- How to find the number of rows in a DB2 table? …
- How can the duplicate values be eliminated from DB2 SELECT? …
- What is Aggregate? …
- Is it possible using MAX on a CHAR column? …
- Why SELECT is not preferred in Embedded SQL programs? …
- When is the LIKE statement used? …
- How is the value function used?
Here is the list of interview questions that I have collected from people who attended for interviews. These are useful for your next interview.
A). Installation is the process of preparing DB2 to operate as a z/OS subsystem. Migration is the process of upgrading to a more current release of DB2. Both processes require the same steps.
A). At installation time you supply values for the DB2 DSNZPARM parameters via the install panels.
A). DB2 utilities either execute within the subsystem (online) or standalone and run outside the subsystem (offline)
A). The catalog comprises several DB2 tables and can be accessed via SQL. The catalog contains details about DB2 objects obtained from the DDL (Data Definition Language) when an object is created or altered or from DCL (Data Control Language) when an authorization is granted on an object or a group of objects.
A). The DB2 directory is used to store information about the operation and housekeeping of the DB2 environment. This directory, unlike the DB2 catalog, cannot be accessed by using SQL. DB2 directory contains information required to start DB2 activities and utilities in the DB2 environment do the updating and deleting of table entries in the DB2 directory.
The Role of DBA is critical. Their responsibilities include to look after database performance, oversee production issues and coordinate with developers.
DB2 Interview questions and answers
What is the difference between UNION and UNION ALL?
An interviewer may ask this to determine how well you know these two operators and how they differ. Be sure to explain what they do in order to highlight their differences.
Example: “Whereas UNION eliminates duplicates, UNION ALL retains them.”
What is DB2 and what is its use?
When you respond, provide a clear and concise answer that showcases your knowledge of this data management software. Its also helpful to state the function of DB2.
Example: “DB2 is a database management system thats used to store, analyze and retrieve data.”
1 How is the LIKE statement used?
You might be asked this question to determine your knowledge of searches within DB2. Be sure that you don’t confuse the LIKE statements with other statements in the software.
Example: “The LIKE statement can be used to perform partial searches.”
26.) Mention a credible reason why SELECT* is never given preference in an SQL program that has been embedded.
The best way of putting a CURSOR to use in a COBOL program is to make use of DECLARE CURSOR, which can be used either in procedure division operation or in working storage. This is being done basically to highlight the SELECT statement. Once DECLARE CURSOR is used, this is followed by OPEN, FETCH and finally CLOSE.
The process that builds access paths to the DB2 table is known as bind. The bind uses Database Request Modules from the DB2 pre-compile step as input and produces an application plan. It checks for user authentication and validates SQL statements in the DBRM(s).
42.) Following a DB2 update statement, what is the quickest way to compute the total number of updated rows?
41.) In case if at some point of time DB2 is down, would that impact the pre-compilation process of a DB2-COBOL program?
Before you go! Take this “DB2 Interview Questions” interview guide with you
DB2 database is a very popular relational database. Many companies working around DB2 ask questions based on extensive knowledge of it in their interviews both from the freshers as well as from experienced candidates. In this article, we are going to learn about some of the most famous DB2 interview questions.
What is a Database?
A database is a collection of logically related (or simply inter-related) data. For example, a database of a school will contain data about the faculty members such as their name, Employee ID, Date of Joining, Leaves Taken so far in the current year, Classes which the teacher is teaching, and so on. It will also contain the data of students like the Enrollment Number of the student, name of the student, age and parent’s name, etc.
What is a Relational Database?
A relational database is such a database in which the data is arranged in the form of tables i.e. rows (known as tuples) and columns (known as attributes). For example, a student database, which shows the details of students in a school is shown below:
The above table is an example of a relational database where the data is arranged in the form of rows and columns. Some of the famous relational databases are MySQL, DB2, PostgreSQL, etc.
What is DB2?
DB2 in general is a family of data management products. It is developed by IBM. The AI-powered family of data management tools helps us in the management of both structured as well as unstructured data. The DB2 relational database is a relational database that is part of the DB2 family of data management tools.
So, now we are going to discuss the most important questions asked in interviews. We have divided the questions into two sections. The first section is going to be the basic section where we will discuss the questions that are basic in level and also have a high probability of appearing in the interviews for a fresher and the other section consists of advanced questions for experienced candidates. Crack your next tech interview with confidence! Take a free mock interview, get instant⚡️ feedback and recommendation
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FAQ
What is DB2 on LUW?
What are the 4 environments which can access DB2?
What is the meaning of <> in DB2?
What is the input to bind process?
