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DB2 is a Database Management System for the MVS Operating System Top 50 DB2 Interview Questions & Answers .. Download PDF. Here are top 34 objective type sample DB2 Interview questions and their answers are given just below to them. These sample questions are framed by experts. DB2 INTERVIEW QUESTIONS AND ANSWERS MAINFRAME Interview Questions faqs DB2 ibm db2 sql interview questions and answers.
What is a clustered index? DB2 is a subsystem of the MVS operating system. Some views are updateable e. While unloading huge amount of data from table. It is specified as a condition or criteria to ensure data integrity.
Question 8. Question 9. What Is A Base Table? A base table is a real table - a table that physically exists in that there are physical stored records. Question What Is A Buffer Pool?
A buffer pool is main storage that is reserved to satisfy the buffering requirements for one or more tablespaces or indexes, and is made up of either 4K or 32K pages. There are four buffer pools: CLOSE physically closes the tablespace when no one is working on the object.
DB2 release 2. What Is A Clustering Index? It is a type of index that 1 locates table rows and 2 determines how rows are grouped together in the tablespace.
What Will The Commit Accomplish? This then permits the data to be accessed by other units of work. What Is Meant By Concurrency?
Concurrency is what allows more than one DB2 application process to access the same data at essentially the same time. Problems may occur, such as lost updates, access to uncommitted data, and un-repeatable reads.
What Is Cursor Stability? Changed values are protected until this application reaches the commit point. As soon as a program moves from one row to another, other programs may read or the first row.
The Data Manager is a DB2 component that manager the physical databases. DBRMs are input to the bind process.
What Is A Data Page? A data page is a unit of retrievable data, either 4K or 32K depending on how the table is defined , containing user or catalog information. What Is Declaration Generator dclgen?
These table or view descriptions are then used to check the validity of other SQL statements at precompile time. What Does Dsndb07 Database Do?
What Is A Host Variable?
This is a data item that is used in an SQL statement to receive a value or to supply a value. It must be preceded by a colon: This is the unit of storage within a table space or index space that is accessed by DB2.
What Is Pagespace? Pagespace refers to either to an unpartitioned table, to an index space, or to a single partition of a partitioned table of index space.
What Is A Predicate? A predicate is an element of a search condition that expresses or implies a comparison operation. Describe Its Characteristics. Where Are Plans Stored? This is a seven part value that consists of a date yymmdd and time hhmmss and microseconds.
This is a sequence of operations within a unit of work i.
What Is A Db2 Catalog? The DB2 catalog is a set of tables that contain information about all of the DB2 objects tables, views, plans etc. Included is the name of the database, the table space name, and the image copy type full or incremental etc.
It is a data structure that must be included in any host-language program using SQL. It is used to pass feedback about the sql operations to the program. Fields are return codes, error messages, handling codes and warnings. It directs DB2 to extract data from rows where the value of the column is the same as the current value of the host variable. What Is A Foreign Key? It identifies a releated row in another table and establishes a logical relationship between rows in two tables.
The Join statement combines data from more that two tables. What Are The Max. At pre-compile time, the table or view descriptions are then used to check the validity of SQL statements. Clustering index is a type of index, which locates the table rows and determines how to group the rows together in the tablespace.
More than one DB2 application process can access the same data at the same time, is known as concurrency. However, problems can happen such as, lost updates access to unrepeatable reads and uncommitted data.
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 capable of retrieving data from the database. The database from which the data can be retrieved is in the form of 4 kilobytes or 32 kilobytes.
The form in which data is retrieved depends on the way the table is defined inside the database. Data page also contains information regarding the catalog or user that are part of the database.
This should also be matched with plan ID. How can tablespace be moved to another DASD volume that is allocated for that tablespace? This is the table that contains information on the links that exists between the tables created through referential constraints.
Buffer manager can be considered as the component inside DB2 that helps in transferring data between virtual as well as external medium. While unloading huge amount of data from table. Suddenly job failed some error. Whether do i need to start from top or anything? How can you validate Sql errors during cursor operation in db2 pgms and where do you code? DB2 Interview Questions.
Questions Answers Views Company eMail. What is buffrpool? Where we use it? Tesco , 2