Common search for new SSIS programmer looking for change is what
questions to expect on SSIS. Based on the interviews I take on SSIS, I will
list down my favorites and expected questions on SSIS.
Q1 Explain architecture of SSIS?
SSIS architecture consists of four key parts:
a) Integration Services service: monitors running Integration Services packages and manages the storage of packages.
b) Integration Services object model: includes managed API
for accessing Integration Services tools, command-line utilities, and custom
applications.
c) Integration Services runtime and run-time executables: it
saves the layout of packages, runs packages, and provides support for logging,
breakpoints, configuration, connections, and transactions. The Integration
Services run-time executables are the package, containers, tasks, and event
handlers that Integration Services includes, and custom tasks.
d) Data flow engine: provides the in-memory buffers that
move data from source to destination.
Q2 How would you do Logging in SSIS?
Logging Configuration provides an inbuilt feature which can log the detail of various events like onError, onWarning etc to the various options say a flat file, SqlServer table, XML or SQL Profiler.
Q3 How would you do Error Handling?
A SSIS package could mainly have two types of errors
a) Procedure Error: Can be handled in Control flow through the precedence control and redirecting the execution flow.
b) Data Error: is handled in DATA FLOW TASK buy redirecting the data flow using Error Output of a component.
Q4 How to pass property value at Run time? How do you implement Package Configuration?
A property value like connection string for a Connection Manager can be passed to the pkg using package configurations.Package Configuration provides different options like XML File, Environment Variables, SQL Server Table, Registry Value or Parent package variable.
Q5 How would you deploy a SSIS Package on production?
1. Create deployment utility by setting its propery as true .
2. It will be created in the bin folder of the solution as soon as package is build.
3. Copy all the files in the utility and use manifest file to deply it on the Prod.
Q6 Difference between DTS and SSIS?
Every thing except both are product of Microsoft :-).
Q7 What are new features in SSIS 2008?
explained in other post
google can provide more than me J
Q8 How would you pass a variable value to Child Package?
Know about Parent and Child Relationship and Parent Package Config.
Q9 What is Execution Tree?
Execution trees demonstrate how package uses buffers and threads. At run time, the data flow engine breaks down Data Flow task operations into execution trees. These execution trees specify how buffers and threads are allocated in the package. Each tree creates a new buffer and may execute on a different thread. When a new buffer is created such as when a partially blocking or blocking transformation is added to the pipeline, additional memory is required to handle the data transformation and each new tree may also give you an additional worker thread.
Q10 What are the points to keep in mind for performance improvement of the package?
http://technet.microsoft.com/en-us/library/cc966529.aspx
Q11 You may get a question stating a scenario and then asking you how would you create a package for that e.g. How would you configure a data flow task so that it can transfer data to different table based on the city name in a source table column?
Q13 Difference between Unionall and Merge Join?
a) Merge transformation can accept only two inputs whereas Union all can take more than two inputs
b) Data has to be sorted before Merge Transformation whereas Union all doesn't have any condition like that.
Q14 May get question regarding what X transformation do?Lookup, fuzzy lookup, fuzzy grouping transformation are my favorites.
For you.
Q15 How would you restart package from previous failure point?What are Checkpoints and how can we implement in SSIS?
When a package is configured to use checkpoints, information about package execution is written to a checkpoint file. When the failed package is rerun, the checkpoint file is used to restart the package from the point of failure. If the package runs successfully, the checkpoint file is deleted, and then re-created the next time that the package is run.
Q16 Where are SSIS package stored in the SQL Server?
MSDB.sysdtspackages90 stores the actual content and ssydtscategories, sysdtslog90, sysdtspackagefolders90, sysdtspackagelog, sysdtssteplog, and sysdtstasklog do the supporting roles.
Q17 How would you schedule a SSIS packages?
Using SQL Server Agent. Read about Scheduling a job on Sql server Agent
Q18 Difference between asynchronous and synchronous transformations?
Asynchronous transformation have different Input and Output buffers and it is up to the component designer in an Async component to provide a column structure to the output buffer and hook up the data from the input.
Q19 How to achieve parallelism in SSIS?
Q2 How would you do Logging in SSIS?
Logging Configuration provides an inbuilt feature which can log the detail of various events like onError, onWarning etc to the various options say a flat file, SqlServer table, XML or SQL Profiler.
Q3 How would you do Error Handling?
A SSIS package could mainly have two types of errors
a) Procedure Error: Can be handled in Control flow through the precedence control and redirecting the execution flow.
b) Data Error: is handled in DATA FLOW TASK buy redirecting the data flow using Error Output of a component.
Q4 How to pass property value at Run time? How do you implement Package Configuration?
A property value like connection string for a Connection Manager can be passed to the pkg using package configurations.Package Configuration provides different options like XML File, Environment Variables, SQL Server Table, Registry Value or Parent package variable.
Q5 How would you deploy a SSIS Package on production?
1. Create deployment utility by setting its propery as true .
2. It will be created in the bin folder of the solution as soon as package is build.
3. Copy all the files in the utility and use manifest file to deply it on the Prod.
Q6 Difference between DTS and SSIS?
Every thing except both are product of Microsoft :-).
Q7 What are new features in SSIS 2008?
explained in other post
google can provide more than me J
Q8 How would you pass a variable value to Child Package?
Know about Parent and Child Relationship and Parent Package Config.
Q9 What is Execution Tree?
Execution trees demonstrate how package uses buffers and threads. At run time, the data flow engine breaks down Data Flow task operations into execution trees. These execution trees specify how buffers and threads are allocated in the package. Each tree creates a new buffer and may execute on a different thread. When a new buffer is created such as when a partially blocking or blocking transformation is added to the pipeline, additional memory is required to handle the data transformation and each new tree may also give you an additional worker thread.
Q10 What are the points to keep in mind for performance improvement of the package?
http://technet.microsoft.com/en-us/library/cc966529.aspx
Q11 You may get a question stating a scenario and then asking you how would you create a package for that e.g. How would you configure a data flow task so that it can transfer data to different table based on the city name in a source table column?
Q13 Difference between Unionall and Merge Join?
a) Merge transformation can accept only two inputs whereas Union all can take more than two inputs
b) Data has to be sorted before Merge Transformation whereas Union all doesn't have any condition like that.
Q14 May get question regarding what X transformation do?Lookup, fuzzy lookup, fuzzy grouping transformation are my favorites.
For you.
Q15 How would you restart package from previous failure point?What are Checkpoints and how can we implement in SSIS?
When a package is configured to use checkpoints, information about package execution is written to a checkpoint file. When the failed package is rerun, the checkpoint file is used to restart the package from the point of failure. If the package runs successfully, the checkpoint file is deleted, and then re-created the next time that the package is run.
Q16 Where are SSIS package stored in the SQL Server?
MSDB.sysdtspackages90 stores the actual content and ssydtscategories, sysdtslog90, sysdtspackagefolders90, sysdtspackagelog, sysdtssteplog, and sysdtstasklog do the supporting roles.
Q17 How would you schedule a SSIS packages?
Using SQL Server Agent. Read about Scheduling a job on Sql server Agent
Q18 Difference between asynchronous and synchronous transformations?
Asynchronous transformation have different Input and Output buffers and it is up to the component designer in an Async component to provide a column structure to the output buffer and hook up the data from the input.
Q19 How to achieve parallelism in SSIS?
Parallelism is achieved using MaxConcurrentExecutable property
of the package. Its default is -1 and is calculated as number of processors +
2.
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