Datastage Interview Question and Answers

Datastage Interview Question and Answers1. What is the difference between DataStage and Informatica?     DataStage support parallel processing which informatica doesn’t. Links are object in the DataStage ,in Informatica it’s a port to port connectivity . In Informatica its easy to implement Slowly Changing Dimensions which is little bit complex in DataStage. DataStage doesn’t support complete error handling. 2. What are the components of Ascential Data Stage?   Client Components - Administrator, Director, Manager, and Designer. Server Components - Repository, Server and Plug-ins. 3. What are System variables? System variables comprise of a set of variables which are used to get system information and they can be accessed from a transformer or a routine. They are read only and start with an @. 4. what are the enhancements made in datastage 7.5 compare with 7.0? Many new stages were introduced compared to datastage version 7.0. In server jobs we have stored procedure stage, CDC Stage ,command stage and generate report option was there in file tab. In job sequence many stages like startloop activity, end loop activity,terminate loop activity and user variables activities were introduced. In parallel jobs surrogate key stage, stored procedure stage were introduced. 5. What is DataStage?      Design jobs for Extraction, Transformation and Loading(ETL). Ideal tool data integration projects such as data warehouses, data marts and system migrations. Import,export,create and managed metadata for use within jobs. Schedule, run and monitor jobs all within DataStage Adminsters your Datastage development and execution environments. 6. What is a merge?     Merge is a stage that is available in both parallel and server jobs. The merge stage is used to join two tables(server/parallel) or two tables/datasets(parallel). Merge requires that the master table/dataset and the update table/dataset to be sorted. Merge is performed on a key field, and the key field is mandatory in the master and update dataset/table. 7.One process will handling the communication from sequential file stage to IPC stage. 9. What are the types of Containers? There are Two types of containers namely   Local Container Shared Container . Whats difference betweeen operational data stage (ODS) and data warehouse?     A dataware house is a decision support database for organisational needs.We can set eithere as Project level or Job level. In simple terms ODS is dynamic data. How the IPC Stage work? If we used the IPC Stage between source and target . ODS(Operational Data Source) is a integrated collection of related information . the IPC stage can start passing data to the ODBC stage.It is subject oriented. As soon as the Sequential File stage has opened its output link. 8.non volatile. What is environment variables? Basically Environment variable is predefined variable those we can use while creating DS job. 10. What is Active and Passive Stage? Passive Stages are used for data extraction and loading .while Active Stage are used to implements and process the business rules. What are Sequencers? A sequencer allows you to synchronize the control flow of multiple activities in a job sequence. this db keeps integrated data from different tdb and allow common operations across organisation. 14. eg: banking transaction. 11. 12.time varient collect of data. 13. ODS is nothing but operational data store is the part of transactional database. How do u convert the columns to rows in DataStage? Using Pivot Stage . It can have multiple input triggers as well as multiple output triggers. What is version Control? Version Control stores different versions of DS jobs runs different versions of same job reverts to previos version of a job view version histories.Once we set specific variable that variable will be availabe into the project/job.integrated . and other will handling communication from IPC stage to ODBC stage. it contains maximum 90 days information. prompt. 22.EDIT > JOBPARAMETERSIn that Parameters Tab we can define the name. Derivations and Constants?  Stage Variable . 18. What is the difference between Hashfile and Sequential File? Hash file stores the data based on hash algorithm and on a key value. 24. 17. 19. What is Staging Variable? These are the temporary variables created in transformer for calculation.type. How do you generate Sequence number in Datastage? Using the Routine    KeyMgtGetNextVal KeyMgtGetNextValConn They can also be done by Oracle Sequence. What are the types of jobs we have in Datastage?    Server Jobs Parallel Jobs Mainframe Jobs 21. Hash file used as a reference for look up. what are the Job parameters? These Parameters are used to provide Administrative access and change run time values of the job. What is the difference between Account and Directory options ? Account option create the hashfile in the current project itself using condition and for Directory option we have to specify the path of the directory. 20. A sequential file is just a file with no key column.value. 23. What are Routines? Routines are the functions which we develop in BASIC Code for required tasks. What are Stage Variables. What is the difference between Server Job and Parallel Jobs? Server Jobs works in sequential way while parallel jobs work in parallel fashion (Parallel Extender work on the principal of pipeline and partition) for Inpur/Output processing. 16.15.An intermediate processing variable that retains value during read . which we Datastage is not fully supported (Complex). Where the DataStage stored his repository? DataStage stored his repository in IBM Universe Database. Sequential file cannot. execute. 27. using a C or C++ program. 30.We can use this stage to connect two passive stages or two active stages. . What is orabulk Stage? This Stage is used to Bulk Load the Oracle Target Database.  and does not pass the value into target column. 28. It allows one to use operations like logon. How can we improve the performance in DataStage? In server canvas we can improve performance in two ways   Firstly we can increase the memory by enabling interprocess row buffering in job properties Secondly by inserting an IPC stage we break a process into two processes.apt file that has the node's information and Configuration of SMP/MMP server. 25.Expression that specifies value to be passed on to the target column.apt file. Dont confuse that with *. The columns from the records in the master and update data sets are merged so that the output record contains all the columns from the master record plus any additional columns from each update record. Constant . parss etc. disk storage information etc. 31. Derivation . For example this file consists information of node names. What is Merge Stage? The Merge stage combines a sorted master data set with one or more sorted update data sets. What is APT_CONFIG in datastage? Datastage understands the architecture of the system through this file(APT_CONFIG_FILE). 29. What is OCI? If you mean by Oracle Call Interface (OCI).Conditions that are either true or false that specifies flow of data with a link. APT_CONFIG is just an environment variable used to idetify the *. why fact table is in normal form? A fact table consists of measurements of business requirements and foreign keys of dimensions tables as per business rules. What are orabulk and bcp stages? These are called as plug-in stages orabulk is used when v have bulk data in oracle then v go for orabulk for other than oracle database we go for bcp stages. it is a set of low-level APIs used to interact with Oracle databases. 26. managing aggregations. How and where you used HASH file? HASH file is used for Lookup while populating fact table .32. Metadata includes things like the name. and navigation services. able to answer any adhoc.We can directly map the single source columns to two different targets. How do you schedule or monitoring the job? Using the DataStage Director we can schedule or monitor the job. 38. 33. Metadata is stored in a data dictionary and repository. What is the difference between the local container and shared container? Local Container is local to the particular job in which we developed the container. Metadata is data about data.basically it keeps the data in buffer and use Hashing algorithm which improves the performance of the job. . For Rows . What all are the different way to run a job? Using DataStage Director and DataStage Administration Client. 37. What is Container and then types? Containers are the reusable set of stages. There are two types of container are :   Local Container Shared Container 34. How one source columns or rows to be loaded in to two different tables? For Columns . Some vendors are replacing the term OLAP with the terms analytical software and business intelligence. warehousing refers to the organization and storage of data from a variety of sources so that it can be analyzed and retrieved easily.NUM. retrieval and visualization. Shared Container is can be used in any other jobs also. OLAP deals with the software and the process of analyzing data.analytical.We have to put some constraint (condition ). 39. data dictionaries. As the definitions suggest. length. The repository environment encompasses all corporate metadata resources: database catalogs. algorithm. What is the difference between data warehousing and OLAP? The terms data warehousing and OLAP are often used interchangeably. valid values.It uses GENERAL or SEQ.historical or complex queries. and description of a data element. 35. and partitioning information into cubes for indepth analysis. What are the Repository Tables in DataStage?     A datawarehouse is a repository(centralized as well as distributed) of Data. 36. an attribute maps to a column. In relational databases. 46. Passive Stage : In which Read/Write Process is done. How to join the multiple sources ?    An entity represents a chunk of information. Aggregator.40. What is a folder? Folder contains repository objects such as sources. 45. 41. transformation which are helps logically organize our data warehouse. Which algorithm you used for your hashfile? It uses GENERAL or SEQ. In relational databases. An attribute is a component of an entity and helps define the uniqueness of the entity. Ex: ODBC. 44. an attribute maps to a column. Sequential. An attribute is a component of an entity and helps define the uniqueness of the entity. an entity often maps to a table. Aggregation etc are done. targets. . In relational databases. 42. What can we do with DataStage Director?     Validating Scheduling Executing Monitoring Jobs (server Jobs). What all the types of Jobs you developed?     Server Job Parallel Job Sequencer Job Container Job. Ex: Transformer. algorithm 43. The entities are linked together using relationships. What are an Entity. mappings. Hash File. In relational databases. The entities are linked together using relationships. an entity often maps to a table.NUM. Attribute and Relationship?    An entity represents a chunk of information. What are the difference types of stages?   Active Stage : In which Transformation. You need to have a short statement prepared in your mind. co-workers or the organization. Start with the item farthest back and work up to the present. 3. Be careful that it does not sound rehearsed. which we use to convert the Dates from internal format to External format   iConv .Internal to External 50. Tell me about yourself: The most often asked question in interviews. 48. Read the questions listed. you will also find some strategy suggestions with it. Limit it to workrelated items unless instructed otherwise.47. If you do not have . Never refer to a major problem with management and never speak ill of supervisors. Talk about things you have done and jobs you have held that relate to the position you are interviewing for. If you do. 49. you will be the one looking bad. a chance to do something special or other forwardlooking reasons.External to Internal oConv. What experience do you have in this field? Speak about specifics that relate to the position you are applying for. 2.] Review these typical interview questions and think about how you would answer them. What are iConv and oConv? These are the Date functions. Keep smiling and talk about leaving for a positive reason such as an opportunity. How do you register plug-ins? Using DataStage Manager. Why did you leave your last job? Stay positive regardless of the circumstances. What is orabulk Stage? Stage is used to Bulk Load the Oracle Target Database. What are the different plug-ins Stages used in your projects?   Oracle bulk BCP Load 50 COMMON INTERVIEW QUESTIONS AND ANSWERS [Don't forget to have a look at free bonus at the end of this document. 1. What are the current issues and who are the major players? 7. Keep the focus on this job and what you can do for this organization. 6. a co-worker at Smith Company. 5. and you have met some and are on track to achieve the others. A nasty little game that you will probably lose if you answer first.Free Student Resources 50 Common Interview Questions and Answers This may take some thought and certainly. What do co-workers say about you? Be prepared with a quote or two from co-workers. It is as powerful as Jill having said it at the interview herself. Find out where they have been and where they are going. Have some good ones handy to mention. What kind of salary do you need? A loaded question. What have you done to improve your knowledge in the last year? Try to include improvement activities that relate to the job. always said I was the hardest workers she had ever known.com (www. do . A good explanation is that you have set goals. Are you applying for other jobs? Be honest but do not spend a lot of time in this area. Either a specific statement or a paraphrase will work. should be based on the research you have done on the organization. Sincerity is extremely important here and will easily be sensed. Why do you want to work for this organization? © JobsAssist. Relate it to your long-term career goals.com (www.com ) .jobsassist. 9. 10. This can affect your answer even though they asked about friends not relatives. So. 11. 4. Anything else is a distraction. Do you consider yourself successful? You should always answer yes and briefly explain why. Do you know anyone who works for us? Be aware of the policy on relatives working for the organization. Be careful to mention a friend only if they are well thought of. get as close as you can. 8. What do you know about this organization? This question is one reason to do some research on the organization before the interview.com ) and VyomWorld. A wide variety of activities can be mentioned as positive self-improvement.vyomworld. Jill Clark.specific experience. this is the type of work you prefer. .not answer it. That's the type of answer that works best here. 16. brief and avoid saying negative things about the people or organization involved. you will do it when it is the right thing to do. 19. taken off guard. That's a tough question. Have you ever been asked to leave a position? If you have not. Short and positive. It gives you a chance to highlight your best points as they relate to the position being discussed. 18. If you have. Specifics that show you often perform for the good of the team rather than for yourself are good evidence of your team attitude. But since you need to work. say something like. will tell you. Instead. Something like this should work: I'd like it to be a long time. Have you ever had to fire anyone? How did you feel about that? This is serious. showing a benefit to the organization. Give a little advance thought to this relationship. Do not brag. Then give a wide range. Can you tell me the range for this position? In most cases. Are you a team player? You are. 15. If you had enough money to retire right now. This is a key point. Do not mention any other candidates to make a comparison. would you? Answer yes if you would. say that it can depend on the details of the job. If not. a team player. 13. say no. 14. Explain how you would be an asset to this organization You should be anxious for this question. Be sure to have examples ready. Or As long as we both feel I'm doing a good job. Do you have strong feelings that the job gets done? Yes. Do not say yes if you do not mean it. Remember firing is not the same as layoff or reduction in force. 17. Do not make light of it or in any way seem like you like to fire people. be honest. of course. What is your philosophy towards work? The interviewer is not looking for a long or flowery dissertation here. 12. When it comes to the organization versus the individual who has created a harmful situation. you will protect the organization. At the same time. the interviewer. Why should we hire you? Point out how your assets meet what the organization needs. just say it in a matter-of-fact tone. How long would you expect to work for us if hired? Specifics here are not good. What irritates you about co-workers? This is a trap question. but the work is the most important.© JobsAssist. like the people. 22. Problem solver 29. you plant the suspicion that you will be dissatisfied with this position if hired. 21. Initiative. Team player.vyomworld. Minor objections will label you as a whiner. Your problem-solving skills. Tell me about your dream job. 27. What is your greatest strength? Numerous answers are good. you strain credibility. can contribute and can't wait to get to work. Your leadership skills. A few good examples: Your ability to prioritize. 25. Stay away from a specific job. A short statement that you seem to get along with folks is great. Hard work. What kind of person would you refuse to work with? Do not be trivial. 28. 23. violence or lawbreaking to get you to object. You cannot win. 24. If you say the job you are contending for is it. Think real hard but fail to come up with anything that irritates you. What would your previous supervisor say your strongest point is? There are numerous good possibilities: Loyalty.com ) . There is no better answer. Creativity. Your ability to focus on projects. Expertise. Positive attitude. Patience. Be sure and use a suggestion that was accepted and was then considered successful. One related to the type of work applied for is a real plus. Your positive attitude . The best is to stay genetic and say something like: A job where I love the work. Leadership. just stay positive.com (www.jobsassist. It would take disloyalty to the organization.com ) and VyomWorld. Your ability to work under pressure. experience and interest. Tell me about a problem you had with a supervisor . Your professional expertise.com (www. Why do you think you would do well at this job? Give several reasons and include skills. Tell me about a suggestion you have made Have a good one ready. If you say another job is it.Free Student Resources 50 Common Interview Questions and Answers 20. What is more important to you: the money or the work? Money is always important. What are you looking for in a job? See answer # 23 26. Energy. You were laid off in a reduction Company did not win a contract. Achievement. What motivates you to do your best on the job? This is a personal trait that only you can say. . 33. Recognition 34. 30.Your boss tell you that you are successful 36. This can create a lot of problems later on in your career.jobsassist. Do your skills match this job or another job more closely? Probably this one. What has disappointed you about a job? Don't get trivial or negative. Your outcomes are a success. Are you willing to put the interests of the organization ahead of your own? This is a straight loyalty and dedication question. you may well below the interview Stay develop a poor memory about any trouble with a supervisor. Safe areas are few but can include: Not enough of a challenge.Biggest trap boss. Be totally honest. Do not say yes just to get the job if the real answer is no. Tell me about your ability to work under pressure. © JobsAssist. Are you willing to work overtime? Nights? Weekends? This is up to you. Describe your management style. Be honest at this point and save yourself future grief.com ) . Do not give fuel to the suspicion that you may want another job more than this one. 31.com (www. but good examples are: Challenge. Give an example that relates to the type of position applied for. 38. positive and of all. 35.com ) and VyomWorld. 32. which would have given you more responsibility. 37.vyomworld. Would you be willing to relocate if required? You should be clear on this with your family prior to the interview if you think there is a chance it may come up. Do not worry about the deep ethical and philosophical implications. Just say yes.Free Student Resources 50 Common Interview Questions and Answers You may say that you thrive under certain types of pressure.com (www. If you tell about a right there. How would you know you were successful on this job? Several ways are good measures: You set high standards for yourself and meet them. This is a test to see if you will speak ill of your fall for it and problem with a former boss. they are no longer blind spots. What position do you prefer on a team working on a project? Be honest. Safe qualities are knowledgeable. Do not hand it to them. 47. well intentioned mistake with a positive lesson learned. 44. bring that up: Then.com (www.jobsassist. Some of the more common labels. what would you look for? Be careful to mention traits that are needed and that you have. state that you are very well qualified for the position. 45. Do you think you are overqualified for this position? Regardless of your qualifications. Pick a specific incident. determination to get the job done and work hard but enjoy your work are good. What qualities do you look for in a boss? Be generic and positive. The situational style is safe.com (www. If you were hiring a person for this job. Things like. fair. Tell me about a time when you helped resolve a dispute between others. Concentrate on your problem solving technique and not the dispute you settled. instead of one size fits all. loyal to subordinates and holder of high standards. a sense of humor. © JobsAssist. How do you propose to compensate for your lack of experience? First.com ) . What have you learned from mistakes on the job? Here you have to come up with something or you strain credibility. can have several meanings or descriptions depending on which management expert you listen to.vyomworld. . 46. If you are comfortable in different roles. 40. point that out. Do not reveal any personal areas of concern here.com ) and VyomWorld. If you know about blind spots. 42. Describe your work ethic. Do you have any blind spots? Trick question. Let them do their own discovery on your bad points. All bosses think they have these traits. point out (if true) that you are a hard working quick learner. Make it small. 41.Try to avoid labels. An example would be working too far ahead of colleagues on a project and thus throwing coordination off.Free Student Resources 50 Common Interview Questions and Answers 43. if you have experience that the interviewer does not know about. because it says you will manage according to the situation. like progressive. 39. Emphasize benefits to the organization. salesman or consensus. com/jobs/resume/offer.com (www. Questions prepared where you will be an asset to the organization are good. TOEFL. IIT etc at www.vyomworld. Tell me about the most fun you have had on the job.com Get Thousands of FREE Source codes in most of Computer platforms at www.jobsassist. CCNA.testsworld.48.Free Student Resources 50 Common Interview Questions and Answers Get FREE directory of 5000 IT companies at www. C.bestebooksworld.vyomlinks. JAVA. Talk about having fun by accomplishing something for the organization.jobsassist. CAT. 50.com ) .asp Discuss freely every thing on earth to the greatest possible depth at www.com/careermag © JobsAssist.com FREE Bonus .com FREE Download 20.com (www.vyomlinks. 49.com ) and VyomWorld.discussionsworld. What has been your biggest professional disappointment? Be sure that you refer to something that was beyond your control.com/itdirectory Submit your Resume to 6000+ companies at one GO at www. MCSD.com Get Complete set of Placement papers of all companies & Software jobs FREE at www. Show acceptance and no negative feelings. MCSE. How soon will I be able to be productive? and What type of projects will I be able to assist on? are examples.com Take Free Online Exams/Mock exams for GRE.jobsassist. GATE.vyomworld. C++. Do you have any questions for me? Always have some questions prepared.com Get your FREE dose of Fresher/Experienced Jobs direct to your mail box at www. 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