DB2 Interview Questions and Answers
DB2 is a product developed by IBM.DB2 is the relational database management system(RDMS). DB2 is specially designed to store, analyze and retrieve the data efficiently. DB2 can handle a large amount of data and at the same time serving multiple users. The DB2 interview questions will be answered below in the article.
Advantages of DB2 database
- DB2 has a more powerful structured SQL query than Microsoft's SQL.
- DB2 has some useful features like Object tables, Java method support, and multiple user-defined functions
- IBM DB2 run on all the available platforms
If you are preparing for the db2 dba interview questions, we have one of the biggest collection of db2 interview questions.
Most Frequently Asked DB2 Interview Questions
A user can find the maximum value in a column by using SELECT MAX(...)..in DB2 query.
A buffer pool is the are of the main memory allocated by the data manager. It is expressly reserved to satisfy the buffering requirements for one or more tablespaces, or the indexes and Bufferpool is made up of either 4K or 32K pages.
- DB2 database is straightforward to use
- DB2 has a feature of automatic navigation in which the user only has to write their requirements and rest is done by DB2.
- DB2 us a very much interactive database due to which debugging or testing is done very quickly.
The UNION command eliminates the duplicates and the UNION ALL command retains the duplicates while combining the results of the different SELECT statements.
A cursor is a programming device which allows the SELECT statement to find a set of rows but it returns one row at a time, and the cursor plays a vital role because the host language needs only one row at a time.
There are three types of tables in the DB2 database:-
- Base Tables-These tables hold the persistent data
- Temporary Tables-These tables are used for the temporary work of the database operations
- Materialized Query Tables-These tables are used to increase the performance of queries
Point to be noted: Make sure that you go through this twice as this is the favorite db2 dba interview questions for fresher and experienced as well.
There are six types of base tables in the DB2 database:-
- Regular Tables: General purpose tables and Common tables with the indexes are known as the general purpose tables.
- Multidimensional Clustering Table (MDC): This type of table is used to maintain large database environments.
- Insert time clustering Table (ITC): They can be partitioned tables.
- Range-Clustered tables Table (RCT): This type of table provides fast and direct access to data.
- Partitioned Tables: These type of tables are used in the data organization schema where the table data is divided into multiple storage objects.
- Temporal Tables: History of a table in a database is stored in a temporary table like the details of the modifications done previously.
db2 create table <schema_name>.<table_name> (column_name column_type....) in <tablespace_name>
db2 describe table TABLE_NAME
The log files consist of the error logs, which are used to recover from the application errors. The logs keep the record of changes that happened in the database.
Development History
IBM Db2 which was announced in the year 2017 is the successor name to the DB2 that was introduced in the1980s by IBM only for their specific platform. In 1990 IBM decided to design a Universal Database (UDB) DB2 server that can run on any operating systems like Linux, UNIX, and Windows.
Latest Version
The newest version for IBM DB2 is 10.5, and the name of this version is “Kepler.”