odi interview questions

The search for the perfect candidate to fill a role in a company can be a long and arduous process. A recruiter may have to review hundreds of applications and conduct many interviews in order to find the ideal applicant. ODI interviews are refined ways of evaluating a candidate’s skills, knowledge, and experience to assess whether they will be a good fit for the job. ODI interviews are often used in the final stage of the selection process and are designed to provide more depth than traditional face-to-face interviews. In this blog post, we will discuss some of the commonly asked ODI interview questions and provide tips to help applicants prepare and perform better during the process.

• Explain what is ODI? why is it different from the other ETL tools?
• What is E-LT?
• What is Oracle Data Integration Suite?
• Does ODI support web services?
• What is a profile in ODI?
• How will you bulk load data?
• What is a Procedure?
• What is a Scenario?

Oracle Data integrator Interview Questions & Answers

Why is Oracle Data Integrator different from other ETL tools?

Because it takes a different tack than other ETL tools, Oracle Data Integrator stands out. Tell the interviewer what stood out to you from the others based on your experience using the tool. This can help them assess your experience using the tool.

As an illustration, Oracle Data Integrator differs from other E-LT tools in that it employs E-LT rather than the ETL methodology. The E-LT method does away with the need for a separate transformation server between the source and the target data server. Since the target data server doubles as a staging area and a target database, we can use its power to transform the data. The transformation logic is carried out once the data is loaded into the target database. Additionally, to meet the requirements for data quality, a suitable check knowledge module (CKM) is helpful while doing this.

What is Oracle Data Integrator (ODI)?

An E-LT tool called Oracle Data Integrator is used for swift data transfer between various systems. When you go for an interview to become an Oracle Data Integrator developer, the interviewer typically anticipates that you have a fundamental understanding of the program. Before asking more in-depth questions about this tool, they might ask this question to start the interview. In your response, briefly describe the tool and a use case.

Using Sunopsis’ Sunopsis Data Integrator as an example, Oracle purchased Sunopsis in 2006 and renamed it Oracle Data Integrator. It is an E-TL device for quick data transfers between various systems. It does away with the need for a separate transformation server between the source and the target data server. With a single license, Oracle Data Integrator combined Oracle Data Integrator and Oracle Warehouse Builder.

How do contexts work in Oracle Data Integrator?

Contexts are an integral part of the Oracle Data Integrator. You could manage teams within the business and instruct your juniors as a developer. You must effectively communicate concepts to your team. Such inquiries are an attempt by the interviewer to gauge your ability to explain complicated subjects to those who might not be familiar with the technical terms.

As an illustration, Oracle Data Integrator offers a distinctive design strategy by utilizing contexts and logical schemas. The senior developer and ODI topology manager can specify the connections, data servers, system architecture, and databases within the development team. We can use contexts to link these objects to the logical architecture objects so that other programmers can use them to make interfaces using the same logical objects in the future. According to the environment topology, Oracle Data Integrator uses the proper physical connections, databases, and tables in the interfaces.

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Q36. What is Sequence?

Ans:

A sequence is an variable automatically incremented when used. Between two uses the value is persistent.

Q37.What is User Functions?

Ans:

Customized functions or “function aliases,” for which you will define technology-dependent implementations, can be defined using user functions. They are usable in the interfaces and procedures.

Q38. What is Marker?

Ans:

Elements of a project may be flagged in order to reflect the methodology or organization of the developments.

Flags are defined using the markers. These markers are organized into groups, and can be applied to most objects in a project.

Q39. What is Context?

Ans:

A context is a set of resources allowing the operation or simulation of one or more data processing applications.

Contexts allow the same jobs (Reverse, Data Quality Control, Package, etc) to be executed on different databases and/or schemas

In Oracle Data Integrator, a context allows logical objects (logical agents, logical schemas) to be linked with physical objects (physical agents, physical schemas).

Q40. What is Sequences?

Ans:

A variable that increases each time it is used is a sequence. The value has two possible uses: it can be kept in the repository or managed in an external RDBMS table.

Oracle Data Integrator supports two types of sequences:

Standard sequences, whose last value is stored in the Repository.

Specific sequences , whose last value is stored in an RDBMS table cell. Oracle Data Integrator undertakes to read the value, to lock the row (for concurrent updates) and to update the row after the last increment.

Q41. What is Session?

Ans:

A session is an execution (of a scenario, an interface, a package or a procedure,…) undertaken by an execution agent.

A session is made up of steps which are made up of tasks.

Q42. What is Session Tasks?

Ans:

The task is the smallest execution unit. It is equivalent to a command for a procedure in a KM, a procedure, the assignment of a variable, etc.

Q43.What is difference between ODI 11g and ODI 12c?

Ans:

Interface for loading source to target

Sub Tabs:

Mapping for Loading Source to Target

Sub Tabs:

In interface we will have only one target data store

Mappings we can have more than one data store (i. e. , we can load multiple data stores simultaneously)

OWB jobs can be executed in ODI 12c

To perform Incremental and Initial Load we need to create two different interfacesTo Perform Incremental and initial Load we can accomplish with single mapping (Using Deployment Specification)

No Wallet Password

Q44. Different types of Repositories?

Ans:

They are two types of Repositories

1. Master Repository :

It holds information related to Topology and Security

2. Work Repository:

It stores information related to Designer and Operator

Q45. Different types of Work Repositories?

Ans:

They are two types of Work Repositories

Q46. What is the hierarchy of Master and Work Repositories?

Ans:

We can have one Master and ‘n’ Work repositories.

But each Work repository should be attach to only one Master Repository.

Q47. What is the difference between ETL and ELT?

Ans:

In ETL we should have Middle Tier Server Engine where as in ELT shouldn’t require Middle-Tier Server Engine.

So it reduce cost. Network traffic is more for ETL whereas for ELT less network traffic compare to ETL.

Q48. What is meant by OLAP and OLTP?

Ans:

OLAP – On-line Analytic Process – Maintain Historical Data.

OLTP – on-line Transaction Process – Daily Data (Business Data).

Q49. How many types of Navigators and their usage?

Ans:

Four Types of Navigators are available.

Designer – Development

Operator – Monitoring

Topology – Configuration

Security – Provide Security

Q50. What is significant difference between Physical Schema and Logical Schema?.

Ans:

Physical Schema = Logical Schema + Context

For Example: Consider an Organization A whose Branches are A1,A2 and A3.

Consider the Structure of A1,A2 and A3 Schema’s are same but located in different Servers. By the EOD all the data stored in A1,A2 and A3 to be stored in A.

For above scenario, developer develops one mapping with one logical Schema , 3 Physical Schema (A1,A2 and A3)and 3 Context (A1_CTX,A2_CTX and A3_CTX) .

While executing the mapping if he selects A1_CTX it loads to A1. (i.e., Logical_schema+A1_CTX = A1… ) . That means we can reuse same code to pick data from different schema’s.

Q51. What is an Agent and different types of Agents?

Ans:

The run-time component known as ODI agent coordinates the data integration process.

They are three types of Agents:

Standalone Agent – Light Weight

J2EE Agent – High Availability , Scalability, Security and better manageability

Co-located Standalone Agent – Combination both standalone and J2EE agent

Q52. What is Context and it’s purpose?

Ans:

Contexts bring together components of the physical architecture (the real Architecture) of the information system with components of the Oracle Data Integrator logical architecture (the Architecture on which the user works).

For example, contexts may correspond to different execution environments (Development, Test and Production) or different execution locations (Boston Site, New-York Site, and so forth.) where similar physical resource exist.

Q53. What is an interface/Mapping?

Ans:

Mappings are the logical and physical organization of your data sources, targets, and the transformations through which the data flows from source to target.

We can create and manage mappings using the mapping editor, a new feature of ODI 12c.

Q54. What is a variable and different types of variables?

Ans:

A variable is an object that stores a single value. This value could be a date, a number, or a string. The variable value is stored in Oracle Data Integrator. It can be used in numerous places and have its value updated during run-time in your projects.

Refresh Variable

Set Variable

Declare Variable

Incremental Variable

Evaluation Variable

Q55. What is knowledge module and different types of KM’s?

Ans:

Knowledge Modules (KMs) are code templates. Each KM in the overall data integration process is focused on a specific task.

Types of KM’s:

LKM – Loads heterogeneous data to staging area

IKM – Integrate Data from staging area to target area

RKM – Retrieves metadata to Oracle Data Integrator work repository

SKM – Generates Data Manipulates web services

CKM – Checks the constraints

JKM – Used for CDC (Change Data Capture)

Q56. Different types of Reverse Engineering?

Ans:

Two types of Reverse Engineering:

Standard Reverse Engineering

Customized Reverse Engineering

Q57. What is scenario?

Ans:

The scenario code (the language generated) is fixed, and any further changes to the elements that went into its creation will have no effect on it.

Q58. What is difference between scenario and package?

Ans:

Scenario is froze code we can’t do any modifications

Q59. What is Load Plan and different types of Load Plans?.

Ans:

An executable object in Oracle Data Integrator called a load plan can have a hierarchy of steps that can be carried out sequentially, concurrently, or conditionally.

Types of Load Plans:

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ODI stands for Oracle Data Integrator. It differs from other ETL tools in that it employs an E-LT approach rather than an ETL approach. With this strategy, the exclusive Transformation Server between the Source and Target Data Server is no longer required. The target data server’s power can be utilized to transform the data. i. e. In addition to serving as the target database, the target data server also serves as a staging area.

A group of datastores corresponding to views and tables in an Oracle Schema make up an Oracle Model. A model is always based on a Logical Schema. The Physical Schema corresponds to the Logical Schema in a specific Context. The Oracle model tables and views are contained in this Physical Schema’s Data Schema.

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FAQ

What are the components of ODI?

• Repositories.
• ODI Studio and User Interfaces.
• Design-time Projects.
• Run-time Agent.
• ODI Console.
• Oracle Enterprise Manager Fusion Middleware Control.
• Management Pack for Oracle Data Integrator.

What are ODI scenarios?

Several ODI objects, including packages, mappings, and procedures, can be used to create scenarios. By creating a scenario for an object, the code for that object is assembled for deployment and use in a real-world setting.

Is ODI an ETL tool?

ODI-Tool for Serious Integration ODI has been a leader in ETL tools for years, but its traditional JAVA-based interface still feels painfully slow and dated.

What is the use solutions in ODI?

Based on an Extract, Load, and Transform (ELT) architecture, ODI provides a high-performance level to carry out the data validation and transformation process. It also provides the most cost-effective solution. Projects involving the integration of data and applications are streamlined by ODI’s unified infrastructure.