Welcome to our ODI Interview Questions Blog! Oracle Data Integrator (ODI) is a powerful data integration platform that enables organizations to extract, transform, and load (ETL) data from various sources to target systems. As more and more businesses rely on data-driven insights to drive their operations, the demand for skilled ODI professionals has been on the rise.
If you are preparing for an ODI interview or looking to enhance your skills in this domain, this blog is the perfect resource for you. Here, we have compiled a list of frequently asked ODI Interview Questions along with their detailed answers, which will help you gain a deeper understanding of this tool and its applications.
Whether you are a beginner or an experienced professional, these questions will provide you with a comprehensive overview of ODI and its functionalities, enabling you to crack your interview with confidence. So, without further ado, let's dive into the world of ODI and learn everything you need to know to excel in your career!
In this article, we will cover the following:
Ans: Oracle acquired SUNOPSIS with its ETL tool called "Sunopsis Data Integrator" and renamed it to Oracle Data Integrator (ODI) is an E-LT (Extract, Load and Transform) tool used for high-speed data movement between disparate systems.
The latest version, Oracle Data Integrator Enterprise Edition (ODI-EE 12c) brings together "Oracle Data Integrator" and "Oracle Warehouse Builder" as separate components of a single product with a single licence.
Ans: ODI stands for Oracle Data Integrator. It is different from other ETL tools in a way that it uses the E-LT approach as opposed to the ETL approach. This approach eliminates the need for the exclusive Transformation Server between the Source and Target Data server. The power of the target data server can be used to transform the data. i.e. The target data server acts as a staging area in addition to its role as the target database.
While loading the data in the target database (from the staging area) the transformation logic is implemented. Also, the use of appropriate CKM (Check Knowledge Module) can be made while doing this to implement data quality requirements.
Ans: E-LT is an innovative approach to extracting, loading and Transforming data. Typically ETL application vendors have relied on costly heavyweight, mid-tier servers to perform the transformations required when moving large volumes of data around the enterprise.
ODI delivers unique next-generation, Extract Load and Transform (E-LT) technology that improves performance and reduces data integration costs, even across heterogeneous systems by pushing the processing required down to the typically large and powerful database servers already in place within the enterprise.
Ans: Oracle Data Integrator" comprises of:
Ans: ODI brings true heterogeneous connectivity out-of-the-box, it can connect natively to Oracle, Sybase, MS SQL Server, MySQL, LDAP, DB2, PostgreSQL, and Netezza.
It can also connect to any data source supporting JDBC, its possible even to use the Oracle BI Server as a data source using the JDBC driver that ships with BI Publisher
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Ans: Knowledge Modules form the basis of 'plug-ins' that allow ODI to generate the relevant execution code, across technologies, to perform tasks in one of six areas, the six types of knowledge modules consist of:
Ans: Yes, ODI is 'SOA' enabled and its web services can be used in 3 ways:
The Oracle Data Integrator Public Web Service, lets you execute a scenario (a published package) from a web service called Data Services, which provides a web service over an ODI data store (i.e. a table, view or other data source registered in ODI)
The ODIInvokeWebService tool that you can add to a package to request a response from a web service
Ans: ODI console is a web-based navigator to access the Designer, Operator and Topology components through a browser.
Ans: A load plan is a process to run or execute multiple scenarios as a Sequential or parallel or conditional-based execution of your scenarios. And same we can call three types of load plans, Sequential, parallel and Condition-based load plans.
Ans: A profile is a set of objective-wise privileges. we can assign these profiles to the users. Users will get the privileges from profile
Ans: Using the Yellow interface and sub-queries option we can create sub-queries in ODI. Using VIEW we can go for sub queries Or Using ODI Procedure we can call direct database queries in ODI.
Ans: Use DISTINCT at the IKM level. it will remove the duplicate rows while loading into the target.
Ans: Create two interfaces or one procedure and use two queries one for Unique values and one for duplicate values.
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Ans: Use Filters & Mapping Area AND Data Quality related to constraints using CKM flow control.
Ans: Exceptions In the packages advanced tab and load plan exception tab we can handle exceptions.
Ans: Make it a mail alert or check into SNP_SESS_LOg tables for session log details.
Ans: User this query on Command on target Delete from Target_table where not exists (Select 'X' From Source_table Where Source_table.ID=Target_table.ID).
If the Source has a total of 15 records with 2 records updated and 3 records newly inserted at the target side we have to load the newly changed and inserted records
Use IKM Incremental Update Knowledge Module for Both Insert n Update operations.
Ans: Yes, we can call one package into other packages.
Ans: Drag and drop both File and Table into the source area and join as in the Staging area.
If the source and target are Oracle technology tell me the process to achieve this requirement(interfaces, KMS, Models)
Use LKM-SQL to SQL or LKM-SQL to Oracle, IKM Oracle Incremental update or Control append.
Ans: File name with location: F and Schema :S this two parameters
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Ans: In Models Go to the Reverse engineering tab and select the Reverse engineering object as VIEW.
Ans:
Global
Project
A variable is an object that stores a single value. This value can be a string, a number or a date. The value is stored in Oracle Data Integrator and can be updated at run-time.
The value of a variable can be updated from the result of a query executed on a logical schema. For example, it can retrieve the current date and time from a database.
A variable can be created as a global variable or in a project. Global variables can be used in all projects, while project variables can only be used within the project in which they are defined.
Ans: Variables can be used in all Oracle Data Integrator expressions:
Ans: Variable Steps
| Declare Variable | When a variable is used in a Package (or in elements of the topology which are used in the Package), it is strongly recommended that you insert a Declare Variable step in the Package. This step explicitly declares the variable in the Package. |
| Refresh Variable | This step refreshes the variable by running the query specified in the variable definition. |
| Set Variable |
There are two functions for this step: 1. Assign sets the current value of a variable. 2. Increment increases or decreases a numeric value by the specified amount |
| Evaluate Variable | This step compares the value of the variable with a given value according to an operator. If the condition is met, then the evaluation step is true, otherwise, it is false. This step allows for branching in Packages. |
Ans:
Each work repository is attached to a master repository, therefore, information about the physical connection to a work repository is stored in the master repository it is attached to.
Defining a connection to a work repository consists of defining a connection to a master repository, and then selecting one of the work repositories attached to this master repository.
Ans: The Master Repository is a data structure containing information on the topology of a company's IT resources, on security and on version management of projects and data models. This repository is stored on a relational database accessible in client/server mode from the different modules.
Generally, only one master repository is necessary.
However, in exceptional circumstances, it may be necessary to create several master repositories in one of the following cases:
Project construction over several sites not linked by a high-speed network (off-site development, for example).
The necessity to clearly separate the interfaces' operating environments (development, test, production), including the database containing the master repository. This may be the case if these environments are on several sites.
Ans: A Procedure is a reusable component that allows you to group actions that do not fit in the Interface framework. (That is load a target datastore from one or more sources).
Ans: An Oracle Model is a set of data stores corresponding to views and tables contained in an Oracle Schema. A model is always based on a Logical Schema. In a given Context, the Logical Schema corresponds to a Physical Schema. The Data Schema of this Physical Schema contains the Oracle model's tables and views.
Ans: The package is the biggest execution unit in Oracle Data Integrator. A package is made of a sequence of steps organized in an execution diagram.
Ans: Oracle Data Integrator saves user parameters such as default directories, windows positions, etc. User parameters are saved in the userpref.xml file in /bin.
Ans: A project is a group of objects developed using Oracle Data Integrator.
Ans: Certain objects in a project are organized into folders and sub-folders.
Ans: An interface consists of a set of rules that define the loading of a Datastore or a temporary target structure from one or more source Datastores.
Ans: A sequence is a variable automatically incremented when used. Between two uses the value is persistent.
Ans: User functions enable you to define customized functions or "functions aliases", for which you will define technology-dependant implementations. They are usable in the interfaces and procedures.
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Ans: Elements of a project may be flagged in order to reflect the methodology or organization of the developments.
Flags are defined using markers. These markers are organized into groups and can be applied to most objects in a project.
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).
Ans: A sequence is a variable that increments itself each time it is used. Between two uses, the value can be stored in the repository or managed within an external RDBMS table.
Oracle Data Integrator supports two types of sequences:
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 that are made up of tasks.
Ans: The task is the smallest execution unit. It corresponds to a procedure command in a KM, a procedure, an assignment of a variable, etc
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