DB2 Questions for Interview

The maximum size of a CHAR data type in DB2 is 254 bytes. In IBM Db2, the maximum size of a CHAR data type is 254 bytes. CHAR is a fixed-length character data type, and it can store up to 254 bytes of character data. Keep in mind that the actual storage may be less … Read more

By applying the following query: SELECT COUNT(*) FROM TAB To count the number of rows from a table named TAB in IBM Db2, you can use the COUNT function in a SQL query. Here’s an example: SELECT COUNT(*) FROM TAB; This query will return the number of rows in the TAB table. The COUNT(*) function … Read more

A cursor can be declared either in Working Storage Section or in Procedure Division also. In a COBOL-DB2 program, you can declare a cursor in the Procedure Division, specifically within the Working-Storage Section or the Local-Storage Section. Cursors are typically declared in the Data Division, and they are used to retrieve and process rows from … Read more

DB2 performs auto rollback when a program is aborted in the middle of some transaction. When a program aborts in the middle of a transaction in IBM Db2, the database management system automatically rolls back the incomplete transaction. This means that any changes made to the database during the transaction are undone, and the database … Read more

Resource Control Table (RCT) is controller that directs the CICS DB2 interface. Using DSNCRCT, RCT can produce a micro table. In the context of IBM Db2, RCT typically stands for “Resource Control Table.” The Resource Control Table (RCT) is a system catalog table that is used by Db2 to manage and control various system resources. … Read more