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1. What is DB2?

DB2 is a relational database based on the principle of relation, which can be between rows and columns or tables.

It follows the principle of RDBMS, a relational database management system. DB2 is a product of IBM and mostly runs on IBM mainframes or AS400.

It can be downloaded and installed in local P C, but this course primarily focuses on IBM mainframes.

2. What is the primary process in a DB2 architecture?

The primary process in a DB2 architecture is the db2sysc, the primary system controller.

3. What is the DB2 TCPCM process?

The DB2 TCPCM process is a TCP listener that handles external and local connections.

4. What is the protocol DB2 ACR handled by?

The protocol DB2 ACR handles health monitoring and scheduling tasks.

5. What is the DB2 watchdog process?

The DB2 watchdog process is present in Unix and Linux only and starts the db2sysTCPCMprocess when the instance is created.

6. What is the DB2 check password process responsible for?

The DB2 check password process is responsible for authentication and authenticates the application when connecting to the database.

7. What is the process DB2 Bb?

The process DB2 Bb connects to the database using the APCM process.

8. What is the process DB2 A Fenced more?

The process DB2 A Fencedruns more stored procedures.

9. What are some critical processes in the P system?

Some critical processes in the P system include a log writer, log reader, file manager process, pre-features, page cleaners, dead log detectors, and self-tearing memory managers.

10. How can you list processor parameters in a DB2 system?

The command PSIFN can list processor parameters in a DB2 system.

11. How can you check processes at the database level in a DB2 system?

To check processes at the database level in a DB2 system, the command DB2pd type and EDUs are used.

12. How many power connections are required for every application connection from applicants to the databasein a DB2 system?

For every 100 connections, one DB2 agent is required in a DB2 system.

13. What are some required processes in a DB2 system?

Some required processes in a DB2 system include the db2sysc, DB2 TCPCM, DB2 ACR, DB2 check password process, DB2 agent for communication between the application and the database server, and the DB2 watch top process.

14. What is the DB2 ACD process?

The DB2 ACD process is part of the DB2 watchdog process and handles health monitoring and scheduling tasks.

15. How can you check the database processes in a DB2 system?

To check the database processes in a DB2 system, use the command DB2PD.

16. How can you start the database and application in a DB2 system?

To start the database and application in a DB2 system, create the instance first, then the database and the application.

The DB2 agent for communication between the application and the database server is started automatically.

17. What is the hierarchy of DB2?

The hierarchy of DB2 includes storage groups, which are sets of volumes on direct-access storage devices further divided into databases.

One storage group can contain multiple databases and storage groups.

18. What areVolume 1 and 2?

Volumes 1 and 2 are collections of visa datasets that can be divided into multiple databases, such as Storage Group One Two and Storage Group Three Four.

These databases are collections of tables and indexes, which can be compared using indexes.

19. What are tables in DB2?

Tables in DB2 are divided into rows and columns, each representing a record. Rows can be compared as one, two, or three, while columns are attributes, like employee or department names.

20. What operations can be performed on tables in DB2?

Operations on tables in DB2 include creating, selecting, inserting, updating, and deleting records.

21. What are the four types of operations in DB2?

The four types of operations in DB2 are Data Definition Language (DDL), Data Manipulation Language (DML), Data Control Language (DCL), and Data Validation Language (DVL).

22. What is DDL?

DDL stands for Data Definition Language and has three types of statements: create, alter, and drop. Create is used to create a table or view, Altar is used to change the properties of the table, and drop is used to lower the table or view.

23. What is DML?

DML is a data manipulation language with insert, update, delete, and select functions. Insert allows inserting records into a table, update updates based on a particular condition, and delete is a logical delete.

Select selects all columns from a table or view, or select a specific column or group of columns.

24. What is DCL?

DCL is a data control language that primarily uses grant and revoke operations to grant access to a specific area or table to a particular user or group of users.

DCL operations are not used directly in DBA but inside the application program.

25. What is the hierarchy of Volume 1 and 2?

The hierarchy of Volume 1 and 2 is based on a storage group at the top, which is divided into a database.

The database contains table space and index space, with indexes serving as pointers to data records.

26. What are the data types in Volume 1 and 2?

Data Types in Volume 1 and 2 Numeric, string, and date time. Numeric data types include integer, small, decimal, single floating point, and double floating point.

Other forms of numeric values exist, but they are less common in mainframe applications.

27. What is the purpose of using the like operator in a SQL query?

The like operator checks if a string pattern is present in a column.

28. What is the difference between care and wear care in Volumes 1 and 2?

Care and Wear Care in Volumes 1 and 2- Care and wear care are fixed-length characters that occupy four bytes, while date time has date, time, and time stamps.

29. What output file was created using QMF and SPUFIto create a store table and an item table in SQL?

Output File for Store and Item Tables – The output file is created using QMF and SPUFI, with a fixed block size and a block size.

The data types for the store table are integer, store name, character, length, and item received date.

The data types for the item table are small int, item name, price, total, and decimal.

30. What is the input file for creating a store table and an item table in SQL?

Input File for Store and Item Tables – The input file is a P S file with a fixed block size of 80 and a block size of 3120.

The output file is a variable block with a record length 409 and a block size 4096. The input file is named I, and the output file is named O.

31. What error message is encountered when the user tries to execute the SQL query to create a table on a defaultdatabase?

Error Message for SQL Query – The user encounters an error message that they do not have the privilege to operate.

32. How can the user resolve the error message to execute the SQL query to create a table on a default database?

Resolving Error Message for SQL Query – The user can give the database name, int and db01. The table space is allocated to DS.

The user then creates a table with various fields, the database name, and the table space name. The semicolon is added at the end of the statement.

33. What is the difference between variable and fixed blocks in SQL?

Variable Block vs. Fixed Block in SQL: A variable block has a record length that can vary, while a fixed block has a predetermined record length.

The block size can also vary depending on the data being stored.

34. What is the purpose of creating a view in SQL?

A view is a virtual table created in SQL that extracts data from one or multiple tables. It cannot be deleted if the main table is deleted.

35. What is the simplest form of database command to create a database in an SQL Server?

The most straightforward form of the database command to create a database in SQL Server is to create a database name.

36. What is the difference between a view and a table in SQL?

A view is a virtual table that extracts data from one or multiple tables, while a table is a physical table that stores data.

A view cannot be deleted if the main table is deleted, whereas a table can be deleted.

37. How does a user insert records into a table using SQL?

A user inserts records into a table using the INSERT INTO statement, specifying its name and a list of values for its columns.

38. How does a user retrieve a record from a table using SQL?

A user retrieves records from a table using the SELECT statement and specifies the table’s name and the columns they want to recover.

39. What are the conditions for inserting records into a table using SQL?

There are no specific conditions for inserting records into a table using SQL as long as the syntax is correct and the values are valid.

Insert fewer records using the INSERT intothe table name, list of values syntax, and insert values for specific columns.

40. How important is understanding SQL syntax for inserting records in different tables?

Understanding SQL syntax for inserting records in different tables is essential because it allows users to accurately and efficiently insert data into tables and manage their data effectively.

Overview of SQL syntax for insert operations, demonstrating the importance of understanding the syntax for inserting records in different tables.

41. What is the purpose of using the select C1 comma C2 function?

The select C1 comma C2 function retrieves specific columns from a table.

42. How can the select with condition checking function be used?

The select with condition checking function can be used by adding a where condition followed by relational operators to check a list of values.

43. What is the purpose of the GROUP BY function in SQL queries?

The GROUP BY function in SQL queries groups related records based on a particular column value.

44. What are the most common data types in DB2?

Most Common Data Types in DB2 – The most common data types in DB2 are integer, small and decimal, care, date, time, and time stamps.

These data types are used for smaller numbers, such as integers, while more significant numbers are defined as integers.

45. What syntax does the SQL query display records starting with ABC in the store name?

The syntax for the SQL query to display records starting with ABC in the store name is where it exists, and any other sub-query can be used.

46. How can I retrieve specific columns from a table?

To retrieve specific columns from a table, you can use the select C1 comma C2 function or the choose C1, C2, …, Cn function.

47. How can I check conditions in a table?

You can use the select with condition checking function by adding a where clause to your SQL query.

48. What are relational operators?

Relational operators compare values in a table and are usually placed after the where clause in an SQL query.

49. How can I perform a numeric check in a table?

You can use the between-columns method to check for values within a specified range or the operator and select a method to compare a specific string pattern.

50. How can I perform a non-numeric check in a table?

You can use the operator and select method for comparison of a string pattern or the like operator to check if at least one row of a record is present.

51. How can I retrieve records starting with a specific value in the store name?

You can use the LIKE operator in an SQL query to check if the store name starts with a specific value.

52. What is the use of the EXISTSoperator in SQL queries?

The EXISTS operator checks if at least one row of a record is present in a subquery.

53. What are EXISTS operator GROUP BY concepts and negation in relational databases?

The concepts of EXISTS, GROUP BY and negation are used in relational databases to check for the existence of specific values, group related records together based on a particular column value, and test whether a condition is proper.

54. Can you provide an example of how the EXISTSoperator is used in SQL queries?

An example of how the EXISTSoperator is used in SQL queries is to check the existence of a specific store in a table. The function SUMcan be used to check if the store balance is present in the table.

55. What is the purpose of using the in operator in a SQL query?

The in-operatorchecks if a list of values is in a column.

56. How is the GROUP BY function used in SQL queries?

The GROUP BY function is used in SQL queries to group related records based on a particular column value. If a specific store is in the table, the GROUP BY function can group associated records based on that value.

57. Can you explain how the GROUP BY function is used in SQL queries?

An example of how the GROUP BY function is used in SQL queries is to group results based on a particular column and perform any function on that data.

For example, if the store ID is 999,999, and the balance is two thousand and one thousand, the function “sum of store underscore balance” can be performed.

58. What is the purpose of the SUM function in SQL queries?

The SUM function in SQL queries calculates the sum of a particular column in a table.

59. How is the SUM function used in SQL queries?

The SUM function is used in SQL queries to calculate the sum of a particular column in a table. It can be used to check if a specific value is present in the table.

60. Can you provide an example of how the SUM function is used in SQL queries?

An example of how the SUM function is used in SQL queries is to check if the store balance is present in the table.

61. What are the different editions of DB2?

The different editions of DB2 are DB2 ESC, DB2 WGS, DB2 X-rays, and DB2 Express-C.

62. What are the features of each edition of DB2?

The features of each edition of DB2 vary depending on the price point, customer choices, and feature points.

63. What is the purpose of the DB2 system instance database?

The DB2 system instance database shows how the DB2 product fits with a physical server. It is used to manage hardware and software resources.

64. How does a user create a view in SQL?

A user creates a view in SQL using the CREATE VIEW statement, specifying the view’s name, and the SELECT statement, which extracts data from one or multiple tables.

65. How is the EXISTS operator used in SQL queries?

The EXISTSoperator can be used in a subquery to achieve the desired output. The syntax for this is where it exists, and any other subquery can be used.

66. How can I find all instances in the system?

Use the command prompt to list them. For example, to get the configuration for DB Two, use the command DB2 to list two instances.

67. What are the critical parameters for DB2?

Max connections, which are automatic and can grow based on system usage. Instance memory is also highly configurable.

68. What is the SQL-UPDATE file?

The SQL-UPDATE file is the system database directory containingessential files such as DB2 Dialogue, event log, STMM log, and SQL-UPDATE.

69. How do I attach myself to a newly created instance?

Use the “set instance name” command to specify the instance name, and then set the homepath /path/to/home/directory to determine the home directory path.

70. How do I drop an instance?

Use the command “drop instance name” to specify the instance name, and then use the command “delete profile instance name” to delete the instance profile.

71. What is the DB2 INST profile variable?

The DB2 INST profile variable tells us where the instance profile path is. It can be used to determine the location of the instance profile and the DB2 path variable.

72. What is the DB2 path variable?

The DB2 path variable points to the program file where the DB2 software is installed. It can be used to determine the location of the instance profile and the DB2 path variable.

73. What logical grouping is used to create a database in SQL Server?

Logical grouping is used to achieve this. It is a way of organising the databases under an instance.

74. What is the purpose of the database manager configuration file in DB2?

The database manager configuration file allows for flexible management of hardware and software resources in DB2.

75. What are the crucial parameters to look for when creating a database in SQL Server?

Essential parameters to look for when creating a database in SQL Server include the database name, alias name, and local database directory.

76. How is the table space grouped and managed in manual and automatic storage creation?

The table space is grouped into separate directories and can be manually managed.

When creating automatic storage, the creation command should specify the database path and one or more storage paths associated with it.

The system database directory shows where the database is located, while the dv path is critical.

77. What is required to create automatic storage, and how is it managed?

The creation command must be specified explicitly to create automatic storage.

The database manager manages the database path, local database directory, system database directory, and associated paths at the database level.

78. What is the difference between the local and database directory command lists?

The local database directory is in the D colon, not shown in the list D B directory command. To get the local database directory, one must backslash it with an e-colon.

79. What is the difference between the command that lists the database directory associated with the currentinstance and the command that lists two databases?

The difference is that the first command only gives the local database directory associated with that instance, which contains one database.

In contrast, the second command lists two databases, one under the folder db2 instance and another under the folder my INSD.

80. What does the system database directory contain regarding database storage?

The system database directory contains instance, node, and database folders. It holds the paths for the system database directory, local database directory, and database, which the database manager manages.

As previously discussed, DB2 interview question blogs provide candidates preparing db2 queries for interviews using this versatile database system with valuable tips and insight that can assist organisations of any size or industry realisetheir full potential for driving business growth and success.

These blogs can give candidates both fresher and experienced an advantage when interviewing by providing an in-depth knowledge of its features and functions.