20 data integration interview questions and answers

It goes without saying that in order to ace your upcoming job interview, you must first ensure that your credentials are deserving. However, there are other things you can do to improve your chances. Being prepared is just as important as being knowledgeable.

In this context, we’re talking about being prepared for the interview questions you’ll almost certainly be asked. If you don’t know how to use your knowledge, it won’t be worth a thing. Knowing what questions to expect allows you to study the material and prepare the best possible responses.

We will therefore highlight the most frequently asked data modeling interview questions today. We will begin with simple inquiries and progress through simple, intermediate, and advanced inquiries.

But first, let’s consider the questions by first asking, “What is a data model?”

Top 20 Data Entry Interview Questions and Answers for 2022

The process of combining data from various sources into a single repository is known as data integration. Businesses must follow this procedure in order to make decisions that are based on accurate and current information. Expect to be questioned about your background and expertise in data integration during an interview for a position that requires these abilities. The most typical data integration interview queries are covered in this article, along with tips on how to respond to them.

Although there are many different types of data sources, some typical ones are databases, spreadsheets, text files, and web services. You will need to use a tool that can extract the data from the sources and then transform it into a format that the target system can use in order to integrate these data sources.

The process of performing a data migration operation consists of a few crucial steps. The first step is to evaluate the data you already have and decide what needs to be migrated. The source and destination systems must be connected in the second step. The third step is moving the data from the source to the destination. The last step is to ensure that the data migration was successful.

There are also some disadvantages to using a NoSQL database. One is that they sometimes make queries more challenging than with an RDBMS. This is because it can be challenging to run complex queries because the data is frequently dispersed across multiple servers. Since there is no assurance that all of the data will be stored on all of the servers, NoSQL databases may be less reliable than RDBMSs.

Utilizing an enterprise service bus can offer a centralized location for managing data integration, which is its main benefit. This may make it simpler to keep an eye on and manage the data flow between various systems. The drawback is that setting up and maintaining an enterprise service bus can be challenging, and it might not always be the best option for solving data integration problems.

If you are a technical professional who is also knowledgeable about management and operations, you can pursue a successful career as an integration analyst. With the use of computer technology in business operations, the demand for qualified Integration Analysts is steadily rising. You can find information on the www about the necessary skills, educational requirements, training facilities, and job prospects. wisdomjobs. com page. Additionally, details about the tasks carried out by an integration analyst to achieve organizational goals are provided here. Look through the wisdomjobs page to identify the ideal position for you and learn how to apply for it. In order to help you prepare for the crucial interview that will help you land your dream job, our experts have created a few Integration Analyst job interview questions and answers.

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  • 20 data integration interview questions and answers

    Talend Interview Questions and Answers | Talend Online Training | Talend Tutorial | Edureka This Edureka video on Talend Interview Questions will help you to learn about the most frequently asked Talend questions and their answers which will set you apart in the interview process.

  • Why use Talend over other ETL tools available in the market.

    Following are few of the advantages of Talend:

    Features Of Talend ETL Tool

    Feature Description
    Faster Talend automates the tasks and further maintains them for you.
    Less Expense Talend provides open source tools which can be downloaded free of cost. Moreover, as the processes speed up, the developer rates are reduced as well.
    Future Proof Talend is comprised of everything that you might need to meet the marketing requirements today as well as in the future.
    Unified Platform Talend meets all of our needs under a common foundation for the products based on the needs of the organization.
    Huge Community Being open source, it is backed up by a huge community.
  • What Is Talend?

    Talend is an open source software integration platform/vendor.

    • It offers data integration and data management solutions.
    • This business offers a variety of integration tools and services for enterprise applications, big data, cloud storage, data management, master data management, and data quality.
    • But Talend’s first product i. e. More commonly known as Talend, Open Studio for Data Integration by Talend
  • What is Talend Open Studio?

    Talend Open Studio is an open source project that is based on Eclipse RCP. It supports ETL oriented implementations and is generally provided for the on-premises deployment. This acts as a code generator which produces data transformation scripts and underlying programs in Java. It provides an interactive and user-friendly GUI which lets you access the metadata repository containing the definition and configurations for each process performed in Talend.

  • What is a project in Talend?

    ‘Project’ is the highest physical structure which bundles up and stores all types of Business Models, Jobs, metadata, routines, context variables or any other technical resources.

  • Describe a Job Design in Talend.

    A Job is a basic executable unit of anything that is built using Talend. It is technically a single Java class which defines the working and scope of information available with the help of graphical representation. It implements the data flow by translating the business needs into code, routines, and programs.

  • What is a ‘Component’ in Talend?

    A component is a functional piece which is used to perform a single operation in Talend. On the palette, whatever you can see all are the graphical representation of the components. You can use them with a simple drag and drop. At the backend, a component is a snippet of Java code that is generated as a part of a Job (which is basically a Java class). These Java codes are automatically compiled by Talend when the Job is saved.

  • Explain the various types of connections available in Talend.

    Connections in Talend define whether the data has to be processed, data output, or the logical sequence of a Job. Various types of connections provided by Talend are:

    1. Row: The Row connection deals with the actual data flow. Talend supports the following kinds of row connections: Main Lookup Filter Rejects ErrorRejects Output Uniques/Duplicates Multiple Input/Output
    2. Iterate: Using the Iterate connection, a loop can be run on files in a directory, on rows in a file, or on database entries.
    3. Trigger: Depending on the trigger’s nature, the Trigger connection is used to establish a dependency between Jobs or Subjobs that are triggered one after the other. Subjob Triggers OnSubjobOK OnSubjobError Run if Component Triggers OnComponentOK OnComponentError Run if These are the two general categories of trigger connections.
    4. Link: The ELT mapper component receives table schema data via the Link connection.
  • Differentiate between ‘OnComponentOk’ and ‘OnSubjobOk’.

    OnComponentOk OnSubjobOk
    1. Belongs to Component Triggers 1. Belongs to Subjob Triggers
    2. The linked Subjob starts executing only when the previous component successfully finishes its execution 2. The linked Subjob starts executing only when the previous Subjob completely finishes its execution
    3. This link can be used with any component in a Job 3. This link can only be used with the first component of the Subjob
  • Why is Talend called a Code Generator?

    Talend provides a user-friendly GUI where you can simply drag and drop the components to design a Job. When the Job is executed, Talend Studio automatically translates it into a Java class at the backend. Each component present in a Job is divided into three parts of Java code (begin, main and end). This is why Talend studio is called a code generator.

  • What are the various types of schemas supported by Talend?

    Some of the major types of schemas supported by Talend are:

    1. Repository Schema: Any changes made to this schema will be automatically reflected in all of the jobs using it, allowing it to be reused across numerous jobs.
    2. Generic Schema: This schema is used as a shared resource by various types of data sources and is not connected to any specific data source.
    3. Fixed Schema: These are the read-only schemas that some of the components will already have defined.
  • Explain Routines.

    Routines are the reusable pieces of Java code. Using routines you can write custom code in Java in order to optimize data processing, improve Job capacity, and extend Talend Studio features.Talend supports two types of routines:

    • System routines: You can call these read-only codes directly from any Job.
    • Routines that can be customized by users by either developing new ones or adapting existing ones are known as user routines.
  • Can you define schema at runtime in Talend?

    Schemas can’t be defined during runtime. As the schemas define the movement of data, it must be defined while configuring the components.

  • Differentiate between ‘Built-in’ and ‘Repository’.

    Built-in Repository
    1. Stored locally inside a Job 1. Stored centrally inside the Repository
    2. Can be used by the local Job only 2. Can be used globally by any Job within a project
    3. Can be updated easily within a Job 3. Data is read-only within a Job
  • What are Context Variables and why they are used in Talend?

    Context variables are the user-defined parameters used by Talend which are passed into a Job at the runtime. These variables may change their values as the Job promotes from Development to Test and Production environment. Context variables can be defined in three ways:

    1. Embedded Context Variables
    2. Repository Context Variables
    3. External Context Variables
  • Can you define a variable which can be accessed from multiple Jobs?

    Yes, you can do that by declaring a static variable within a routine. Then you need to add the setter/getter methods for this variable in the routine itself. Once done, this variable will be accessible from multiple Jobs.

  • What is a Subjob and how can you pass data from parent Job to child Job?

    A Subjob can be defined as a single component or a number of components which are joined by data-flow. A Job can have at least one Subjob. To pass a value from the parent Job to child Job you need to make use of context variables.

  • Define the use of ‘Outline View’ in TOS.

    Outline View in Talend Open Studio is used to keep the track of return values available in a component. This will also include the user-defined values configured in a tSetGlobal component.

  • Explain tMap component. List down the different functions that you can perform using it.

    tMap is one of the core components which belongs to the ‘Processing’ family in Talend. It is primarily used for mapping the input data to the output data. tMap can perform following functions:

    • Add or remove columns
    • Apply transformation rules on any type of field
    • Filter input and output data using constraints
    • Reject data
    • Multiplex and demultiplex data
    • Concatenate and interchange the data
  • Differentiate between tMap and tJoin.

    tMap tJoin
    1. It is a powerful component which can handle complicated cases 1. Can only handle basic Join cases
    2. Can accept multiple input links (one is main and rest are lookups) 2. Can accept only two input links (main and lookup)
    3. Can have more than one output links 3. Can have only two output links (main and reject)
    4. Supports multiple types of join models like unique join, first join, and all join etc. 4. Supports only unique join
    5. Supports inner join and left outer join 5. Supports only inner join
    6. Can filter data using filter expressions 6. Can’t-do so
  • What is a scheduler?

    A scheduler is a software which selects processes from the queue and loads them into memory for execution. Talend does not provide a built-in scheduler.

    Data Integration – Talend Interview Questions

  • Describe the ETL Process.

    ETL stands for Extract, Transform and Load. It refers to a trio of processes which are required to move the raw data from its source to a data warehouse, a business intelligence system, or a big data platform.

    • Accessing data from all storage systems, including RDBMS, Excel files, XML files, flat files, etc., is what this step entails.
    • Analyze and apply various functions to the entire set of data in order to transform it into the desired format in this step.
    • Load: In this step, the processed data, i. e. Using the fewest resources possible, the extracted and transformed data is then loaded into the database, which is typically the target data repository.
  • Differentiate between ETL and ELT.

    1. Data is first Extracted, then it is Transformed before it is Loaded into a target system 1. Data is first Extracted, then it is Loaded to the target systems where it is further Transformed
    2. With the increase in the size of data, processing slows down as entire ETL process needs to wait till Transformation is over 2. Processing is not dependent on the size of the data
    3. Easy to implement 3. Needs deep knowledge of tools in order to implement
    4. Doesn’t provide Data Lake support 4. Provides Data Lake support
    5. Supports relational data 5. Supports unstructured data
  • Can we use ASCII or Binary Transfer mode in SFTP connection?

    No, the transfer modes can’t be used in SFTP connections. SFTP doesn’t support any kind of transfer modes as it is an extension to SSH and assumes an underlying secure channel.

  • How do you schedule a Job in Talend?

    In order to schedule a Job in Talend first, you need to export the Job as a standalone program. Then using your OS’ native scheduling tools (Windows Task Scheduler, Linux, Cron etc.) you can schedule your Jobs.

  • Explain the purpose of tDenormalizeSortedRow.

    tDenormalizeSortedRow belongs to the ‘Processing’ family of the components. It helps in synthesizing sorted input flow in order to save memory. It combines all input sorted rows in a group where the distinct values are joined with item separators.

  • Differentiate between “insert or update” and “update or insert”.

    insert or update: In this action, first Talend tries to insert a record, but if a record with a matching primary key already exists, then it updates that record.update or insert: In this action, Talend first tries to update a record with a matching primary key, but if there is none, then the record is inserted.

  • Explain the usage of tContextLoad.

    tContextLoad belongs to the ‘Misc’ family of components. This component helps in modifying the values of the active context on the fly. Basically, it is used to load a context from a flow. It sends warnings if the parameters defined in the input are not defined in the context and also if the context is not initialized in the incoming data.

  • Discuss the difference between XMX and XMS parameters.

    XMS parameter is used to specify the initial heap size in Java whereas XMX parameter is used to specify the maximum heap size in Java.

  • What is the use of Expression Editor in Talend?

    From an Expression Editor, all the expressions like Input, Var or Output, and constraint statements can be viewed and edited easily. Expression Editor comes with a dedicated view for writing any function or transformation. The necessary expressions which are needed for the data transformation can be directly written in the Expression editor or you can also open the Expression Builder dialog box where you can just write the data transformation expressions.

  • Explain the error handling in Talend.

    There are few ways in which errors in Talend can be handled:

    • For straightforward Jobs, one can rely on Talend Open Studio’s exception-throwing mechanism, which is represented by a red stack trace in the Run View.
    • Every component and subjob is required to return a code that initiates further processing. To direct the error to an error handling procedure, use the Subjob Ok/Error and Component Ok/Error links.
    • Creating an error handling Subjob that should run whenever an error occurs is the fundamental method of handling errors.
  • Differentiate between the usage of tJava, tJavaRow, and tJavaFlex components.

    Functions tJava tJavaRow tJavaFlex
    1. Can be used to integrate custom Java code Yes Yes Yes
    2. Will be executed only once at the beginning of the Subjob Yes No No
    3. Needs input flow No Yes No
    4. Needs output flow No Only if output schema is defined Only if output schema is defined
    5. Can be used as the first component of a Job Yes No Yes
    6. Can be used as a different Subjob Yes No Yes
    7. Allows Main Flow or Iterator Flow Both Only Main Both
    8. Has three parts of Java code No No Yes
    9. Can auto propagate data No No Yes
  • How can you execute a Talend Job remotely?

    You can execute a Talend Job remotely from the command line. All you need to do is, export the job along with its dependencies and then access its instructions files from the terminal.

  • Can you exclude headers and footers from the input files before loading the data?

    Yes, the headers and footers can be excluded easily before loading the data from the input files.

  • Explain the process of resolving ‘Heap Space Issue’.

    ‘Heap Space Issue’ occurs when JVM tries to add more data into the heap space area than the space available. To resolve this issue, you need to modify the memory allocated to the Talend Studio. Then you have to modify the relevant Studio .ini configuration file according to your system and need.

  • What is the purpose of ‘tXMLMap’ component?

    This component transforms and routes the data from single or multiple sources to single or multiple destinations. It is an advanced component which is sculpted for transforming and routing XML data flow. Especially when we need to process numerous XML data sources.

    Big Data – Talend Interview Questions

  • Differentiate between TOS for Data Integration and TOS for Big Data.

    Talend Open Studio for Big Data is the superset of Talend For Data Integration. It contains all the functionalities provided by TOS for DI along with some additional functionalities like support for Big Data technologies. That is, TOS for DI generates only the Java codes whereas TOS for BD generates MapReduce codes along with the Java codes.

  • What are the various Big data technologies supported by Talend?

    In TOS for BD, the Big Data family is really very large and few of the most used technologies are:

    • Cassandra
    • CouchDB
    • Google Storage
    • HBase
    • HDFS
    • Hive
    • MapRDB
    • MongoDB
    • Pig
    • Sqoop etc.
  • How can you run multiple Jobs in parallel within Talend?

    As Talend is a java-code generator, various Jobs and Subjobs in multiple threads can be executed to reduce the runtime of a Job. Basically, there are three ways for parallel execution in Talend Data Integration:

    1. Multithreading
    2. tParallelize component
    3. Automatic parallelization
  • What are the mandatory configurations needed in order to connect to HDFS?

    In order to connect to HDFS you must provide the following details:

    • Distribution
    • NameNode URI
    • User name
  • Which service is mandatory for coordinating transactions between Talend Studio and HBase?

    Zookeeper service is mandatory for coordinating the transactions between TOS and HBase.

  • What is the name of the language used for Pig scripting?

    Pig Latin is used for scripting in Pig.

  • When do you use tKafkaCreateTopic component?

    This component creates a Kafka topic which the other Kafka components can use as well. It allows you to visually generate the command to create a topic with various properties at topic-level.

  • Explain the purpose of tPigLoad component.

    Once the data is validated, this component helps in loading the original input data to an output stream in just one single transaction. It sets up a connection to the data source for the current transaction.

  • What component do you need to use to automatically close a Hive connection as soon as the main Job finishes execution?

    Using a tPostJob and tHiveClose components you can close a Hive connection automatically.

    MCQ – Talend Interview Questions

  • In Talend Studio, where can you find the components needed to create a job?

    1. Repository
    2. Run view
    3. Designer Workspace
    4. Palette [Ans]
  • In the component view, where can you change the name of a component from?

    1. Basic settings
    2. Advanced settings
    3. Documentation
    4. View [Ans]
  • The HDFS components can only be used with Big Data batch or Big Data streaming Jobs.

    1. True
    2. False [Ans]
  • An analysis on Hive table content can be executed in which perspective of Talend Studio?

    1. Profiling [Ans]
    2. Integration
    3. Big Data
    4. Mediation
  • What does an asterisk next to the Job name signify in the design workspace?

    1. It is an active Job
    2. The Job contains unsaved changes [Ans]
    3. The job is currently running
    4. The Job contains errors
  • Suppose you have designed a Big Data batch using the MapReduce framework. Now you want to execute it on a cluster using Map Reduce. Which configurations are mandatory in the Hadoop Configuration tab of the Run view?

    1. Name Node [Ans]
    2. Data Node
    3. Resource Manager
    4. Job Tracker [Ans]
  • How to find configuration error message for a component?

    1. Right-click the component and select “Show Problems”
    2. Hover over the error symbol within the Designer view [Ans]
    3. Open the Errors view
    4. Open the Jobs view
  • What is the process of joining two input columns in the tMap configuration window?

    1. Adding a column to another input table by dragging it from the main input table [Ans]
    2. Right-clicking one column in the input table and selecting “Join”
    3. choosing “Join” from the context menu after right-clicking on two columns in two different input tables.
    4. two columns from two different input tables are selected, and they are then moved to the output table.
  • To import a file from FTP, which of the following are the mandatory components?

    1. tFTPConnection, tFTPPut
    2. tFTPConnection, tFTPFileList, tFTPGet
    3. tFTPConnection, tFTPGet [Ans]
    4. tFTPConnection, tFTPExists, tFTPGet
  • Suppose you have three Jobs of which Jobs 1 and 2 are executed parallelly. Job 3 executes only after Jobs 1 and 2 complete their execution. Which of the following components can be used to set this up?

    1. tUnite
    2. tPostJob [Ans]
    3. tRunJob
    4. tParallelize [Ans]
  • For a tFileInputDelimited component, what is the default field separator parameter?

    1. Semicolon [Ans]
    2. Pipe
    3. Comma
    4. Colon
  • While saving the changes to a tMap configuration, sometimes Talend asks you for confirmation to propagate changes. Why?

    1. The source component should have a matching schema because your changes affect the output schema.
    2. The target component should have a matching schema because your changes affect the output schema. [Ans]
    3. The source component in question should have a matching schema since your changes affect an input schema.
    4. Because your changes have not been saved yet
  • In Talend, how to add a Shape into a Business Model?

    1. Click and place it from the palette
    2. Drag it from the repository
    3. Click in the quick access toolbar
    4. Drag and drop it from the palette [Ans]
  • How do you create a row link between two components?

    1. Drag the target component onto the source component
    2. After selecting the target component with the right click, click the source component.
    3. Drag the source component onto the target component
    4. Click the row, the row type, the target component, and finally the source component with the right mouse click [Ans]
  • Talend Open Studio generates the Job documentation in which of the following format?

    1. HTML [Ans]
    2. TEXT
    3. CSV
    4. XML
  • We can directly change the generated code in Talend.

    1. True
    2. False [Ans]
  • What is the default date pattern in Talend Open Studio?

    1. MM-DD-YY
    2. DD-MM-YY [Ans]
    3. DD-MM-YYYY
    4. YY-MM-DD
  • MDM stands for

    1. Meta Data Management
    2. Mobile Device Management
    3. Master Data Management [Ans]
    4. Mock Data Management
  • In order to encapsulate and pass the collected log data to the output, which components must be used along with tLogCatcher?

    1. tWarn [Ans]
    2. tDie [Ans]
    3. tStatCatcher
    4. tAssertCatcher
  • Which component do you need to use in order to read data line by line from an input flow and store the data entries into iterative global variables?

    1. tIterateToFlow
    2. tFileList
    3. tFlowToIterate [Ans]
    4. tLoop
  • tMemorizeRows belongs to which component family in Talend?

    1. Misc [Ans]
    2. Orchestration
    3. Internet
    4. File
  • _________ is a powerful input component which holds the ability to replace a number of other components of the File family.

    1. tFileInputLDIF
    2. tFileInputRegex [Ans]
    3. tFileInputExcel
    4. tFileInputJSON
  • Which component do you need in order to prevent an unwanted commit in MySQL database?

    1. tMysqlRollback [Ans]
    2. tMysqlCommit
    3. tMysqlLookupInput
    4. tMysqlRow
  • A database connection defined in Repository can be reused by any Job within the project.

    1. True [Ans]
    2. False
  • Using which component can you integrate personalized Pig code with a Talend program?

    1. tPigCross
    2. tPigMap
    3. tPigDistinct
    4. tPigCode [Ans]
  • tKafkaOutput component receives messages serialized into which data type?

    1. byte
    2. byte[] [Ans]
    3. String[]
    4. Integer
  • Two which two component families do tHDFSProperties components belongs to?

    1. Big Data and Misc
    2. Orchestration and Big Data
    3. File and Big Data [Ans]
    4. Big Data and Internet
  • This component is used to read data from cache memory for high-speed data access

    1. tHashInput [Ans]
    2. tFileInputLDIF
    3. tHDFSInput
    4. tFileInputXML
  • Using which component you can calculate the processing time of one or more Subjobs in the main Job?

    1. tFlowMeter
    2. tChronometerStart [Ans]
    3. tFlowMeterCatcher
    4. tStatCatcher
  • tUnite component belongs which of the following two families?

    1. File and Processing
    2. Misc and Messaging
    3. Orchestration and Messaging
    4. Orchestration and Processing [Ans]
  • Using tJavaFlex how many parts of java-code you can add in your Job?

    1. One
    2. Two
    3. Three [Ans]
    4. Four
  • Course Name Date
    Talend Certification Training For Big Data Integration

    Class Starts on 21st January,2023

    21st January

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    What is data integration in SQL?

    The process of combining data from various sources into a single, unified view is known as data integration. Integration includes steps like cleansing, ETL mapping, and transformation and starts with the ingestion process.

    What is Azure data LAKE interview questions?

    Interview Questions for Azure Data Engineer – General
    • 1) What is Microsoft Azure?
    • 2) What is the primary ETL service in Azure?
    • 3) What are data masking features available in Azure?
    • 4) What is Polybase?
    • 5) What is reserved capacity in Azure?
    • 7) Explain the architecture of Azure Synapse Analytics.

    How do you pass a data analysis interview?

    Prepare to discuss business sense, soft skills, analytics, and visualization as well as technical skills. Utilize tools like Datacamp to hone technical skills, gain project experience, and study business and analytics case studies as you prepare for interviews.

    What should I prepare for data entry interview?

    Data Entry Job Interview Questions: Common Types
    • How fast and accurate are your keyboarding or typing skills? .
    • What transferable skills would you bring to this job? …
    • What data entry software or programs are you familiar with? .
    • What would you do if you were unable to complete the workload that was given to you?

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