Code and Theory Software Engineer Interview Questions and Answers for Experienced

Plan Bind is a feature in Oracle database that allows binding of execution plans to SQL statements.

• Plan Bind helps in improving the performance of SQL statements by reusing the execution plan.

• It reduces the overhead of parsing and optimizing the SQL statement every time it is executed.

• Plan Bind is enabled by default in Oracle database.

• It can be disabled using the initialization parameter OPTIMIZER_FEATURES_ENABLE.

• Plan ...read more

To copy data of all GDG versions into a single PS file using JCL.

• Use IDCAMS utility to define a temporary GDG base.

• Use SORT utility to merge all the GDG versions into a single file.

• Use IEBGENER utility to copy the merged file to a PS file.

• Delete the temporary GDG base using IDCAMS utility.

Isolation levels in Db2 determine how transactions interact with each other.

• Isolation levels include Read Uncommitted, Read Committed, Repeatable Read, and Serializable.

• Higher isolation levels provide more consistency but can also lead to more contention and slower performance.

• Isolation levels can be set at the transaction level or for individual queries.

• For example, a transaction with Repeatable Read isolation level w...read more

Cond parameter is used to conditionally render elements in React.

• It is a ternary operator that takes three arguments.

• The first argument is the condition to be evaluated.

• The second argument is the element to be rendered if the condition is true.

• The third argument is the element to be rendered if the condition is false.

• It can be used to render different elements based on the state of the component.

If else can be used in JCL to conditionally execute steps based on certain criteria.

• IF statement can be used to check for a condition and execute a step or skip it

• ELSE statement can be used to execute a different step if the condition is not met

• Examples include checking for file existence or job completion status

Index and subscript are used in COBOL to access elements in arrays.

• Index is used to access a specific element in an array based on its position

• Subscript is used to access a specific element in an array based on its value

• Both index and subscript can be used interchangeably in COBOL

• Example: ARRAY(3) is the same as ARRAY(3:3)