Cognizant Plsql Developer Interview Questions, Process, and Tips

Q1. What is performing tuning?
Ans. 
Performance tuning is the process of optimizing the performance of a system or application.
• Identifying and resolving performance bottlenecks

• Optimizing database queries and indexes

• Improving hardware and network configurations

• Reducing resource usage and improving response time

• Monitoring and analyzing system performance
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Q1. Explain stored procedure and PLSQL concept in detail?
Ans. 
Stored procedure is a precompiled program that is stored in a database and can be called by other programs.
• Stored procedures are used to encapsulate business logic and improve performance.

• PL/SQL is a procedural language used to write stored procedures in Oracle databases.

• Stored procedures can accept input parameters and return output parameters or result sets.

• They can also be used to enforce security and data integrity...read more
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Q1. Window Functions in SQL
Ans. 
Window functions in SQL are used to perform calculations across a set of table rows related to the current row.
• Window functions are used to calculate values based on a set of rows related to the current row.

• They allow you to perform calculations without grouping the rows into a single output row.

• Examples of window functions include ROW_NUMBER(), RANK(), and LAG().
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Q1. Uses of Packages in PL/SQL
Ans. 
Packages in PL/SQL are used to group related procedures, functions, variables, and other PL/SQL constructs together for better organization and security.
• Packages help in modularizing code for easier maintenance and debugging

• They provide encapsulation and hide implementation details

• Packages can contain multiple procedures, functions, variables, cursors, and exceptions

• They improve performance by reducing network traffic

• E...read more
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Oracle pl sql developer

Q1. Factorial of a number
Ans. 
Factorial of a number is the product of all positive integers up to that number.
• To calculate factorial of a number, multiply all positive integers up to that number.

• Factorial of 0 is 1.

• Example: Factorial of 5 is 5*4*3*2*1 = 120.
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Q2. Sql queries including 2nd highest salary and table joins
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Q1. Sql question and table joins
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Q2. Modelling of schema
Ans. 
Modelling of schema involves designing the structure of a database to organize and represent data.
• Identify entities and their relationships

• Define attributes for each entity

• Establish primary and foreign keys

• Normalize the schema to reduce redundancy

• Consider performance and scalability
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