DataStage面试内容
数据岗位招聘面试题与参考回答(某大型集团公司)
招聘数据岗位面试题与参考回答(某大型集团公司)面试问答题（总共10个问题）第一题题目：请简要描述您对数据岗位的理解，以及您认为自己具备哪些与数据岗位相关的技能和经验？答案：1.理解描述：•数据岗位，顾名思义，是指专门负责数据收集、整理、分析、处理和解读的岗位。
它要求从业者不仅要有扎实的数据分析能力，还要具备良好的数据敏感度和逻辑思维能力。
•在我看来，数据岗位不仅仅是简单地处理数据，更是通过数据来发现规律、预测趋势、辅助决策的重要角色。
它需要将数据转化为有价值的信息，从而为企业的战略规划和运营管理提供支持。
2.相关技能和经验：•数据分析技能：熟练掌握Excel、SQL、Python等数据分析工具，能够进行数据清洗、整理、分析和可视化。
•编程能力：具备一定的编程基础，能够使用Python、R等编程语言进行数据挖掘和机器学习。
•统计学知识：了解统计学的基本原理和方法，能够运用统计模型进行数据分析和预测。
•逻辑思维：具备良好的逻辑思维能力，能够从海量数据中提炼出有价值的信息。
•沟通能力：能够清晰、准确地表达分析结果，为决策者提供有针对性的建议。
解析：这道题目考察应聘者对数据岗位的理解程度以及自身技能和经验的匹配度。
在回答时，应聘者应首先阐述自己对数据岗位的理解，然后结合自己的实际情况，详细列举自己具备的相关技能和经验。
以下是一些回答时的注意事项：1.结合自身情况：回答时，要结合自己的实际经验，避免空洞的理论描述。
2.突出重点：在列举技能和经验时，要突出与数据岗位相关的关键能力，如数据分析、编程、统计学等。
3.具体实例：可以结合具体的项目或案例，展示自己运用相关技能解决问题的能力。
4.持续学习：强调自己对于新技能和知识的持续学习态度，以适应不断变化的数据岗位需求。
第二题题目：请描述一下您在数据分析项目中遇到过的一个挑战，以及您是如何解决这个挑战的。
答案：在之前的一个数据分析项目中，我面临的挑战是处理一个包含大量缺失值的数据集。
ibm公司面试题
ibm公司面试题1、 Data Stage 分为几个部分（组件），各部分的功能是什么? Administrator – add/delete projects, set defaults Manager – import meta data, backup projects Designer – assemble jobs, compile, and execute Di rector – execute jobs, examine job run logs2、 Parallel job 和sequence job 的区别？（What is difference between Parallel job and Sequence job）Basic difference is server job runs on windows platform usually and paral lel job runs on UNIX platform.server job runs on one node whereas parallel job runs on more than one 3、在stage中会有虚线分为哪两种，有什么作用？在stage中有两种虚线参考（reference link）:以它所连接的文件作参考拒绝(rejects link):把不满足条件的输出到另一个文件4、 Partition和pipeline的概念？DataStage中有两种实现并行的方法，一种是分区(partitioning)，另一种则是管道(pipeline)。
所谓分区，是指将输入的数据按照某种规则，分成大小尽量相等的多块数据，每块数据都可以由一行节点并行读取，这样就实现了并行。
有以下几类：Round robin循环分区随机（Random） Same分区完全分区（Entire） Auto分区 hash分区 modulus分区 DB2分区而所谓管道，则是指一条数据在被一个stage处理完成后，立即被输出到一条管道（pipeline）中，下一个stage也立即读取这条管道中的数据进行操作，再一个stage也是如此，一直到最后一个stage。
数据产品经理岗位面试题及答案(经典版)
数据产品经理岗位面试题及答案1.请解释数据产品经理的角色和主要职责是什么？答：数据产品经理负责规划、开发和管理数据驱动的产品，包括数据收集、分析和应用。
他们需要理解市场需求、制定产品策略、与跨职能团队协作，并确保产品在市场上成功推出和维护。
2.请分享一个您成功推出的数据产品的案例，包括产品的目标、策略和结果。
答：在上一家公司，我成功推出了一个数据驱动的市场分析工具。
我们的目标是为市场营销团队提供更多的数据支持，以改善广告投放策略。
我制定了产品策略，包括数据源整合、分析模型开发和用户友好的界面设计。
最终，我们的产品帮助提高了广告点击率，增加了销售收入。
3.如何确定一个数据产品的目标受众？答：确定目标受众需要深入了解市场需求和业务目标。
这包括与销售、市场和客户支持团队合作，了解他们的需求和反馈。
我还会进行市场调研，分析竞争对手的目标受众，并使用用户调查和数据分析来确定最适合的目标受众。
4.数据产品经理如何管理产品路线图和优先级？答：管理产品路线图和优先级需要综合考虑多个因素。
我会与高管、开发团队和市场团队进行定期沟通，了解他们的需求和建议。
然后，我会根据公司战略目标、市场需求和技术可行性来制定路线图，并定期更新以反映新的信息和变化。
5.请描述一个您在协调跨部门团队合作方面的成功经验。
答：在上一家公司，我负责协调数据科学、工程、市场和销售团队的合作，以推出一款新的数据产品。
我建立了清晰的沟通渠道，定期召开会议，确保团队了解彼此的工作，共同解决问题，并推动项目顺利完成。
6.数据产品经理如何识别和满足用户需求？答：识别和满足用户需求是关键。
我会进行用户研究，包括用户访谈和调查，以深入了解他们的需求和痛点。
我还会分析用户行为数据，以发现潜在的机会和问题。
最重要的是，我会与用户保持持续的沟通，以了解他们的反馈并不断改进产品。
7.如何评估一个数据产品的成功？答：评估数据产品的成功需要依赖一系列指标，如用户参与度、收入增长、市场份额、用户满意度、ROI等。
datastage面试300题
1. What are the Environmental variables in Datastage?2. Check for Job Errors in datastage3. What are Stage V ariables, Derivations and Constants?4. What is Pipeline Parallelism?5. Debug stages in PX6. How do you remove duplicates in dataset7. What is the difference between Job Control and Job Sequence8. What is the max size of Data set stage?9. performance in sort stage10. How to develop the SCD using LOOKUP stage?12. What are the errors you expereiced with data stage13. what are the main diff between server job and parallel job in datastage14. Why you need Modify Stage?15. What is the difference between Squential Stage & Dataset Stage. When do u use them.16. memory allocation while using lookup stage17. What is Phantom error in the datastage. How to overcome this error.18. Parameter file usage in Datastage19. Explain the best approch to do a SCD type2 mapping in parallel job?20. how can we improve the performance of the job while handling huge amount of data21. HI How can we create read only jobs in Datastage.22. how to implement routines in data stage,have any one has any material for data stage23. How will you determine the sequence of jobs to load into data warehouse?24. How can we Test jobs in Datastage??25. DataStage - delete header and footer on the source sequential26. How can we implement Slowly Changing Dimensions in DataStage?.27. Differentiate Database data and Data warehouse data?28. How to run a Shell Script within the scope of a Data stage job?29. what is the difference between datastage and informatica30. Explain about job control language such as (DS_JOBS)32. What is Invocation ID?33. How to connect two stages which do not have any common columns between them?34. In SAP/R3, How do you declare and pass parameters in parallel job .35. Difference between Hashfile and Sequential File?36. How do you fix the error "OCI has fetched truncated data" in DataStage37. A batch is running and it is scheduled to run in 5 minutes. But after 10 days the time changes to 10 minutes. What type of error is this and how to fix it?38. Which partition we have to use for Aggregate Stage in parallel jobs ?39. What is the baseline to implement parition or parallel execution method in datastage job.e.g. more than 2 millions records only advised ?40. how do we create index in data satge?41. What is the flow of loading data into fact & dimensional tables?42. What is a sequential file that has single input link??43. Aggregators –What does the warning “Hash table has grown to …xyz‟ ….” mean?44. what is hashing algorithm?45. How do you load partial data after job failedsource has 10000 records, Job failed after 5000 records are loaded. This status of the job is abort , Instead of removing 5000 records from target , How can i resume the load46. What is Orchestrate options in generic stage, what are the option names. value ? Name of an Orchestrate operator to call. what are the orchestrate operators available in datastage for AIX environment.47. Type 30D hash file is GENERIC or SPECIFIC?48. Is Hashed file an Active or Passive Stage? When will be it useful?49. How do you extract job parameters from a file?50.1.What about System variables?2.How can we create Containers?3.How can we improve the performance of DataStage?4.what are the Job parameters?5.what is the difference between routine and transform and function?6.What are all the third party tools used in DataStage?7.How can we implement Lookup in DataStage Server jobs?8.How can we implement Slowly Changing Dimensions in DataStage?.9.How can we join one Oracle source and Sequential file?.10.What is iconv and oconv functions?51What are the difficulties faced in using DataStage ? or what are the constraints in using DataStage ?52. Have you ever involved in updating the DS versions like DS 5.X, if so tell us some the steps you have53. What r XML files and how do you read data from XML files and what stage to be used?54. How do you track performance statistics and enhance it?55. Types of vies in Datastage Director?There are 3 types of views in Datastage Director a) Job View - Dates of Jobs Compiled. b) Log View - Status of Job last run c) Status View - Warning Messages, Event Messages, Program Generated Messag56. What is the default cache size? How do you change the cache size if needed?Default cache size is 256 MB. We can incraese it by going into Datastage Administrator and selecting the Tunable Tab and specify the cache size over there.57. How do you pass the parameter to the job sequence if the job is running at night?58. How do you catch bad rows from OCI stage?59. what is quality stage and profile stage?60. what is the use and advantage of procedure in datastage?61. What are the important considerations while using join stage instead of lookups.62. how to implement type2 slowly changing dimenstion in datastage? give me with example?63. How to implement the type 2 Slowly Changing dimension in DataStage?64. What are Static Hash files and Dynamic Hash files?65. What is the difference between Datastage Server jobs and Datastage Parallel jobs?66. What is ' insert for update ' in datastage67. How did u connect to DB2 in your last project?Using DB2 ODBC drivers.68. How do you merge two files in DS?Either used Copy command as a Before-job subroutine if the metadata of the 2 files are same or created a job to concatenate the 2 files into one if the metadata is different.69. What is the order of execution done internally in the transformer with the stage editor having input links on the lft hand side and output links?70. How will you call external function or subroutine from datastage?71. What happens if the job fails at night?72. Types of Parallel Processing?Parallel Processing is broadly classified into 2 types. a) SMP - Symmetrical Multi Processing. b) MPP - Massive Parallel Processing.73. What is DS Administrator used for - did u use it?74. How do you do oracle 4 way inner join if there are 4 oracle input files?75. How do you pass filename as the parameter for a job?76. How do you populate source files?77. How to handle Date convertions in Datastage? Convert a mm/dd/yyyy format to yyyy-dd-mm? We use a) "Iconv" function - Internal Convertion. b) "Oconv" function - External Convertion. Function to convert mm/dd/yyyy format to yyyy-dd-mm is Oconv(Iconv(Filedname,"D/M78. How do you execute datastage job from command line prompt?Using "dsjob" command as follows. dsjob -run -jobstatus projectname jobname79. Differentiate Primary Key and Partition Key?Primary Key is a combination of unique and not null. It can be a collection of key values called as composite primary key. Partition Key is a just a part of Primary Key. There are several methods of80 How to install and configure DataStage EE on Sun Micro systems multi-processor hardware running the Solaris 9 operating system?Asked by: Kapil Jayne81. What are all the third party tools used in DataStage?82. How do you eliminate duplicate rows?83. what is the difference between routine and transform and function?84. Do you know about INTEGRITY/QUALITY stage?85. how to attach a mtr file (MapTrace) via email and the MapTrace is used to record all the execute map errors86. Is it possible to calculate a hash total for an EBCDIC file and have the hash total stored as EBCDIC using Datastage?Currently, the total is converted to ASCII, even tho the individual records are stored as EBCDIC.87. If your running 4 ways parallel and you have 10 stages on the canvas, how many processes does datastage create?88. Explain the differences between Oracle8i/9i?89. How will you pass the parameter to the job schedule if the job is running at night? What happens if one job fails in the night?90. what is an environment variable??91. how find duplicate records using transformer stage in server edition92. what is panthom error in data stage93. How can we increment the surrogate key value for every insert in to target database94. what is the use of environmental variables?95. how can we run the batch using command line?96. what is fact load?97. Explain a specific scenario where we would use range partitioning ?98. what is job commit in datastage?99. hi..Disadvantages of staging area Thanks,Jagan100. How do you configure api_dump102. Does type of partitioning change for SMP and MPP systems?103. what is the difference between RELEASE THE JOB and KILL THE JOB?104. Can you convert a snow flake schema into star schema?105. What is repository?106. What is Fact loading, how to do it?107. What is the alternative way where we can do job control??108.Where we can use these Stages Link Partetionar, Link Collector & Inter Process (OCI) Stage whether in Server Jobs or in Parallel Jobs ?And SMP is a Parallel or Server ?109. Where can you output data using the Peek Stage?110. Do u know about METASTAGE?111. In which situation,we are using RUN TIME COLUMN PROPAGA TION option?112. what is the difference between datasatge and datastage TX?113. 1 1. Difference between Hashfile and Sequential File?. What is modulus?2 2. What is iconv and oconv functions?.3 3. How can we join one Oracle source and Sequential file?.4 4. How can we implement Slowly Changing Dimensions in DataStage?.5 5. How can we implement Lookup in DataStage Server jobs?.6 6. What are all the third party tools used in DataStage?.7 7. what is the difference between routine and transform and function?.8 8. what are the Job parameters?.9 9. Plug-in?.10 10.How can we improv114. Is it possible to query a hash file? Justify your answer...115. How to enable the datastage engine?116. How I can convert Server Jobs into Parallel Jobs?117. Suppose you have table "sample" & three columns in that tablesample:Cola Colb Colc1 10 1002 20 2003 30 300Assume: cola is primary keyHow will you fetch the record with maximum cola value using data stage tool into the target system118. How to parametarise a field in a sequential file?I am using Datastage as ETL Tool,Sequential file as source.119. What is TX and what is the use of this in DataStage ? As I know TX stand for Transformer Extender, but I don't know how it will work and where we will used ?120. What is the difference betwen Merge Stage and Lookup Stage?121. Importance of Surrogate Key in Data warehousing?Surrogate Key is a Primary Key for a Dimension table. Most importance of using it is it is independent of underlying database. i.e Surrogate Key is not affected by the changes going on with a databas122. What is the difference between Symetrically parallel processing,Massively parallel processing?123.What is the diffrence between the Dynamic RDBMS Stage & Static RDBMS Stage ?124. How to run a job using command line?125. What is user activity in datastage?126. how can we improve the job performance?127. how we can create rank using datastge like in informatica128. What is the use of job controle??129. What does # indicate in environment variables?130. what are two types of hash files??131. What are different types of star schema??132. what are different types of file formats??133. What are different dimension table in your project??Plz explain me with an example?? 134. what is the difference between buildopts and subroutines ?135. how can we improve performance in aggregator stage??136. What is SQL tuning? how do you do it ?137. What is the use of tunnable??138. how to distinguish the surogate key in different dimensional tables?how can we give for different dimension tables?139. how can we load source into ODS?140. What is the difference between sequential file and a dataset? When to use the copy stage?141. how to eleminate duplicate rows in data stage?142. What is complex stage? In which situation we are using this one?143. What is the sequencer stage??144. where actually the flat files store?what is the path?145. what are the different types of lookups in datastage?146. What are the most important aspects that a beginner must consider doin his first DS project ?147. how to find errors in job sequence?148. it is possible to access the same job two users at a time in datastage?149. how to kill the job in data stage?150. how to find the process id?explain with steps?151. Why job sequence is use for? what is batches?what is the difference between job sequence and batches?152. What is Integrated & Unit testing in DataStage ?153. What is iconv and oconv functions?154. For what purpose is the Stage Variable is mainly used?155. purpose of using the key and difference between Surrogate keys and natural key156. how to read the data from XL FILES?my problem is my data file having some commas in data,but we are using delimitor is| ?how to read the data ,explain with steps?157. How can I schedule the cleaning of the file &PH& by dsjob?158. Hot Fix for ODBC Stage for AS400 V5R4 in Data Stage 7.1159. what is data stage engine?what is its purpose?160. What is the difference between Transform and Routine in DataStage?161. what is the meaning of the following..1)If an input file has an excessive number of rows and can be split-up then use standard 2)logic to run jobs in parallel3)Tuning should occur on a job-by-job basis. Use the power of DBMS.162. Why is hash file is faster than sequential file n odbc stage??163. Hello,Can both Source system(Oracle,SQLServer,...etc) and Target Data warehouse(may be oracle,SQLServer..etc) can be on windows environment or one of the system should be in UNIX/Linux environment.Thanks,Jagan164. How to write and execute routines for PX jobs in c++?165. what is a routine?166. how to distinguish the surrogate key in different dimentional tables?167. how can we generate a surrogate key in server/parallel jobs?168. what is NLS in datastage? how we use NLS in Datastage ? what advantages in that ? at thetime of installation i am not choosen that NLS option , now i want to use that options what can i do ? to reinstall that datastage or first uninstall and install once again ?169. how to read the data from XL FILES?explain with steps?170. whats the meaning of performance tunning techinque,Example??171. differentiate between pipeline and partion parallelism?172. What is the use of Hash file??insted of hash file why can we use sequential file itself?173. what is pivot stage?why are u using?what purpose that stage will be used?174. How did you handle reject data?175. Hiwhat is difference betweend ETL and ELT?176. how can we create environment variables in datasatage?177. what is the difference between static hash files n dynamic hash files?178. how can we test the jobs?179. What is the difference between reference link and straight link ?180. What are the command line functions that import and export the DS jobs?181. what is the size of the flat file?182. Whats difference betweeen operational data stage (ODS) & data warehouse?183. I have few questions1. What ar ethe various process which starts when the datastage engine starts?2. What are the changes need to be done on the database side, If I have to use dB2 stage?3. datastage engine is responsible for compilation or execution or both?184. Could anyone plz tell abt the full details of Datastage Certification.Title of Certification?Amount for Certification test?Where can v get the Tutorials available for certification?Who is Conducting the Certification Exam?Whether any training institute or person for guidens?I am very much pleased if anyone enlightwn me abt the above saidSuresh185. how to use rank&updatestratergy in datastage186. What is Ad-Hoc access? What is the difference between Managed Query and Ad-Hoc access?187. What is Runtime Column Propagation and how to use it?188. how we use the DataStage Director and its run-time engine to schedule running the solution, testing and debugging its components, and monitoring the resulting e/xecutable versions on ad hoc or scheduled basis?189. What is the difference bitween OCI stage and ODBC stage?190. Is there any difference b/n Ascential DataStage and DataStage.191. How do you remove duplicates without using remove duplicate stage?192. if we using two sources having same meta data and how to check the data in two sorces is same or nif we using two sources having same meta data and how to check the data in two sorces is same or not?and if the data is not same i want to abort the job ?how we can do this?193. If a DataStage job aborts after say 1000 records, how to continue the job from 1000th record after fixing the error?194. Can you tell me for what puorpse .dsx files are used in the datasatage195. how do u clean the datastage repository.196. give one real time situation where link partitioner stage used?197. What is environment variables?what is the use of this?198. How do you call procedures in datastage?199. How to remove duplicates in server job200. What is the exact difference betwwen Join,Merge and Lookup Stage??202. What are the new features of Datastage 7.1 from datastage 6.1203. How to run the job in command prompt in unix?204. How to know the no.of records in a sequential file before running a server job?205. Other than Round Robin, What is the algorithm used in link collecter? Also Explain How it will works?206. how to drop the index befor loading data in target and how to rebuild it in data stage?207. How can ETL excel file to Datamart?208. what is the transaction size and array size in OCI stage?how these can be used?209. what is job control?how it is developed?explain with steps?210. My requirement is like this :Here is the codification suggested: SALE_HEADER_XXXXX_YYYYMMDD.PSVSALEMy requirement is like this :Here is the codification suggested: SALE_HEADER_XXXXX_YYYYMMDD.PSVSALE_LINE_XXXXX_YYYYMMDD.PSVXXXXX = LVM sequence to ensure unicity and continuity of file exchangesCaution, there will an increment to implement.YYYYMMDD = LVM date of file creation COMPRESSION AND DELIVERY TO: SALE_HEADER_XXXXX_YYYYMMDD.ZIP AND SALE_LINE_XXXXX_YYYYMMDD.ZIPif we run that job the target file names are like this sale_header_1_20060206 & sale_line_1_20060206.If we run next time means the211. what is the purpose of exception activity in data stage 7.5?212. How to implement slowly changing dimentions in Datastage?213. What does separation option in static hash-file mean?214. how to improve the performance of hash file?215. Actually my requirement is like that :Here is the codification suggested: SALE_HEADER_XXXXX_YYYYMMActually my requirement is like that :Here is the codification suggested: SALE_HEADER_XXXXX_YYYYMMDD.PSVSALE_LINE_XXXXX_YYYYMMDD.PSVXXXXX = LVM sequence to ensure unicity and continuity of file exchangesCaution, there will an increment to implement.YYYYMMDD = LVM date of file creation COMPRESSION AND DELIVERY TO: SALE_HEADER_XXXXX_YYYYMMDD.ZIP AND SALE_LINE_XXXXX_YYYYMMDD.ZIPif we run that job the target file names are like this sale_header_1_20060206 & sale_line_1_20060206.if we run next216. How do u check for the consistency and integrity of model and repository?217. how we can call the routine in datastage job?explain with steps?218. what is job control?how can it used explain with steps?219. how to find the number of rows in a sequential file?220. If the size of the Hash file exceeds 2GB..What happens? Does it overwrite the current rows?221. where we use link partitioner in data stage job?explain with example?222 How i create datastage Engine stop start script.Actually my idea is as below.!#bin/bashdsadm - usersu - rootpassword (encript)DSHOMEBIN=/Ascential/DataStage/home/dsadm/Ascential/DataStage/DSEngine/binif check ps -ef | grep DataStage (client connection is there) { kill -9 PID (client connection) }uv -admin - stop > dev/nulluv -admin - start > dev/nullverify processcheck the connectionecho "Started properly"run it as dsadm223. can we use shared container as lookup in datastage server jobs?224. what is the meaning of instace in data stage?explain with examples?225. wht is the difference beteen validated ok and compiled in datastage.226. hi all what is auditstage,profilestage,qulaitystages in datastge please explain indetail227what is PROFILE STAGE , QUALITY STAGE,AUDIT STAGE in datastage..please expalin in detail.thanks in adv228. what are the environment variables in datastage?give some examples?229. What is difference between Merge stage and Join stage?230. Hican any one can explain what areDB2 UDB utilitiesub231. What is the difference between drs and odbc stage232. Will the data stage consider the second constraint in the transformer once the first condition is satisfied ( if the link odering is given)233. How do you do Usage analysis in datastage ?234. how can u implement slowly changed dimensions in datastage? explain?2) can u join flat file and database in datastage?how?235. How can you implement Complex Jobs in datastage236. DataStage from Staging to MDW is only running at 1 row per second! What do we do to remedy?237. what is the mean of Try to have the constraints in the 'Selection' criteria of the jobs iwhat is the mean of Try to have the constraints in the 'Selection' criteria of the jobs itself. This will eliminate the unnecessary records even getting in before joins are made?238. * What are constraints and derivation?* Explain the process of taking backup in DataStage?*What are the different types of lookups available in DataStage?239. # How does DataStage handle the user security?240. What are the Steps involved in development of a job in DataStage?241. What is a project? Specify its various components?242. What does a Config File in parallel extender consist of?Config file consists of the following. a) Number of Processes or Nodes. b) Actual Disk Storage Location.243. how to implement type2 slowly changing dimensions in data stage?explain with example?244. How much would be the size of the database in DataStage ?What is the difference between Inprocess and Interprocess ?245. Briefly describe the various client components?246. What are orabulk and bcp stages?247. What is DS Director used for - did u use it?248. what is meaning of file extender in data stage server jobs.can we run the data stage job from one job to another job that file data where it is stored and what is the file extender in ds jobs.249. What is the max capacity of Hash file in DataStage?250. what is merge and how it can be done plz explain with simple example taking 2 tables .......251. it is possible to run parallel jobs in server jobs?252. what are the enhancements made in datastage 7.5 compare with 7.0253. If I add a new environment variable in Windows, how can I access it in DataStage?254. what is OCI?255. Is it possible to move the data from oracle ware house to SAP Warehouse using withDA TASTAGE Tool.256. How can we create Containers?257. what is data set? and what is file set?258. How can I extract data from DB2 (on IBM iSeries) to the data warehouse via Datastage as the ETL tool. I mean do I first need to use ODBC to create connectivity and use an adapter for the extraction and transformation of data? Thanks so much if anybody could provide an answer.259. it is possible to call one job in another job in server jobs?260. how can we pass parameters to job by using file.261. How can we implement Lookup in DataStage Server jobs?262. what user varibale activity when it used how it used !where it is used with real example263. Did you Parameterize the job or hard-coded the values in the jobs?Always parameterized the job. Either the values are coming from Job Properties or from a …Parameter Manager‟ – a third part tool. There is no way you will hard–code some parameters in your jobs. The o264. what is hashing algorithm and explain breafly how it works?265. what happends out put of hash file is connected to transformer ..what error it throughs266. what is merge ?and how to use merge? merge is nothing but a filter conditions that have been used for filter condition267. What will you in a situation where somebody wants to send you a file and use that file as an input What will you in a situation where somebody wants to send you a file and use that file as an input or reference and then run job.268. What is the NLS equivalent to NLS oracle code American_7ASCII on Datastage NLS?269. Why do you use SQL LOADER or OCI STAGE?270. What about System variables?271. what are the differences between the data stage 7.0 and 7.5in server jobs?272. How the hash file is doing lookup in serverjobs?How is it comparing the key values?273. how to handle the rejected rows in datastage?274. how is datastage 4.0 functionally different from the enterprise edition now?? what are the exact changes?275. What is Hash file stage and what is it used for?Used for Look-ups. It is like a reference table. It is also used in-place of ODBC, OCI tables for better performance.276. What is the utility you use to schedule the jobs on a UNIX server other than using Ascential Director?Use crontab utility along with d***ecute() function along with proper parameters passed.277. How can I connect my DB2 database on AS400 to DataStage? Do I need to use ODBC 1st to open the database connectivity and then use an adapter for just connecting between the two? Thanks alot of any replies.278. what is the OCI? and how to use the ETL Tools?OCI means orabulk data which used client having bulk data its retrive time is much more ie., your used to orabulk data the divided and retrived Asked by: ramanamv279. what is difference between serverjobs & paraller jobs280. What is the difference between Datastage and Datastage TX?281. Hi!Can any one tell me how to extract data from more than 1 hetrogenious Sources.mean, example 1 sequenal file, Sybase , Oracle in a singale Job.282. How can we improve the performance of DataStage jobs?283. How good are you with your PL/SQL?On the scale of 1-10 say 8.5-9284. What are OConv () and Iconv () functions and where are they used?IConv() - Converts a string to an internal storage formatOConv() - Converts an expression to an output format.285. If data is partitioned in your job on key 1 and then you aggregate on key 2, what issues could arise?286. How can I specify a filter command for processing data while defining sequential file output data?287. There are three different types of user-created stages available for PX. What are they? Which would you use? What are the disadvantage for using each type?288. What is DS Manager used for - did u use it?289. What are Sequencers?Sequencers are job control programs that execute other jobs with preset Job parameters.290. Functionality of Link Partitioner and Link Collector?291. Containers : Usage and Types?Container is a collection of stages used for the purpose of Reusability. There are 2 types of Containers. a) Local Container: Job Specific b) Shared Container: Used in any job within a project.292. Does Enterprise Edition only add the parallel processing for better performance?Are any stages/transformations available in the enterprise edition only?293. what are validations you perform after creating jobs in designer.what r the different type of errors u faced during loading and how u solve them294. how can you do incremental load in datastage?295. how we use NLS function in Datastage? what are advantages of NLS function? where we can use that one? explain briefly?296. Dimension Modelling types along with their significanceData Modelling is Broadly classified into 2 types. a) E-R Diagrams (Entity - Relatioships). b) Dimensional Modelling.297. Did you work in UNIX environment?Yes. One of the most important requirements.298. What other ETL's you have worked with?Informatica and also DataJunction if it is present in your Resume.299. What is APT_CONFIG in datastage300. Does the BibhudataStage Oracle plug-in better than OCI plug-in coming from DataStage? What is theBibhudataStage extra functions?301. How do we do the automation of dsjobs?302. what is trouble shhoting in server jobs ? what are the diff kinds of errors encountered while。
大数据开发工程师面试题
大数据开发工程师面试题面试题一：大数据开发工程师的职责和技能要求（500字）大数据开发工程师是一种在当前互联网和信息时代中需求量不断增长的热门职位。
作为一个大数据开发工程师，您将负责处理和分析大规模的数据集，提取有价值的信息和洞察，并为企业和组织的决策提供支持。
同时，您还需要具备丰富的技能和知识，以应对复杂的数据工作环境。
一、职责:大数据开发工程师的主要职责包括以下几个方面：1. 数据收集和清洗：负责从各种数据源中收集和提取数据，同时对数据进行清洗、转换和预处理，以确保数据质量和可靠性。
2. 数据存储和管理：负责设计和维护数据存储架构，选择合适的数据库和数据仓库，以存储和管理大规模的数据集。
3. 数据处理和分析：使用相关的大数据处理工具和技术，如Hadoop、Spark等，进行数据的处理和分析，以挖掘数据中的价值和洞察。
4. 数据可视化和报告：将分析结果进行可视化展示，并撰写相应的报告和文档，以便业务部门理解和利用数据。
5. 数据安全和隐私保护：确保数据在收集、存储、处理和传输过程中的安全性和隐私保护，合规各项法规要求。
二、技能要求：作为一名大数据开发工程师，需要具备以下关键技能和知识：1. 编程技能：熟练掌握一门或多门编程语言，如Java、Python、Scala等，能够编写高效和可维护的代码。
2. 大数据处理工具和框架：熟悉并使用过Hadoop、Spark等大数据处理工具和框架，对它们的原理和应用有深入理解。
3. 数据库和SQL：熟悉常见的关系型数据库，如MySQL、Oracle 等，并具备良好的SQL编程能力，能够进行复杂的数据查询和操作。
4. 数据仓库和数据模型：了解数据仓库的概念和设计原则，熟悉常用的数据建模方法和技术，如星型模型和雪花模型等。
5. 统计和机器学习：具备基本的统计学知识和机器学习算法，能够运用统计方法和机器学习技术对数据进行分析和建模。
6. 分布式系统和并行计算：了解分布式系统的原理和设计思想，熟悉并行计算的概念和技术，能够优化大数据处理和分析的性能。
25题游戏数据分析岗位常见面试问题含HR问题考察点及参考回答
25题游戏数据分析岗位常见面试问题含HR问题考察点及参考回答在游戏行业中，数据分析岗位扮演着重要的角色，帮助游戏公司了解玩家行为、优化游戏体验以及提升游戏收益。
作为一名求职者，面试是获得这一岗位的关键步骤。
在游戏数据分析岗位的面试中，HR可能会提出以下25个常见问题，下面我们将逐一介绍这些问题，并给出参考答案。
1. 请简单介绍一下你的数据分析经验。
参考回答：我拥有X年的数据分析经验，曾在ABC公司担任数据分析员，负责游戏玩家数据的收集、分析和报告。
我熟练运用SQL、Python和数据可视化工具进行数据处理和分析，并能提供有助于业务增长和改进的洞察。
2. 你认为数据分析在游戏行业中的重要性是什么？参考回答：数据分析在游戏行业中扮演着至关重要的角色。
通过分析玩家行为和游戏数据，我们可以了解玩家的需求、优化游戏体验、改进游戏机制，并制定相应的市场策略，提升游戏的竞争力和盈利能力。
3. 请介绍一下你在数据分析中使用的主要工具和技术。
参考回答：我熟练掌握SQL用于数据提取和处理，能够使用Python进行数据清洗和建模，以及使用数据可视化工具如Tableau呈现分析结果。
另外，我也具备数据挖掘和机器学习的基础知识。
4. 如何确定有效的数据指标来评估游戏的成功与否？参考回答：确定有效的数据指标需要从游戏目标出发，如用户留存率、付费率、收入等。
另外，根据游戏特性，可以选择一些特定的指标，如道具销售数量、游戏关卡通关率等。
通过数据分析，结合业务目标和游戏特性，我们可以确定合适的指标以评估游戏的成功与否。
5. 你如何保证数据分析的准确性和可靠性？参考回答：保证数据分析的准确性和可靠性有几个方面。
首先，数据采集过程要保证准确性，避免数据收集的偏差。
其次，在数据处理和清洗过程中，要排除异常值和错误数据。
最后，在分析阶段，要使用科学的方法和合适的统计模型，以确保分析结果的可靠性。
6. 在数据分析中，你如何处理大量数据？参考回答：处理大量数据时，我首先会使用合适的数据库技术如分布式数据库或者数据仓库进行存储和查询。
数据岗位招聘面试题与参考回答
招聘数据岗位面试题与参考回答面试问答题（总共10个问题）第一题题目：请您描述一下您对数据分析师这一岗位的理解，以及您认为作为一名优秀的数据分析师应该具备哪些核心能力？答案：作为一名数据分析师，我认为我的主要职责是从大量数据中提取有价值的信息，通过数据挖掘、统计分析等方法，帮助公司或团队做出更加明智的决策。
以下是我认为优秀的数据分析师应具备的核心能力：1.数据分析技能：熟练掌握至少一种数据分析软件（如Excel、SPSS、R、Python等），能够进行数据清洗、数据预处理、数据分析、数据可视化等工作。
2.统计知识：具备扎实的统计学基础，能够正确运用各种统计方法，如描述性统计、推断性统计、假设检验等。
3.业务理解：对所从事的行业有深入的理解，能够将数据分析与业务需求相结合，提出有针对性的分析建议。
4.沟通能力：能够清晰、准确地表达分析结果，无论是通过书面报告还是口头汇报，都要确保信息传递的有效性。
5.解决问题的能力：面对复杂的问题时，能够运用逻辑思维和创造性思维找到解决方案。
6.持续学习：数据分析和统计方法在不断进步，优秀的数据分析师应具备持续学习的态度，不断更新自己的知识库。
解析：这一题旨在考察应聘者对数据分析师岗位的理解程度，以及对所需能力的自我评估。
优秀的数据分析师不仅需要具备扎实的技术能力，还需要具备良好的业务敏感度和沟通技巧。
答案中提到的各项能力都是数据分析师岗位的关键要求，通过这样的回答，面试官可以初步判断应聘者的专业背景和综合素质。
第二题题目：请描述一下您在过去的工作或项目中，如何处理过一次数据清洗的难题？您遇到了哪些挑战，又是如何克服这些挑战的？答案：在过去的一个项目中，我负责对一家大型电商平台的用户数据进行清洗和分析。
在数据清洗过程中，我遇到了以下挑战：1.数据质量问题：原始数据中存在大量的缺失值、异常值和重复数据。
2.数据格式不一致：不同来源的数据格式不统一，给数据整合带来了困难。
数据仓库面试题
数据仓库面试题一、简介数据仓库是一个用于存储和管理大量数据的系统，被广泛应用于数据分析和决策支持领域。
在数据仓库领域的面试中，涉及到的题目通常围绕数据仓库的架构、设计、模型、ETL流程、性能优化等方面展开。
本文将针对数据仓库面试常见的题目进行一一解答。
二、题目解答1. 请介绍数据仓库的架构。
数据仓库的架构通常包括三层：数据源层、集成层和展示层。
数据源层是指数据仓库的原始数据来源，可以是各种业务系统中的数据库、文件、API等。
集成层负责对数据进行抽取、转换和加载（ETL）的过程，将原始数据转化为适合分析和查询的形式。
展示层是数据仓库最终呈现给用户的部分，一般使用OLAP数据模型，支持多维分析和报表功能。
2. 请介绍数据仓库的设计原则。
数据仓库的设计原则主要包括可理解性、稳定性、高性能和易扩展性。
可理解性要求数据仓库的模型和数据应该能够被用户清晰地理解和操作，遵循一致的命名规范和约定。
稳定性要求数据仓库的结构和数据应该是可靠的，能够保证数据的完整性和准确性。
高性能要求数据仓库在查询和分析时能够快速响应，通常通过索引、分区等技术来实现。
易扩展性要求数据仓库能够方便地扩展和增加新的数据源，以适应业务发展和数据增长的需求。
3. 什么是星型模型和雪花模型？星型模型和雪花模型是常见的数据仓库设计模型。
星型模型以一个中心的事实表（Fact Table）为核心，与多个维度表（Dimension Table）关联。
事实表中包含了事实（例如销售量、金额等）以及用于关联维度表的外键。
维度表包含了与事实表相关的维度（例如时间、产品、地区等），每个维度表都有一个与之关联的主键。
星型模型简单、直观，易于理解和查询。
雪花模型在星型模型的基础上进行了拓展，将维度表进一步规范化，使得维度间可以建立更多层级的关联。
即维度表可以再次分解成更小的维度表。
这样做可以提高数据的一致性和准确性，但同时也增加了模型的复杂性。
4. 请解释OLAP和OLTP的区别。
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经验
非常有限
在有协助的情况下，在多种场合运作，在例行情况下独立运作过
重复的
成功的
有效的
资深的
DW架构
DataStage架构
组件功能
常用Stage及特性
分区原理
数据模型
ETL开发
问题解决
Job ቤተ መጻሕፍቲ ባይዱequence
Moia调度器
相关ETL技能
（注：请把测试分数转换成百分制，满分100分。）
面试技术：DataStage
姓名：
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熟练
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只有一般，概念性的知识，只能有限地完成工作
有实践方面的知识，能较独立地完成工作
有独立运作的知识，能触类旁通，可以成功地胜任大部分工作
是否需要其他测试：□是测试项：测试成绩：□否
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不能准确而周密地考虑事物发生的原因，或者不能根据已有的经验或知识对当前所面临的问题作出正确的判断。
将一个复杂的问题分解成不同的部分，使之更容易把握；根据经验和常识迅速发现问题的实质。
发现事件的多种可能的原因和行为的不同后果，或找出复杂事物之间的联系。
恰当地运用已有的概念，方法，技术等多种手段找出最有效的解决问题的方法。
服务
意识
缺乏满足客户的需求的愿望和态度
与客户保持沟通，跟踪了解客户的问题、要求和不满。
对客户的问题作出快速的反应。
了解客户的潜在需求并为客户的利益发展提供建议。
主动性
不会自觉地完成工作任务，需要他人的督促。不能提前计划或思考问题，直到问题发生后才能意识到事情的严重性
自觉投入更多的努力去从事工作
及时发现某种机遇或问题，并快速作出行动
提前行动，以便创造机会或避免问题发生
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