Special OFFER: 1st Enroll Flat 25% OFF OR 2nd Enroll Get 40% OFF | Use Coupon JTOFFER25
Interview- Those dreadful minutes of interaction that can make or break your career. Many times, it is seen that the candidates are really good and talented, but they experience interview anxiety. You can control this anxiety by preparing well for your interview. To prepare well for your interview, you need to take a good glance at what kind of questions are asked for the job role that you are applying for.
Today in this blog, we have collated a list of the most frequently asked questions for interviews that require a sound knowledge of DB2 related concepts and principles. The blog covers db2 mainframe interview questions and answers for experienced as well as entry-level candidates or freshers you can say. These DB2 mainframe interview questions will let you know about Subselect, Inner and Outer join, GroupBy, OrderBy, etc. DB2 questions have been written to get you acquainted with SQL databases.
Let’s get straight into DB2 questions and answers.
DB2 is a popular Database Management System used for the MVS Operating System where the DB2 is a subsystem of the MVS Operating System.
DB2 is an enormous relational database, the board framework with numerous segments in it. The four noteworthy segments of DB2 are:
The information changes can be caused perpetual by utilizing To submit. It likewise allows information to be gotten to by different applications that can reference the submitted information.
It is an information structure that must be incorporated into any host-language program utilizing SQL. It is utilized to pass criticism about the SQL activities to the program. Fields are return codes, blunder messages, taking care of codes, and warnings.
SQL Communication Area is a structure of factors, which are refreshed after each execution of SQL explanations. For an application that contains executable SQL proclamations, only one SQLCA is required. FORTRAN needs more than one SQLCA to be given. For Java, SQLCA isn't pertinent.
SQLCODE, SQLERRM, SQLERRD
The procedure that assembles get to ways to the DB2 table is known as the bind. The quandary utilizes Database Request Modules from the DB2 pre-arrange venture as information and produces an application plan. It checks for client confirmation and approves SQL explanations in the DBRM(s). DB2 bind procedure does the accompanying-
More than one DB2 application procedure can get similar information in the meantime, known as simultaneousness. Be that as it may, issues can happen; for example, lost updates access to unrepeatable reads and uncertain information.
Information chief can be considered as a part that is fit for dealing with the databases that are physically present and is equipped for conjuring different segments related to the framework for performing functionalities like logging, securing, and performing other I/O operations.
DBRM stands for Database Request Module and is a component inside DB2, which is created by the precompiler of DB2. This is a module that consists of SQL source statements that get extracted out of the application program. DBRMs form inputs that are helpful in the binding process.
Data page can be considered as a unit that is fit for recovering information from the database. The database from which the information can be recovered is as 4 kilobytes or 32 kilobytes. The structure wherein information is recovered relies upon how the table is characterized inside the database. The information page likewise contains data in regards to the index or client that are a piece of the database.
RCT is extended as a Resource–Control Table and is characterized in the DB2/CICS district. This is the part that includes highlights that are assembled through macros of DSNCRCT. RCT matches with the exchange ID that of CICS, with the approval ID that of DB2. This ought to likewise be coordinated with plan ID.
The tablespace that you are utilizing is distributed distinctly to STOGROUP, at that point you can enter the direction ALTER STOGROUP for including just as erasing volume. REORG TABLESPACE and RECOVER TABLESPACE are articulations that are useful in making new STOGROUP that can point towards the new volume. Adjust tablespace and REORG, and RECOVER are proclamations utilized for modifying and recuperating the tablespace dispensed in the memory.
The following are the points of interest connected to a PACKAGE.
The ideal method for putting a CURSOR to use in a COBOL program is to utilize DECLARE CURSOR, which can be utilized either in system division activity or in working stockpiling. This is being done fundamentally to feature the SELECT articulation. Once DECLARE CURSOR is utilized, this is trailed by OPEN, FETCH lastly CLOSE.
It is cursor stability that "tells" DB2 that database esteems pursued by this application are secured just while they are being utilized. (Changed qualities are secured until this application comes to the submit point). When a program moves to start with one line then onto the next, different projects may peruse or the main column.
It isn't required to bring DCLGEN into utilization. The essential utilization of DCLGEN comes during the pre-arrangement stage, where it helps in identifying the incorrectly spelled section names. Since DCLGEN is only an apparatus, it will just create variable definitions for the host and decrease the odds of mistakes.
Regardless of whether DB2 is down sooner or later of time, and still, at the end of the day, it won't affect the pre-gathering procedure of DB2-COBOL program. The purpose behind the equivalent is that the pre-compiler never alludes to the inventory tables of DB2.
DBRM indicates DataBase Request Module. It has the SQL explanations that are removed from the host language program gotten by the pre-compiler. PLAN is the consequence of the BIND procedure and has executable code for SQL statements in DBRM.
The buffer manager is the DB2 segment in charge of physically moving information between an outer medium and (virtual) stockpiling (plays out the genuine I/O activities). It limits the measure of physical I/O really performed with complex buffering techniques (i.e., read-ahead buffering and look-aside buffering).
Locks assume a crucial job in keeping up the simultaneousness in the DB2 condition. The following are the dispute circumstances brought about by Locks, which can corrupt the DB2 execution.
A NULL worth takes up one byte of capacity and shows that worth is absent instead of space or zero worth. It's what might be compared to TBD on an authoritative outline and regularly effectively depicts a business circumstance. Sadly, it requires additional coding for an application program to deal with this circumstance
The table and its view are re-built from scratch, but the programs that are accessing the view do not have to be altered in case the view and attributes that have been accessed remaining the same.
Never does DB2 allow such a thing. Such dispensation could yield more duplicate values after violating entity integrity. The Primary keys in DB2 must, in all cases, be updated one at a time only.
In the db2 precompilation process where Db2 precompiler scans the program & copies all the SQL statements & hosts variable data into database request module (DBRM). The precompiler also returns the modified source code so that SQL statements aren’t causing any errors when the program is compiled.
These are some of the most frequently asked questions in a DB2 interview. The DB2 interview questions and answers will let you understand the executable codes or SQL Server queries to let you know how confident you are for the interview. The DB2 interview questions are framed by JanBask experts who give training to IT industrialists. You really need to pay good attention to the answers to these questions. Do read the list thoroughly before your interview. Good Luck!
People Also Read:
A dynamic, highly professional, and a global online training course provider committed to propelling the next generation of technology learners with a whole new way of training experience.
MS SQL Server
Receive Latest Materials and Offers on SQL Server Course