest file in SSIS?
Answer: The manifest file is the utility which can be used to deploy the package using the wizard on the file system and SQL Server database.
9. How to back up or retrieve the SSIS packages?
Answer: If your package is deployed on SQL Server then you can back up the MSDB database as all the package on SQL server deploys at MSDB.
10. What kind of variables can you create?
Answer: You can create global variables and task level variables in SSIS. For programmers, these variables are the same as global and function level variables. A global variable is available to all tasks across the entire job. Variables created in tasks are only available within that task.